Rotax 185 muffler setup

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Postby Shannon » Wed Dec 01, 2010 9:02 am

Thanks George,

It's always been a nice bird !
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Postby Shannon » Wed Dec 01, 2010 9:08 am

Way back in the day !
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Postby russell » Wed Dec 01, 2010 1:28 pm

Hi Shannon, it is a nice plane. I'm curious to know what modifications you have made that necessitates the trim tabs on the ruddervators.
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Postby Shannon » Wed Dec 01, 2010 3:16 pm

Russell if you add a nosepod on the planes (mainly Series III's) it usually results in the need for tabs. The bit of weight forward along with the force of the wind acting upon the sloped windscreen will result in the need to hold slight back stick. Adding tabs will reduce or negate the need to be holding back pressure. As an example many factory EC poded Lazairs had tabs installed to correct trim.
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Postby russell » Wed Dec 01, 2010 4:27 pm

Ahh, I see. As usual I failed to think things through. :wacko:
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Postby russell » Wed Dec 01, 2010 4:30 pm

Which reminds me of what my Granny used to say....it's better to remain silent and be thought stupid than to open your mouth and prove it! I never heeded it.
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Postby Shannon » Wed Dec 01, 2010 4:47 pm

Well I suppose if you never needed them then it would indeed be strange to see planes equipped with them. Look at all the various pics and you see quite a few Lazairs (mostly Series III's, Elites, EC's) with tabs.
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Postby russell » Wed Dec 01, 2010 5:06 pm

Yeah, I've noticed a few from time to time even one on an aileron, which I figured that perhaps the wing washout wasn't the same. I'm still stuck in 1979 Lazair era.
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Postby Shannon » Fri Dec 03, 2010 8:19 am

On the flip side if you have a situation like this (chute mounted on boom aft) then you may need tabs pushing the nose in the other direction. I've only seen aileron tabs once and that particular plane was not assembled correctly.
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Re:

Postby flyboy9503 » Wed May 23, 2012 5:49 pm

Shannon wrote:Hi Pete,

I ordered the 1-3/4" springs from Manufacturers supply ($1 each). They are larger diameter springs but do look as if they would work until/if a suitable OEM type spring can be found. Bit of a devil to put the last spring on when assembling the manifold but doable. Tension on the assembly is good but not too stiff. I plan to try this set-up out on the test stand to make sure it will work.



also try dennis kirk you can buy all of the exhaust parts there although i am not sure about the muffler.
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