Author Topic: Propellor question (Read 2077 times)

C.T. Schaefer · « **on:** February 19, 2013, 03:09:14 PM »

I have been building a couple of new (first in 30 years) carrier ships this winter. One for profile and one class I. They both have reverse engines and, of course, the prop selection is limited. My question is how safe is the APC 9-6P for these relatively high rpm motors? What have you guys found out from experience? I suppose the Zingers would work ok but might need some tinkering to get best performance. Thanks, CTS

bill bischoff · « **Reply #1 on:** February 19, 2013, 03:28:46 PM »

I have been using them for years, turning about 18,000 static rpm with no problems, or even any indications of stress. If you are really worried, perhaps Steve Wilk of Eliminator props would make some carbon props for you.

eric david conley · « **Reply #2 on:** February 19, 2013, 06:04:28 PM »

I've also used the APC 9/6Rs in all of my carrier planes. I use Nelson engines, large case 36 for AMA Profile, 40 for CL-1 and 45 for CL2. The 36 turns 18000+ on the ground and the 40 and 45 turn more. A close friend tried using the APC 9/7 with the counter clock wise 45 and it didn't perform as well as his 45 with the APC 9/6R so went back to the 9/6R. No trouble yet. Eric

C.T. Schaefer · « **Reply #3 on:** February 19, 2013, 06:17:04 PM »

Thanks. I wont worry about it. Don't know exactly how much rpm yet. Gotta get done with winter!! CTS

C.T. Schaefer · « **Reply #4 on:** February 19, 2013, 06:18:24 PM »

P.S. Are you guys running mufflers or nitro?

eric david conley · « **Reply #5 on:** February 19, 2013, 08:21:31 PM »

I'm running Nelson's quarter wave muffler on 10 persent fuel on all three of my Nelson engines. These are the heavy case or pylon engines and give the best results (for them) with the muffler and 10 % fuel. I get around a 1500+rpm gain with the muffler. The engines were not made for high nitro fuel. I do pay an almost 4oz penalty with the mufflers but think the payback is worth it. Eric

bill bischoff · « **Reply #6 on:** February 20, 2013, 09:22:12 AM »

open exhaust and 50% nitro.

Duke.Johnson · « **Reply #7 on:** February 20, 2013, 10:01:39 AM »

Since we are on the subject, I just bought two wiley .36 reverse rotations. What prop would you use for them? One will be for a MO-1 .36 carrier.

bill bischoff · « **Reply #8 on:** February 20, 2013, 10:27:14 AM »

The very prop being discussed, the APC 9x6 pusher.

Duke.Johnson · « **Reply #9 on:** February 20, 2013, 12:35:17 PM »

Quote from: bill bischoff on February 20, 2013, 10:27:14 AM

The very prop being discussed, the APC 9x6 pusher.

As always, thanks Bill. I see if the LHS has them.

C.T. Schaefer · « **Reply #10 on:** February 20, 2013, 01:06:21 PM »

My junk is kind of old school. Fox Mk7 with Fox carb and a K&B 6.5 RI. Both use 'mufflers'.

eric david conley · « **Reply #11 on:** February 20, 2013, 02:17:11 PM »

CTS, what kind of mufflers are you talking about? If they are the very small type that usually came with the early engines do you have to use them, like is it a rule that you have to use a muffler where you fly? Eric

C.T. Schaefer · « **Reply #12 on:** February 21, 2013, 07:42:46 AM »

I was kind of joking. They are both equipped with tuned exhaust systems so I have to use the 10% fuel. I'm trying to be more sensitive about the noise and easier on the motors as well. Glow plugs used to cost .50. Getting cheap too. Will have to wait for some warmer weather to 'tune em up'.
It's been nearly 40 years since I used tuned exhaust on a competition carrier plane. They changed the entire rule book to discourage my efforts at the time. CTS

Wayne J. Buran · « **Reply #13 on:** February 21, 2013, 08:23:26 AM »

Quote from: C.T. Schaefer on February 21, 2013, 07:42:46 AM

I was kind of joking. They are both equipped with tuned exhaust systems so I have to use the 10% fuel. I'm trying to be more sensitive about the noise and easier on the motors as well. Glow plugs used to cost .50. Getting cheap too. Will have to wait for some warmer weather to 'tune em up'.
It's been nearly 40 years since I used tuned exhaust on a competition carrier plane. They changed the entire rule book to discourage my efforts at the time. CTS

Well, welcome back anyway.
Wayne

Wayne J. Buran · « **Reply #14 on:** February 21, 2013, 08:26:07 AM »

Anybody know where I can find a revers crank for my Irvine .36's and my K&B FI .40 gray case. Inquiring minds want to know.
Thanks
Wayne

bill bischoff · « **Reply #15 on:** February 21, 2013, 09:29:41 AM »

If you find reverse cranks for the Irvine, I want one too! I have a K&B 40 reverse front end and crank on an engine that I flew on a Skyray. (There was an actual reverse front housing, with a reverse spiral oil groove.) When I die you can have it, but not before!

Wayne J. Buran · « **Reply #16 on:** February 21, 2013, 09:33:37 AM »

Bill, since I was born in 43 I dont think you have anything to worry about.
Wayne

Author Topic: Propellor question (Read 2077 times)

C.T. Schaefer

Propellor question

bill bischoff

Re: Propellor question

eric david conley

Re: Propellor question

C.T. Schaefer

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C.T. Schaefer

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eric david conley

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bill bischoff

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Duke.Johnson

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bill bischoff

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Duke.Johnson

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C.T. Schaefer

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eric david conley

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C.T. Schaefer

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Wayne J. Buran

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Wayne J. Buran

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bill bischoff

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Wayne J. Buran

Re: Propellor question