I have ron Williams free flight book signed. I used to work at aero craft rc in Riverhead NY. Ron used to come in all the time and shoot the shit with us. What a wonderful man he was.
@@joshuawfinn @joshuawfinn ok thats good to hear. I thought I heard unfortunate news. But I'm happy to be informed hes still around. Thanks for your response! Ive been in the hospital for the last 3 weeks due to a hit and run accident. Best news I've had since. Its good to see someone keeping this hobby alive! Your variable pitch prop is amazing i wish I had a place to fly these indoor works of art.
Hello, greetings from Argentina! your videos are very good I love indoor flight! You could do a slow turn variable pitch propeller assembly tutorial! There are many images but little information on how to build it! greetings and thank you very much!
@@joshuawfinn wow its trully amazing.. by the way i'm dheperson and i always watching your video you are one of my idol..number 1 fan here in the philippines.thankyou
@@joshuawfinn good day.. i making indoorplane but i dn't know where's cg? Can you pls give me some advice technique theory or idea how to get the cg and my airplane will fly nice and cool like you did.thankyou
Hi. I Saw some of your videos and I'm very interested to make a plane. But i can't find a very beginer tutorial to make a 1FD or similar very slow model. (7:20- is awesome. So cool). Thankyou for your videos
F1D isn't something to start out with. The techniques are pretty extreme. You'll want to get your feet wet with something simple like the kits are lasercutplanes.com, finishing with their Cents of Time pennyplane. Then start building from scratch using the information in 'The Best of INAV' at indoornewsandviews.com and then take a look at thef1dblog.wordpress.com where there is a complete tutorial on building an F1D.
Oh! Thankyou I'm not a absolutely beginner in RC Modeling (I've a EasyGlider from Multiplex) but I've no idea about F1D. The Mountail Lion looks fine but... is too fast. I'll buy it. Talking about other models... they have an special curve in their ribs (naca or similar) or only circular curve? Do you know a easy model (but more difficult and slower than Mountain Lion MK in INAV ??
+itubal I'd recommend looking through "The Best of INAV" and find the information on pennyplanes. Any one of the limited pennyplane plans in there will work. The Banks LPP in issue 137 is as good as any out there.
Hello, I really liked your plane and the way it flies. I thought that the planes had to be very small to fly inside the house, but with your video I realized that it is not so. Do you have any page or facebook with the tutorials to translate it into Spanish? Thank you for responding to your video.
Unfortunately I don't know of anything in Spanish. That said, if you go to indoornewsandviews.com and look at the Downloads section, you'll find many volumes of detailed information. Especially "The Best of INAV".
My website is devoted to providing those kits and parts. Additionally indoorffsupply.com has taken over production and marketing of the materials and tools previously available from Indoor Model Supply like precision cut wood, bearings, rubber and balsa strippers, etc.
Aditya Mahajan, until you're competing at a really high level, Tan Supersport from faimodelsupply.com will do everything you need and more. If you don't have a rubber stripper, order presized rubber from freedomflightmodels.com or Retro RC in their Scholastic section.
Is it possible to have different layers of friction that it can run through? As there’s less turns on the rubber band it goes to a different zone of friction then to no friction at all. Then that is when the variable pitch kicks in, some time after there is no friction, kind of like different gears in a transmission
Possible, yes, but quite inefficient. The goal of variable pitch is to transfer all the energy into the air as thrust, just in a delayed fashion. Friction just burns the energy off as heat.
I have been flying RC since the late sixties. I still fly single channel, but I have been very interested in F1D for several years. I just don't know anyone in the Southern California area to get with to learn. I just ordered the Cent of Time Penny Plane you recommended. I have no idea where I will be able to fly it around here though as all my flying is outdoors. You have an amazing amount of knowledge of this part of the model airplane hobby and you can impart the information as well as I have ever heard modelling being taught. Thanks for your videos.
thanks! You should be able to find a club that does indoor in SoCal. At minimum there is a group up in San Diego, but I'm pretty sure there is one in LA as well. I'd recommend looking through the club directory at freeflight.org and call up one of those groups to see what they know.
Josh, what makes the propeller spin so slow on an indoor plane as opposed to the outdoor FF planes? Those planes are so peaceful to watch. Thanks for sharing your passion.
It's all a matter prop propeller size to supplied torque at a given airspeed. F1D's and Mulvihills run similar sized propellers in that they move a similar amount of air for a given revolution. The difference is that the Mulvihill is running about 150 times the torque of the F1D, and so the prop runs about 10x faster (there's some quadratic math in there).
So what kind of torque, energy storage, and revolutions is this sort of set-up producing from a rubber band? Is there a possible application for larger and stronger bands to replace batteries? Just curious how this compares to the traditional powered flights in RC planes.
At this point, high end Lipo technology is the best energy source you can get for small models. For larger stuff, the ultimate energy density sources remain diesel/kerosene type fuels. I think the ultimate indoor endurance record for electric R/C is around 6 hours, as opposed to 1 hour for rubber power.
Yes, but you don't want static thrust, so the rig needs to be moving. The best way to do this is to build a "whirling arm" device which uses a drag plate to simulate the aerodynamic drag of the aircraft. You then measure thrust based on the number of revolutions the arm makes in a given period of time and use the turns and torque at the beginning and end of the test to determine the energy used to generate that thrust for the period of the test.
I would think if you had a push prop you could stand it on it's nose running on a digital scale , then just cancel out the weight and have your thrust measurement. if this theory works then you'd have to make a special rig to test prop and motor combos , but I'm pretty sure this would only give an idea of thrust and not an actual measurement.
You have to build them. I'm hoping to release a kit eventually, but at the moment that is not an option. Learn more about building them in the downloads section at indoornewandviews.com. Also look at the Senior Flyer build videos we released this week.
I haven't been able to figure out what airfoil arc percentage refers to. I am looking at salty dog plans and it has 3 percent arc on the wing, 2.5 percent arc on the stab and 3.5 percent arc on the propeller. How do I form this? Thank you!
A 3 percent arc airfoil is a circular arc subtended by a chord such that the maximum separation of the arc from the chord is 3 percent of the chord length. Given the chord length c and the maximum height h of the arc, we need to know the radius r of the circle. The radius is (c squared divided by 8h) plus h/2. You strike and arc of radius r from each end of the chord, the center of the circle is where two arcs intersect, you draw an arc from that center through the ends of the chord and that is your arc airfoil. There is also a simple geometrical construction. Draw the chord line. Draw the point of maximum camber 3% (or whatever you want) of the chord length above the center of the chord. Draw the bisectors of each of the line segments formed by this maximum point and each end point. Where those bisectors intersect is the center of the arc sought. Construct the bisectors by striking arcs of equal radius from each end of the line segment, the radius being somewhat longer than the line segment. The two points of intersection of these arcs determine the bisector line.
Dear sir thanks for sharing this video, I am very much impressed with your video, I am also hobby flyer and do teach aeromodelling in school from 6th level class to 10 the level, I request you please make video on assembling this model, this tutorial would be very helpful for us, and also request you please share the address where we can buy material for such kind of model , I do from India, Pune
Ayaz Ahmad, please contact me through the J&H Aerospace website and we'll work on getting you started. You don't want to begin with F1D. It is extremely different and used highly specialized materials. I'll send you some information on Pennyplane designs and you can get started on those and work your way up to your goal of an F1D.
I've been working to make your plane just like that i don't know why never fly how to make that kind of plane I think he need balance 😢 I make 10 plane but still not fly 😢
Master: hello, I am your loyal fans, I have focused on your video for two years. Admire you very much, very like your video technology. I come from faraway China, I hope I can become the friend with you. Can you leave the contact way of the twitter. ? Greetings from Chinese friends, the most sublime, are looking forward to your reply
The engineering in that propeller !!! Just amazing.
I have ron Williams free flight book signed. I used to work at aero craft rc in Riverhead NY. Ron used to come in all the time and shoot the shit with us. What a wonderful man he was.
Unless you've heard differently, Ron is still around. I've heard from him as recently as last year. Great guy working to grow indoor. :)
@@joshuawfinn @joshuawfinn ok thats good to hear. I thought I heard unfortunate news. But I'm happy to be informed hes still around. Thanks for your response! Ive been in the hospital for the last 3 weeks due to a hit and run accident. Best news I've had since. Its good to see someone keeping this hobby alive! Your variable pitch prop is amazing i wish I had a place to fly these indoor works of art.
This is so cool!
Terimakasi pak segala teori yg udah di tayangkan anda
Semoga ke beruntungan selalu di tagan anda
Hello, greetings from Argentina! your videos are very good I love indoor flight! You could do a slow turn variable pitch propeller assembly tutorial! There are many images but little information on how to build it! greetings and thank you very much!
I want have vpp. How to get it?
awesome just awesome man ive only been in free flight and already built 4 guillows stick and tissue models and love the hobby
Awesome! Glad to see another practitioner of our crazy hobby!
+joshuawfinn thanks keep up the great work!
@@joshuawfinn jajaja como lo hizo
Where can I buy this
jhaerospace.com/
How the propeller go slowly?? Thankyou..so cool
Very big, efficient propeller turned buy a very thin rubber motor on a lightweight airplane that requires very little thrust to stay airborne.
@@joshuawfinn wow its trully amazing.. by the way i'm dheperson and i always watching your video you are one of my idol..number 1 fan here in the philippines.thankyou
@@joshuawfinn good day.. i making indoorplane but i dn't know where's cg? Can you pls give me some advice technique theory or idea how to get the cg and my airplane will fly nice and cool like you did.thankyou
Hello, how would you make the flight as slow as possible given a limit on propeller diameter
Hi. I Saw some of your videos and I'm very interested to make a plane. But i can't find a very beginer tutorial to make a 1FD or similar very slow model. (7:20- is awesome. So cool). Thankyou for your videos
F1D isn't something to start out with. The techniques are pretty extreme. You'll want to get your feet wet with something simple like the kits are lasercutplanes.com, finishing with their Cents of Time pennyplane. Then start building from scratch using the information in 'The Best of INAV' at indoornewsandviews.com and then take a look at thef1dblog.wordpress.com where there is a complete tutorial on building an F1D.
Oh! Thankyou I'm not a absolutely beginner in RC Modeling (I've a EasyGlider from Multiplex) but I've no idea about F1D.
The Mountail Lion looks fine but... is too fast. I'll buy it.
Talking about other models... they have an special curve in their ribs (naca or similar) or only circular curve?
Do you know a easy model (but more difficult and slower than Mountain Lion MK in INAV ??
+itubal I'd recommend looking through "The Best of INAV" and find the information on pennyplanes. Any one of the limited pennyplane plans in there will work. The Banks LPP in issue 137 is as good as any out there.
Oh! Thankyou very very much! This model looks very fine. I like it!!
Класно летает !!!
Hello, I really liked your plane and the way it flies. I thought that the planes had to be very small to fly inside the house, but with your video I realized that it is not so. Do you have any page or facebook with the tutorials to translate it into Spanish? Thank you for responding to your video.
Unfortunately I don't know of anything in Spanish. That said, if you go to indoornewsandviews.com and look at the Downloads section, you'll find many volumes of detailed information. Especially "The Best of INAV".
@@joshuawfinn gracias
I used the build these as a kid.. where do you get the kits/parts?
My website is devoted to providing those kits and parts. Additionally indoorffsupply.com has taken over production and marketing of the materials and tools previously available from Indoor Model Supply like precision cut wood, bearings, rubber and balsa strippers, etc.
@@joshuawfinn Thank you very much. This really is an amazing hobby and am looking forward to getting back into it.
hello sir .... i want to know about the rubber band you are using, and it is possible to get that kind of rubber band online ...
Aditya Mahajan, until you're competing at a really high level, Tan Supersport from faimodelsupply.com will do everything you need and more. If you don't have a rubber stripper, order presized rubber from freedomflightmodels.com or Retro RC in their Scholastic section.
Is it possible to have different layers of friction that it can run through? As there’s less turns on the rubber band it goes to a different zone of friction then to no friction at all. Then that is when the variable pitch kicks in, some time after there is no friction, kind of like different gears in a transmission
Possible, yes, but quite inefficient. The goal of variable pitch is to transfer all the energy into the air as thrust, just in a delayed fashion. Friction just burns the energy off as heat.
Do you sell these ? I would like to have one.
I have been flying RC since the late sixties. I still fly single channel, but I have been very interested in F1D for several years. I just don't know anyone in the Southern California area to get with to learn. I just ordered the Cent of Time Penny Plane you recommended. I have no idea where I will be able to fly it around here though as all my flying is outdoors. You have an amazing amount of knowledge of this part of the model airplane hobby and you can impart the information as well as I have ever heard modelling being taught. Thanks for your videos.
thanks! You should be able to find a club that does indoor in SoCal. At minimum there is a group up in San Diego, but I'm pretty sure there is one in LA as well. I'd recommend looking through the club directory at freeflight.org and call up one of those groups to see what they know.
Olá, como consegue fazer a hélice virar de modo devagar???
Hi what rubber would you recommend for first time rubber airplane like the Guillows Lancer ?
Rolando Torrico two loops of 1/8" Tan Supersport from faimodelsupply.com will fly that airplane nicely.
Josh, what makes the propeller spin so slow on an indoor plane as opposed to the outdoor FF planes? Those planes are so peaceful to watch. Thanks for sharing your passion.
It's all a matter prop propeller size to supplied torque at a given airspeed. F1D's and Mulvihills run similar sized propellers in that they move a similar amount of air for a given revolution. The difference is that the Mulvihill is running about 150 times the torque of the F1D, and so the prop runs about 10x faster (there's some quadratic math in there).
Also, how do you make the propeller powering mechanism and the hub?
Very carefully. ;)We sell them at jhaerospace.com
So what kind of torque, energy storage, and revolutions is this sort of set-up producing from a rubber band? Is there a possible application for larger and stronger bands to replace batteries? Just curious how this compares to the traditional powered flights in RC planes.
At this point, high end Lipo technology is the best energy source you can get for small models. For larger stuff, the ultimate energy density sources remain diesel/kerosene type fuels. I think the ultimate indoor endurance record for electric R/C is around 6 hours, as opposed to 1 hour for rubber power.
Greeting Joshua, I would like to ask is there any way to measure the thrust produced by the propeller? Thanks!
Yes, but you don't want static thrust, so the rig needs to be moving. The best way to do this is to build a "whirling arm" device which uses a drag plate to simulate the aerodynamic drag of the aircraft. You then measure thrust based on the number of revolutions the arm makes in a given period of time and use the turns and torque at the beginning and end of the test to determine the energy used to generate that thrust for the period of the test.
Is there any instrument on sell that specifically used to measure the thrust?
I don't know of anything commercially available that would provide even remotely usable data.
Thanks, Joshua!
I would think if you had a push prop you could stand it on it's nose running on a digital scale , then just cancel out the weight and have your thrust measurement. if this theory works then you'd have to make a special rig to test prop and motor combos , but I'm pretty sure this would only give an idea of thrust and not an actual measurement.
how do you make it go so slow?
Big, efficient propeller on a super light airplane driven by relatively low torque.
How i can buy this plane?
You have to build them. I'm hoping to release a kit eventually, but at the moment that is not an option. Learn more about building them in the downloads section at indoornewandviews.com. Also look at the Senior Flyer build videos we released this week.
@@joshuawfinn thanks!
Beautiful.
I haven't been able to figure out what airfoil arc percentage refers to. I am looking at salty dog plans and it has 3 percent arc on the wing, 2.5 percent arc on the stab and 3.5 percent arc on the propeller. How do I form this? Thank you!
A 3 percent arc airfoil is a circular arc subtended by a chord such that the maximum separation of the arc from the chord is 3 percent of the chord length.
Given the chord length c and the maximum height h of the arc, we need to know the radius r of the circle. The radius is (c squared divided by 8h) plus h/2. You strike and arc of radius r from each end of the chord, the center of the circle is where two arcs intersect, you draw an arc from that center through the ends of the chord and that is your arc airfoil.
There is also a simple geometrical construction. Draw the chord line. Draw the point of maximum camber 3% (or whatever you want) of the chord length above the center of the chord. Draw the bisectors of each of the line segments formed by this maximum point and each end point. Where those bisectors intersect is the center of the arc sought. Construct the bisectors by striking arcs of equal radius from each end of the line segment, the radius being somewhat longer than the line segment. The two points of intersection of these arcs determine the bisector line.
Queria muito aprender Joshua estas técnicas de construção de planadores
The best I can do to help is to direct you to indoornewsandviews.com/downloads/ and this book: www.indoormodelairplanes.com/
I am really happy to see you dear Joshua I am big fan of you and your model airplanes my wish is I learn how to make rubberd power airplane
Hello, want to buy. How can I contact? I am in Guangzhou, China. I look forward to your reply, thank you!
jhaerospace.com/
نايس احب علم طيران👍😘
It's just great!
Dear sir thanks for sharing this video, I am very much impressed with your video, I am also hobby flyer and do teach aeromodelling in school from 6th level class to 10 the level, I request you please make video on assembling this model, this tutorial would be very helpful for us, and also request you please share the address where we can buy material for such kind of model , I do from India, Pune
I'm working toward some build videos on these but bear in mind that they are very intricate and fragile.
Nice
Сколько стоит интересно готовая модель?
Right now this is a scratch built-only airplane. Start your research at indoornewsandviews.com
how to make this plane at home
here is the use of rubber band if no so how you fly this plane please give me some trips so that i can also make this plane
Ayaz Ahmad, please contact me through the J&H Aerospace website and we'll work on getting you started. You don't want to begin with F1D. It is extremely different and used highly specialized materials. I'll send you some information on Pennyplane designs and you can get started on those and work your way up to your goal of an F1D.
Muito bacana
I subscribe , it's amazing,,,
I've been working to make your plane just like that i don't know why never fly how to make that kind of plane I think he need balance 😢 I make 10 plane but still not fly 😢
Which airplane are you trying to fly?
if you can use Indonesian text, sir.
I don't know any languages except English, I'm sorry.
It's amazing .... can you send one air plan this one
Hi Joshua, can you left me your email? I need your advice regarding this variable pitch propeller. Thanks!
you can shoot me an email through the contact form at jhaerospace.com
Yes audio not good. You can use Samson USB Mic G-Track www.samsontech.com/samson/products/microphones/usb-microphones/
Up
I thought the variable diameter was a good one also........after the reduction, the aircraft climbed once again....!
Ken Wiberg indeed! Future video topic for sure.
The prop is not balanced :)
The prop certainly is balanced ! the model is moving /swaying because of the torque reaction on the very light airframe,what a work of art this is.
Master: hello, I am your loyal fans, I have focused on your video for two years. Admire you very much, very like your video technology. I come from faraway China, I hope I can become the friend with you. Can you leave the contact way of the twitter. ? Greetings from Chinese friends, the most sublime, are looking forward to your reply
I don't use twitter, but you can email me through the contact form at jhaerospace.com
rgfri
Also, where do you get your polymicro film? thanks.
Mark Bennett, I get polymicro from indoorspecialties.com, but this model is covered in OS Film from hobbyspecialties.com