I am just about to purchase an OS120AX to go into a Funtana X100 and was wondering whether to also purchase a Perry Fuel Pump for the motor (Not For Smoke) the one that takes its crankcase pressure by drilling a hole in the rear back plate of the motor.

Are they any good, and would the engine or I for that matter benefit from one fitted.

An early response would be appreciated as it may be as soon as this afternoon, if no answer by then may delay purchase of pump but still get the motor.

Thanks
Simon

Diamond Dust,

I had an OS 120AX in a Funtana X100 and did not use a pump. I was running a Bisson pitts style muffler and an APC 17X6 prop. Unless your planning on moving the fuel tank way back on the CG there is not need for a pump.

Thanks for that Zippi, What size spinner is that you have, and was it powerful enough with the 120

The spinner was the size that was suggested in the manual if I recall. The OS 120AX will give you unlimited vertical.

This is the understatment of the new year. David

The OS 120AX will give you unlimited vertical

i have a 120ax on a 120 wild hare edge, and dont see a need for a pump

Thanks everyone. I have purchased the engine today, looks a nice piece of kit. Took your advice and didn't bother with the pump. I am going to nail it to piece of wood and run a couple of tanks thru it tomorrow.

Cheers

Simon

the o.s 120 ax does defonately have enough power to hover this plane, heres a pic:

I would think to use a tower or performance especialities or Jett muffler instead of a pump

I am using a Perry pump with a mid fuse mounted tank (on cg) in my Extra 300. Great performance. I think the Perry is a good adition to this excelent engine.