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Sukhoi iris

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Jay Hodge

Joined: 24 Apr 2008
Posts: 27

Posted: Sat Mar 10, 2018 6:12 am Post subject: Sukhoi iris

Hey Guys,



I have a Yak 55M that does not have an iris or shutters installed. I found an iris from a Suk, and would like to install that. Anybody done this before? Any problems I should know about?



Thanks,



Jay

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Vic

Joined: 12 Aug 2008
Posts: 113
Location: Southern Bavaria

Posted: Sat Mar 10, 2018 6:03 pm Post subject: Re: Sukhoi iris

I have replaced the Yak shutters on the 18 T with a Sukhoi iris for easy access and better view of the engine. Expect to be faced with a LOT of friction in the actuating linkages and lever. I do not know how  the system works on a Sukhoi but anyway we fitted a longer lever and bigger knob in the cockpit for that reason so be prepared for some troubles. 



   Vic

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Jay Hodge

Joined: 24 Apr 2008
Posts: 27

Posted: Mon Mar 12, 2018 1:11 am Post subject: Re: Sukhoi iris

Vic 



Thanks for the reply. Other than the friction problem, everything sort of fits right up?



Jay

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Vic

Joined: 12 Aug 2008
Posts: 113
Location: Southern Bavaria

Posted: Mon Mar 12, 2018 4:49 am Post subject: Re: Sukhoi iris

Hi Jay,

to be open, there are a few bits you have to work out from your side: Seems I did two new brackets to mount the iris to the engine, plus a new lever, see photo. I believe my shutters came from a Sukhoi but don´t know why there is a difference, variations of M 14 gearbox castings ?

   Then you will design an extra mechanism for actuating the iris. The high friction prevented using the original push-pull cable in the 18 T, so I made up a twin pull bowden system with two cables and torque rod from fire wall to the iris, sorry, no photos at hand. Does anybody know how the system looks in a Sukhoi ? Maybe you will come up with something else, depending on conditions in your aircraft. At least you got the warning to know where problems might be and fabricate a good system from the start. I tried hydraulics first, but that was not quick and easy and had snags in detail as well.



    Vic

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