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HelicopterFuel-Helicopters New or Limited ActivityGraupner › Does anyone know if an o.s. 91 SX-H fits a starlet 50?
01-23-2007 12:37 AM  10 years agoPost 1
mylo

rrNovice

Ireland

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I was just wondering if anyone knows if an os 91 SX-H engine will fit the uni- expert mechanics (starlet 50).I know the engine mounts will need to be changed, does anyone know what i need to do? Thanks

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01-23-2007 06:49 PM  10 years agoPost 2
MichaelP

rrKey Veteran

Northumberland UK

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I think the 91 might be too big to fit also I would imagine that there would be gearing issues as well.

http://www.webstarts.com/micksscalehelicopters

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01-23-2007 11:01 PM  10 years agoPost 3
mylo

rrNovice

Ireland

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thats right. i was told you would need a different main gear because the ratio would be different as the larger engine produces more torque a lower revs. I'll keep looking around to see what other people have done. Thanks skypilot!

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01-27-2007 11:29 PM  10 years agoPost 4
Wemo

rrApprentice

Hampton Roads, VA

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Mylo...you have to be careful with Graupner mechs. It's a whole different world and you can't use a standard OS engine if it's not for Heim Graupner. Skypilot is right...gearing and engine is the factor. The Uni-2000 can only support the OS 91 and with it's four gearing options, it does not support using Starlet 50 mechs, furthermore, even if you had UNI-2000 mechs, it wouldn't work because it's not a HG (heim Graupner) OS 91 engine which has a standard shaft. Two reasons why it won't work for your Starlet 50. 1)OS makes special engines for Heim Graupner which have HG after OS 91 (ie, OS 91 FX-HG) and OS 61 (ie, OS .61 SX-HG) engines. OS HG uses long shafts for Heim Graupner engines. The reason why I know was because I wanted to get a OS 61 LX-H for my UNI-EXPERT mechs. I won't work, because of the shaft and it's dimensions. So, good luck. So, you may need to find anothe project for your 91.

"How high do they go? Are those things hard too fly? How much do they cost?

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