Hi Dave,
Can one mount the 91 ST which is a heli engine on a plane such as the Venus 2??
Are YS planning a new two stroke engine for planes?

Thanks in advance
Brian

They work just fine in airplanes, but require a "reach thru" prop nut and a drive hub so you can mount a prop on it.

Hi Dave,

Where can I obtain the reach through prop nut and drive hub suitable for this engine from?

Regards,
Syd.

You "SHOULD" be able to get them from Probuild, but if not, try Central. The drive hub is the same as that used on the older 61 pattern engine, and the prop nut is a Tru-Turn product.

Hi Dave,

Can you please tell me what the thread size is on the output drive shaft for the YS91ST to enable me to select the correct Tru-Turn adaptor kit?

Regards,
Syd.

8x1mm