RunRyder - Stratus YS91SR

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Miniature Aircraft Nitro/Gas Helicopters > Stratus YS91SR - what RPM?

Knud Pedersen
Veteran
Location: Denmark - Europa

Hi

My crankshaft broked in my OS91SZ OMI yesterday.
Actually it's been running much better after I reduced the RPM from 16250 to 15750, but maybe it has damage because of the high RPM.....

well, now I have ordered a YS91SR

What RPM are you guys running them in your Stratus 8:18?

I have also ordered a Hatori Sb19, but until that comes, I will fly it with the 939 (Sb18), can I use the same RPM?

ChopperKnud

Knud Pedersen

06-02-2008 11:19 AM

HOMEPAGE

bparro
Veteran
Location: indianapolis,in

1900 headspeed. which is 15,542 engine rpm.

Miniature Aircraft USA, V-blades

06-02-2008 02:33 PM

cdrking
Elite Veteran
Location: Seattle

Quite a few posts I've read recommend no more than 15,400. I'm running mine at 15,200. At 1950 headspeed it pulls like a freight train, really nice power and smooth.

You will really like it.

Jeff

To hover is divine, the alternative is rather PLANE.

06-02-2008 04:47 PM

Carey
Senior Heliman
Location: Allentown, NJ U.S.

Couldn't be happier with the 91SR and SB19 pipe.

1950 headspeed.

06-02-2008 05:07 PM

Knud Pedersen
Veteran
Location: Denmark - Europa