At last, an excellent video made by a really intelligent individual! Extremely useful. Many thanks for taking the time to make all this info available in such a clear, we constructed manner.
Great comparison video! I'm experiencing similar results with the Helix prop (9760 rpm at 600msl). Just ordered a 130 cm e-prop. Will post results here
I'm currently flying a Vittorazi moster 185 but I am only 150 lbs. I would love to try this motor because I'm 50 years old and it's getting really heavy. I refuse to go backwards and start using a trike. Also I fly sea Sea level at the beach. Thanks that was some fantastic information!
I would go with the E Prop. Faster climb rate is a plus, also the lower rpm’s might contribute to a longer engine life. The operational temperature is a little higher with the E Prop however It is still in the acceptable range.
Very informative. I have been using a carbon fiber 125cm prop for the last 3 years. I was thinking of stepping up to the 130cm size, and will probably go with the eprop. Do I need to add the prop spacer when stepping up to the larger size prop? Not really sure what the prop spacer does performance wise. It came with the unit, and I have never tried it.
Thanks! In theory, the prop spacer should increase efficiency by giving the prop better access to less disturbed air. However, in practice I doubt you'd see a measurable efficiency or max power difference. Most frames that require a spacer do so due to clearance issues with the cage. For example, according to Miniplane-USA, the Classic Miniplane frame has adequate space and doesn't require a spacer, whereas the New 2016 Miniplane frame does recommend the spacer for all props. If you're worried about prop clearance, I'd add the spacer. Another thing to consider is how the prop size might affect your ability to do power forwards. My Miniplane cage is flexible so I don't do power forwards, but if you have a more rigid cage, it likely still flexes a little bit under tension from the lines and if you go from say 5 cm clearance to 2.5 cm clearance, that might be enough to chew up your prop with your net. I'd recommend talking to someone with your frame/engine combination to see what their experience is with different sized props.
Wonder if you have any update on the Top80 and 130cm E-Prop combination, still the same combo? Have you tried flying a smaller wing with the same setup?
I switched from the Top 80 to the Atom 80 2 years ago, so no updates on the Top 80. I've flown both props on the Atom 80 (Atom-specific props, not the same as in this video) and the only difference is that the Helix is noticeably smoother, especially at high RPM. I think they're much more closely pitched to one another for the Atom than for the Top 80 which is why the two had a measurable performance difference on the Top 80 but really none on the Atom 80. If you're in the market for an 80cc engine, the Atom has been fantastic. Currently flying a 16m Viper 4 and have no problems with the small engine/small wing combination.
I can't say for sure, but if I had to guess it might have something to do with a greater load on the engine. Kind of like riding a bicycle in a higher gear ratio: you can pedal more slowly (the E-Prop's lower cruise and max RPM, in this analogy) but will have to exert more force on the pedal (corresponding to a higher CHT despite the lower RPM). On a propeller-cooled engine like the Moster, I think the prop planform could have a big effect on CHT, but the Top 80 is forced-air cooled by a fan and most of the cylinder is cowled with only small cooling-air exhaust vents at the back. Because of this, I suspect that any propeller cooling effect is minimal if existent. In fact, if you look at the planform of the E-Props vs the Helix, you'll notice that the E-Props actually has more of a traditional "cooling profile", but still gives a higher CHT.
Yes. Mine was etched on the redrive about 2" below my propeller shaft, although I've heard some of the older models are a little more difficult to find.
Yes, but depending on the type of flying you like you might want something more powerful. There are plenty of pros and cons to each engine, but I'm very happy with my Top 80. Check this out if you're worried about power: www.miniplane-usa.com/tips/yahoogroup.htm What are you flying currently?
It's weird. I have exactly the same propeller, e-props, 130cm, scimitar design, top80 19/73. The engine reaches 9600 rpm on the ground. I did not fly on it yet.
Weird indeed. Is this the only prop you've had on it, and if no, what was the previous propeller reading? I wonder if we have error between our tachs or if you're really outputting more power than me.
@@scottduncan2353 I checked with the second tachometer. Rotational speed is up to 9700 RPM, (9600-9700) measured on two revolutions, but the same company. I will try to get a completely different tachometer to confirm rpm. I live at 206m AMSL (675ft), temperature during test around 0 deg C. I still have a three-blade propeller, but it's adjustable so the measurement will not say anything. I'm starting to think that my propeller is less straining the engine. Can you read some signs from your propeller? (near the hub)
At last, an excellent video made by a really intelligent individual! Extremely useful. Many thanks for taking the time to make all this info available in such a clear, we constructed manner.
very good video. the precision is great. thanks!
Great comparison video! I'm experiencing similar results with the Helix prop (9760 rpm at 600msl). Just ordered a 130 cm e-prop. Will post results here
I bought an old generation replacement e-props for the Top 80, it ran slightly more RPM but the but felt like it had less thrust.
Very good review. Thank you.
I'm currently flying a Vittorazi moster 185 but I am only 150 lbs. I would love to try this motor because I'm 50 years old and it's getting really heavy. I refuse to go backwards and start using a trike. Also I fly sea Sea level at the beach. Thanks that was some fantastic information!
the most envy of this video is that field...omg.. i launch on dusty and rocky area...
Very good and informativ video.
Thank you.
I would go with the E Prop. Faster climb rate is a plus, also the lower rpm’s might contribute to a longer engine life. The operational temperature is a little higher with the E Prop however It is still in the acceptable range.
I think I am going to have to flip a quarter. Both seem to be great props.
Very informative. I have been using a carbon fiber 125cm prop for the last 3 years. I was thinking of stepping up to the 130cm size, and will probably go with the eprop. Do I need to add the prop spacer when stepping up to the larger size prop? Not really sure what the prop spacer does performance wise. It came with the unit, and I have never tried it.
Thanks! In theory, the prop spacer should increase efficiency by giving the prop better access to less disturbed air. However, in practice I doubt you'd see a measurable efficiency or max power difference. Most frames that require a spacer do so due to clearance issues with the cage. For example, according to Miniplane-USA, the Classic Miniplane frame has adequate space and doesn't require a spacer, whereas the New 2016 Miniplane frame does recommend the spacer for all props. If you're worried about prop clearance, I'd add the spacer. Another thing to consider is how the prop size might affect your ability to do power forwards. My Miniplane cage is flexible so I don't do power forwards, but if you have a more rigid cage, it likely still flexes a little bit under tension from the lines and if you go from say 5 cm clearance to 2.5 cm clearance, that might be enough to chew up your prop with your net. I'd recommend talking to someone with your frame/engine combination to see what their experience is with different sized props.
I am using R2 26. Looks like ur main brek combined with your tip steering ( 2D). Any tips or link how to do like yours. Tq
Wonder if you have any update on the Top80 and 130cm E-Prop combination, still the same combo? Have you tried flying a smaller wing with the same setup?
I switched from the Top 80 to the Atom 80 2 years ago, so no updates on the Top 80. I've flown both props on the Atom 80 (Atom-specific props, not the same as in this video) and the only difference is that the Helix is noticeably smoother, especially at high RPM. I think they're much more closely pitched to one another for the Atom than for the Top 80 which is why the two had a measurable performance difference on the Top 80 but really none on the Atom 80. If you're in the market for an 80cc engine, the Atom has been fantastic. Currently flying a 16m Viper 4 and have no problems with the small engine/small wing combination.
@@scottduncan2353 thanks for the reply. May i know your all up flying weight with fuel?
@@marcuschandrasegran8935 Typically about 105 +/- 5 kg
Why does the E Prop result in higher CHT? Assuming it's the planform of the prop drawing less air past the engine?
I can't say for sure, but if I had to guess it might have something to do with a greater load on the engine. Kind of like riding a bicycle in a higher gear ratio: you can pedal more slowly (the E-Prop's lower cruise and max RPM, in this analogy) but will have to exert more force on the pedal (corresponding to a higher CHT despite the lower RPM). On a propeller-cooled engine like the Moster, I think the prop planform could have a big effect on CHT, but the Top 80 is forced-air cooled by a fan and most of the cylinder is cowled with only small cooling-air exhaust vents at the back. Because of this, I suspect that any propeller cooling effect is minimal if existent. In fact, if you look at the planform of the E-Props vs the Helix, you'll notice that the E-Props actually has more of a traditional "cooling profile", but still gives a higher CHT.
@@scottduncan2353 great observations - thanks!
How do you know what your prop reduction is on your miniplane. Is it stamped somewhere?
Yes. Mine was etched on the redrive about 2" below my propeller shaft, although I've heard some of the older models are a little more difficult to find.
How much do you weigh? Which wing and its size are you flying?Thanks!
150 lb. The wing in this video is a 24 m^2 Ozone Roadster 2.
I weigh 175 and have a Spyder 26. What do you think, would the top 80 work for me?
Yes, but depending on the type of flying you like you might want something more powerful. There are plenty of pros and cons to each engine, but I'm very happy with my Top 80. Check this out if you're worried about power: www.miniplane-usa.com/tips/yahoogroup.htm
What are you flying currently?
Im 185 and fly a roadster 2/28 I also flew a revo 3 23m no issues with a 125cm e-prop at 500 asl.@@sirrabo8804
Hey. You can tell me how many rpm you have on the propeller eprops 130cm on the ground?
9200-ish for a full power ground run-up
It's weird. I have exactly the same propeller, e-props, 130cm, scimitar design, top80 19/73. The engine reaches 9600 rpm on the ground. I did not fly on it yet.
Weird indeed. Is this the only prop you've had on it, and if no, what was the previous propeller reading? I wonder if we have error between our tachs or if you're really outputting more power than me.
@@scottduncan2353 I checked with the second tachometer. Rotational speed is up to 9700 RPM, (9600-9700) measured on two revolutions, but the same company. I will try to get a completely different tachometer to confirm rpm. I live at 206m AMSL (675ft), temperature during test around 0 deg C. I still have a three-blade propeller, but it's adjustable so the measurement will not say anything. I'm starting to think that my propeller is less straining the engine. Can you read some signs from your propeller? (near the hub)
@@jandolasinski5384 seems like you had ideal conditions for the engine to generate power (lower temp and altitude).