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Contra Rotating Propeller Drive for f3a 2m Pattern Planes

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Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Old 06-09-2022, 06:29 PM
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Thanks Dave and Brenner!
Old 06-15-2022, 10:04 AM
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Hi Brenner, I managed to take out the collet and remove the contra, now I'm having trouble reinserting the collet. It only goes in a few mm into the motor shaft and I can't put it in all the way, how do I do it?
Old 06-15-2022, 10:39 AM
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Originally Posted by danielcaceres91
Hi Brenner, I managed to take out the collet and remove the contra, now I'm having trouble reinserting the collet. It only goes in a few mm into the motor shaft and I can't put it in all the way, how do I do it?
Hey Daniel,

You will need to press it back on using a small press. When you do this the bottom of the motor must be supported by the press. When you press it back on make sure that you press it all the way down so there is no axial play in the motor bearings. If you don't have a press then I suppose you could maybe use a C-Clamp, but I have never done it this way so I can't recommend it from direct experience.

Brenner ...
Old 02-06-2023, 09:13 PM
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Hi CR Guys, what happened ? 8 month no post? I would like to get CR power unit for one of my giant Bipe foamy currently running "Eflite160 spinning 22x10 on 8S".After looking at it, there's very little avail in this large CR dept. also pretty reach $$$-wise.
I'm not after the speed like F3A pilots, but opposite, for very slow flying 3/D model I preffer larger props (23-26") at very low pitch (5-6) as the torque is my priority.
Am I wasting my time with what's avail or should I pursue it further? TX, for any hints, Joe.

This is the giant model at ~13lb on 8S, 4,5Ah.
Old 02-07-2023, 08:27 AM
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You're not wasting your time. I think you would like the performance that a modern f3a Contra Drive gives your plane.

With a Contra Drive you are going to want a much higher pitch than you would use with a single prop Drive. This is because each prop on a Contra Drive absorbs half the power absorbed by the single prop on a single prop Drive. Your 5" - 6" pitch would be equal to 10" - 11" pitch on an equivalent Contra Drive system. The lowest pitch that you can find for an f3a Contra Drive system is 18" of pitch. However, I think that this would actually work well for your plane. Anything smaller won't fly your plane fast enough to stay in the air.

Brenner ...
Old 02-07-2023, 02:13 PM
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Hi Body, TX for getting back, this model is something totally different to regular Patternship, it has 3X lighter wing load, flying like a snails speed so my last concern is staying in the air. As I mentioned I'm not after speed but "Torque", with larger prop diam. and minimal pitch. I'm more after wider wash over the tab controls at slow speed for slow 3/D manuevers, and quick control response.
I can see the problem with the available props with only high pitch for F3A, (the last thing I'm after!) but I do believe I might get variety I'm after if I look into drone ones.
Look, I'm currently flying 3 CR models (micro lights) and I find the lowest pitch works best for my requirements. Going as low as 2.5-2.8 at 10" Carbon ones from PT in CZ.
But first I have to look what kv motor might be the best for my application, so I'll do more fishing around. Regards, J.

I'm reducing pitch to minimum by prop mods to get the best out of it.

Lowest pitch works the best in this application, "slow-low&close"


Old 03-04-2024, 11:16 AM
  #2032  
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Hey Brenner,
Is the thinking still the same regarding right thrust needing to be 0?

I ordered a plane that was supposed to come with a contra nose and turns out it has about 2 degrees right thrust built in.
Old 05-14-2024, 10:54 AM
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It seems nobody here has realized that Mike Gaishin is no more…and the Brenner V4 will not be supported anymore.
My thoughts to the family and a salute to mr Mike Gaishin for manufacturing one of the most brilliant systems in the f3a arena ever.
The V4 contra drive has been a positive contribution to so many pilots in my country, including myself, so from here, fare well on the next journey, Mike ! And Thanks ………
Old 05-14-2024, 02:39 PM
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Originally Posted by Eggert
It seems nobody here has realized that Mike Gaishin is no more…and the Brenner V4 will not be supported anymore.
My thoughts to the family and a salute to mr Mike Gaishin for manufacturing one of the most brilliant systems in the f3a arena ever.
The V4 contra drive has been a positive contribution to so many pilots in my country, including myself, so from here, fare well on the next journey, Mike And Thanks ………
It's a sad day for all of us. Mike was a big part of the V4 Contra Drive, especially in the last few years. The motor that he designed specifically for the V4 Drive was of the highest quality. In the wake of his passing, there are enough parts for the V4 Drive to last for several years. We are in negotiations right now to make these parts available to the modeling community. Nothing could be done until Mike passed and a respectful amount of time had passed; discussions are moving forward and we hope to have solutions available for people who need parts in the near future.

Brenner ...
The following 2 users liked this post by Brenner:
Nitroaddictpilot (05-14-2024), wattsup (05-15-2024)

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