So glad you posted this. I was always curious how they flew. I remember seeing their Cessna Centurion flying back in the 70's. that one flew reasonably well for a 2 channel. Never seen their PT-19 fly before though. Someone already mentioned it, but your model is definitely tail heavy.
I found A Cox PT 19 used in a Sacramento hobby shop ,Very used! Offered $40.oo & took it home. I flew that thing for two years before I wrecked it beyond repair.I believe it had a Queen Bee 049,same/same Baby Bee with bigger tank (5 mins++). I don't know what your problem is,maby density altitude? Do you live in Denver or above 5000 MSL? I flew with an extra servo for throttle (Cox exhaust restricter) & was doing touch & go's .I WAS close to sea level.
I live at 1212 feet. Another guy that knows models well said .049 was not enough and put OS .10 in it, also that it was so tail heavy. The landing gear weighs 4 ounces, got mine flying with gear off, TD .049, and washout. th-cam.com/video/AT4vr9CcrBk/w-d-xo.htmlsi=1Bwp0fwTmfuKBPCp
My'n may have been a later improved model with windshields & finer details & lighter gear,I installed the radios/servos as far fwd as I could .All my models are balanced @ 30% This was in the 70's with a 225 nicad battery.RC gear was pretty heavy in those days. It was no hot rod, but flew pretty well .@@billkuhl442
Always been interested in this plane, but the few that I've seen for sale were offered at very high prices. Do you have an extra .09 engine on hand? That might get it of the ground and up into the air a little more reasonably.
It sounds over propped. A 5X3 prop with 25% nitro is what you want. Search for 1/2A fuel online. You need at least 20% oil with at least half of it castor. The 5X3 will give you way more power than a larger or more pitched prop. For best power, rework the engine mounts and put in a TD .049. Way more power then the reed valve motor you have. Runs better, too.
I did put a TD in it and used a TD. Half castor and synthetic will ruin the engine is my experience, I use all castor. 5x3 prop did not pull the plane as well as 6x3 so big and heavy.
Did you build this model? The fuselage looks as if it was made out of foam. My dream as a boy: put radio control gear into my Cox PT-19. A little washout at the wing tips would definitely help. 👍
When you took the spring and muffler off, you altered the CG. It is stalling. Amusing that this produces a Dutch roll. Then the loose rudder dumps it on takeoff.
@@billkuhl442 maybe clean that engine out and see if it runs better. A TD 051 maybe to much for it. I remember building a Q Tee and I put a TD049 in it. It was a screamer for sure!
Cox motors should scream hard to say why this one isn't. Maybe: prop's too big, fuel blockage, leaky crankcase gasket, general wear or not enough nitro in the fuel. Giving the engine a good clean, especially the spraybar and anything else to do with the fuel system, is always a good idea. Another good cure all for small glow engines is to bump up the nitro content. They should probably have at least 5 or 10% nitromethane in their fuel but if worn anything up to 25, 30% or more might be necessary.
So glad you posted this. I was always curious how they flew. I remember seeing their Cessna Centurion flying back in the 70's. that one flew reasonably well for a 2 channel. Never seen their PT-19 fly before though. Someone already mentioned it, but your model is definitely tail heavy.
Wow this brought back memories
049's did not like cold. They needed a crazy amount of nitro as I recall.
When I was a kid, I wanted one of those.
There were much better planes, the control line PT19 while heavy still flew well for beginners.
I had the control line version of this. The engine wasn't powerful enough to fly for some reason
I found A Cox PT 19 used in a Sacramento hobby shop ,Very used! Offered $40.oo & took it home. I flew that thing for two years before I wrecked it beyond repair.I believe it had a Queen Bee 049,same/same Baby Bee with bigger tank (5 mins++). I don't know what your problem is,maby density
altitude? Do you live in Denver or above 5000 MSL? I flew with an extra servo for throttle (Cox exhaust restricter) & was doing touch & go's .I WAS close to sea level.
I live at 1212 feet. Another guy that knows models well said .049 was not enough and put OS .10 in it, also that it was so tail heavy. The landing gear weighs 4 ounces, got mine flying with gear off, TD .049, and washout. th-cam.com/video/AT4vr9CcrBk/w-d-xo.htmlsi=1Bwp0fwTmfuKBPCp
My'n may have been a later improved model with windshields & finer details & lighter gear,I installed the radios/servos as far fwd as I could .All my models are balanced @ 30% This was in the 70's with a 225 nicad battery.RC gear was pretty heavy in those days. It was no hot rod, but flew pretty well .@@billkuhl442
Can try a Kamtechnik Turbo plug head adapter or use only 1 head shim with that low compression standard glow plug adapter. Best wishes.
Always been interested in this plane, but the few that I've seen for sale were offered at very high prices. Do you have an extra .09 engine on hand? That might get it of the ground and up into the air a little more reasonably.
th-cam.com/video/AT4vr9CcrBk/w-d-xo.htmlsi=Qv8W-7x0eH1KABfy TD .049 flew it
I had the control line one of those! It was my first one! It was a hard full!
I just received one of those and got it flying. It was pretty heavy but flies around level fine.
I would hand launch it into headwind after the carb is properly leaned fir peak rpm..a Kamtechnik head would definitely help boost engine output.
Reminiscent of trying to learn to fly Cox plastic in the very early 70s. But I kept trying.
PT 19 control line i much better than this.
It sounds over propped. A 5X3 prop with 25% nitro is what you want. Search for 1/2A fuel online. You need at least 20% oil with at least half of it castor. The 5X3 will give you way more power than a larger or more pitched prop. For best power, rework the engine mounts and put in a TD .049. Way more power then the reed valve motor you have. Runs better, too.
I did put a TD in it and used a TD. Half castor and synthetic will ruin the engine is my experience, I use all castor. 5x3 prop did not pull the plane as well as 6x3 so big and heavy.
Did you build this model? The fuselage looks as if it was made out of foam. My dream as a boy: put radio control gear into my Cox PT-19. A little washout at the wing tips would definitely help. 👍
It was an ARF from Cox. The wing is a heavy density foam and the wheels are heavy.
When you took the spring and muffler off, you altered the CG. It is stalling. Amusing that this produces a Dutch roll. Then the loose rudder dumps it on takeoff.
I think too CG needs to be ahead. The plane is so heavy I am hesitant to add more weight but I will.
damn.. you dont even have that engine lean enough to produce any power. no wonder it wont get off the ground.
If I tried to lean it would quit, most likely not broke in.
Got one for Christmas and my dad crashed it
I crashed mine more times today but finally got it to fly with landing gear off and washout in the wing.
The engine is not making power. It should be screaming.
Yes it would need to be, putting TD on it for next try.
@@billkuhl442 maybe clean that engine out and see if it runs better. A TD 051 maybe to much for it. I remember building a Q Tee and I put a TD049 in it. It was a screamer for sure!
@@johnmajane3731 I do not think the engine is broke in yet. As heavy as this plane is more power would be great.
@@billkuhl442 maybe not. I do remember as a kid having issues keeping them running. The TD series were much different and more reliable.
Cox motors should scream hard to say why this one isn't. Maybe: prop's too big, fuel blockage, leaky crankcase gasket, general wear or not enough nitro in the fuel. Giving the engine a good clean, especially the spraybar and anything else to do with the fuel system, is always a good idea. Another good cure all for small glow engines is to bump up the nitro content. They should probably have at least 5 or 10% nitromethane in their fuel but if worn anything up to 25, 30% or more might be necessary.