KaP2011

My Feedback: (17)

Ok, so I've never had a twin until now, an OS Gemini 1.60 NIB. I just finished reading the instruction manual cover to cover and there is no mention of fuel tank pressure nor is their a fitting on the exaust. I assume that pressure is not required? I'm so used to using fuel tank pressure that I'm a little nervous without it. I will be using an on-board glow driver. I'm going to put it on a Sig Spacewalker II with a 16 oz tank mounted in the standard location. What kind of flight times can I expect at 1/2 to 3/4 throttle? What prop would be a good match?

Any tips?

w8ye

My Feedback: (16)

The OS 160 twin runs fine without fuel pressure

scott17

17x6 APC, no fuel pressure, no onboard glow needed, very sweet running engine and very user friendly...not too bad on fuel at all, 16 oz will last plenty long.

JCOKEEFE

My Feedback: (2)

[8D]I have the same engine in my Spacewalker II. You will love the engine. No tank pressure required. For a prop, I use a Master Airscrew 16x8 which pulls the aircraft very well.
The fuel that I use is Cool Power 15%.

KaP2011

My Feedback: (17)

Thanks for the input guys. I've got several large size props I've had for a long time that I've never had a use for, one of them being a MAS 16X8 Simitar Wood that I thought would look cool. I run 15% Omega in most of my engines. (nothing smells like castor in the morning) I'll give it a try without the onboard glow power, no need to add weight I don't need.

KaP2011

My Feedback: (17)

Ok, I've been doing the break-in. I'm having to use a 17X8 3 blade for the break-in because that's the closest thing I have to an 18X6. (the recomended break-in prop)

I'm having a problem. I have to keep heat on the glow plugs to keep it running, even after three tanks of fuel. When I lean it out for peak , 7,500rpm, I can remove the heat but if I idle it down, 2,400rpm - 3,000rpmit dies.

I've broken in many engines in the past, including many 4 strokes, but I'm a little nervous with this one. Probably because of the investment.

I'm using Omega 15% for the break-in.

I'm thinking it is too rich on the bottom side but I'm sure it's too soon to lean it out. Isn't it? I usualy don't lean the bottom until I've ran a gallon or more through it.

KaP2011

My Feedback: (17)

I think I got it. Ran 4 tanks through it, by the end of the fourth tank it was running sweet. I leaned the low side about 1/4 turn and it is one nice running engine. I can't wait to get it in the air. Idles at 1,800 - 2,000rpms, top end at 7,700rpms with the 17X8 3 blade.

I'm a happy camper.

706jim

I recall getting about 11 minutes at WOT with a 16oz tank with that engine. So running it at varying throttle settings; you should have at least 15 miutes in the air. No pressure is required, but I will admit that the twin unmuffled pipes spray a LOT of oil all over the place. Keleo exhausts would really clean up the plane.