Rubber exhaust deflectors Good or Bad - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-10-2010, 09:32 PM   #11
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Re: Rubber exhaust deflectors Good or Bad

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I have seen engines work great with them, others not so great.

One thing for sure- If I have a student with engine trouble and he has a deflector attached, then I have him remove it while we troubleshoot. Sometimes the engine problem goes away when we remove the deflector. Sometimes in the end it is something else. But when trouble shooting, I prefer to have less variables and will eliminate the deflector a a cause by removing it.
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Old 08-11-2010, 09:00 AM   #12
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Re: Rubber exhaust deflectors Good or Bad

Bob: I use the same prop that you do (13X4 wide APC). After reading the responses, the large amount of residue may be partially caused because the motor is mounted upside down. I never thought of that! I flew last evening and for the first time noticed a grey streak in the residue. Will be checking my muffler today to see if something in loose. Cheers - John
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Old 08-11-2010, 07:48 PM   #13
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Re: Rubber exhaust deflectors Good or Bad

I was out flying tonight. Could not make up my mind if more power or not. So I have to conclude that if there is a difference, it is not noticeable. But my plane was cleaner with it on. So the Dubro deflector wins. I use a metal hose clamp to hold mine on. I haven't lost one in recent memory.

Thanks for all the input.
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Old 08-24-2010, 06:29 PM   #14
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Re: Rubber exhaust deflectors Good or Bad

The muffler extensions never seemed to keep the oil stuff away and just add back pressure to the motor causing the motor to have a twitchier mixture and run hotter with less power. I fly scale planes that often do not get proper cooling so i do not use them, just have a bunch of paper towels.
Just putting a thought out there... electric? Had good luck with a triplane getting good flight times and near vertical so maybe it is a option. Also its nice to not have to start it when the plane tips while taxiing.
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Old 08-25-2010, 06:02 PM   #15
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Re: Rubber exhaust deflectors Good or Bad

I agree with using exhaust deflector it does add back pressure to the engine .It does run hotter and is more sensitive to tuning.Although i did find when using them they did help to control the slick you would find on the aircraft.
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Old 09-02-2010, 12:13 AM   #16
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Re: Rubber exhaust deflectors Good or Bad

Originally Posted by R.Sonnel View Post
I am using a Dubro rubber exhaust deflector on (the grey ones) a OS55AX. My question is this. Does it make any difference for power, or any other difference in the way the engine runs. The reason I am asking is that when I took it off the engine seemed to have a little (very very small difference) more power. My engine is still fairly new, so is it because it is getting broken in or does that Dubro deflector make a difference. Could be my imagination.

Thanks in advance.
I have a OS 55AX and have been running a 6 inch hose to deflect oils with awsome results. The trick is to use a hose with a larger ID then that of the exauhst hole at the end of the silencer.
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