Help running an OS 10 LA

I run 7x4 props on my .15's, so to me it sounds as though it is over propped. But what do I know?

Ed Cregger

It started to rain today, so I ran out of time. But I will give a 7x4 a try. I found on Tower Hobbies website that the 10LA rpm range is from

2500-18000. So it sounds like I should be getting a lot more rpm. Is the A3 plug OK for 15% nitro?

That same web page suggests a 7x4 or 7x5. Ed hit the nail on the head. I guess the engine comes with an A3 plug. If I recall correctly, that is a long reach plug. Personally, I would use an OS 8 plug. JR

I'm at a loss on the glow plug, Norm. I could never afford OS plugs back when I was messing with the smaller engines. The smaller engines are lots of fun.

Ed Cregger

The engine won't develop much power at 10,000 RPM. Try a smaller prop...one that turns at least 14,000 RPM on the ground. You will be surprised by the difference in power you get (plus it will be easier to adjust).

Ed Cregger

will give a 7x4 a

range is from

more rpm. Is the

though it is over

can get the

good RPM for this

LA. Well anyways

runs slow but

do get it to a

idle to full RPM.

15% Omega fuel, and

take a long time to

Get a short plug too, just in case. Those smaller engines don't have much head space and a long plug may be "too" long.

Don

Well I tried an OS 8 and a 7x5 prop, the fastest rpm I could get it to was

12000 rpm. Changing between an A3 and OS8 didn't change the rpm. I also don't get any additional rpm if I leave the glow driver on it. There is no airbleed screw on the 10LA, so the only adjustment I have is the needle valve.

3.95oz for the 10la and according to the specs it will turn almost the same prop as the Thunder Tiger 15. But obviously not my 10la.

Most of the .15 size engines I have encountered use short glow plugs, but there were a couple that used a long glow plug. I guess you have to check the engine out to be sure.

I ordered a card of K&B 1L glowplugs from National Hobby Supply when they were still selling airplane equipment. I failed to check the card when it arrived. Some time later I went to get a plug from the card and it turned out that they had screwed up the order. They sent me a card of K&B idle bar equipped long glow plugs. Argh! The point being, if anyone needs any long K&B plugs with idle bars, keep me in mind.

Ed Cregger

Don't believe specs. The TT is a pretty good engine, and has 50% more displacement. For the .10, a 7x3 or 7x4 would seem plenty prop to me. More than that, and you bog down the engine way too much.

The fox long reach with idle bar does not fit in the 10LA.