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HelicopterMiniature Aircraft Whiplash & Fury 55 › Stratus YS91SR Questions
08-09-2007 11:51 PM  10 years agoPost 1
Voffsen

rrApprentice

Tromsø. Norway.

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Sure its asked before, but im to lazy to search.

Im tired of my C-Spec and are going to mount a YS 91SR in my heli.

Question is... what is the ultimate gear ratio for this engine?
I have 8:18 gearing now.
And wich headspeed?

I also need to change the two plates between the engine and the main bottom plate?


- Bushman at 3D Master (Master of the Masters)

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08-10-2007 12:22 AM  10 years agoPost 2
airdodger

rrElite Veteran

Johnston USA

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I would try the 8.18 before changing. I would try around 1850.

Chris

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08-10-2007 01:20 AM  10 years agoPost 3
dogg5306

rrVeteran

Brussels, Belgium

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Should you need to go to YS91SR, I've been said to KEEP the 8.18 ratio... (check Todd Benett site) that said I'm just wondeing whether or not you need to order the YS91 carbon adapter plate to properly attach the engine... (I'm not using any on the OS 91 SZH)

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08-10-2007 03:21 AM  10 years agoPost 4
kthane

rrVeteran

Pensacola

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The only one I've seen so far was running 8.45 ratio and running 1900 on the head. Was also using the the SB19LS muffler designed for the engine. It put my 91ST4 to shame, 91SR/SB19 is on my xmas list.

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08-10-2007 03:33 AM  10 years agoPost 5
DS 8717

rrProfessor

Here wishing i was​somewhere else

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I'm running 8.18 with my YS 80,works pretty dam good at 1930 headspeed.You may need the shim under the backplate to get the clearance right on the clutch. 80 and 91 use a different shim,not sure what the SR will use.DOUG

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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08-10-2007 10:28 AM  10 years agoPost 6
MrMel

rrProfessor

Gotland

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I put in a SR in mine,

I ordered bottom plate (YS) MA126-28, bottom adapter (YS) MA126-29 and dont forget upper collet 0546-11 for the fan which is special for YS.
If you buy the collet "set" 0546-20 instead of just the upper collet you also get longer screws (M3.5) which you need for the bottom plate.

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08-12-2007 02:32 AM  10 years agoPost 7
T 3d

rrApprentice

Boston Mass

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ys 91 problems

Has any one have a ys91 st if so did it give you a lot of problems

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