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Speed,Combat,Scale,Racing => Carrier => Topic started by: C.T. Schaefer on February 19, 2013, 03:09:14 PM
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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
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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.
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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
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Thanks. I wont worry about it. Don't know exactly how much rpm yet. Gotta get done with winter!! CTS
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P.S. Are you guys running mufflers or nitro?
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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
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open exhaust and 50% nitro.
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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. D>K
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The very prop being discussed, the APC 9x6 pusher.
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The very prop being discussed, the APC 9x6 pusher.
As always, thanks Bill. I see if the LHS has them.
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My junk is kind of old school. Fox Mk7 with Fox carb and a K&B 6.5 RI. Both use 'mufflers'.
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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
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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
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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
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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
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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!
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Bill, since I was born in 43 I dont think you have anything to worry about.
Wayne