BiggerDanno

I have access to quite a few NIB control line engines from .09 to .60 ci.
Most have rear intakes using a venturi. Most do not have provisions for an exhaust.
Many different manufacturers.

Would any of them make a decent speed engine?

airraptor

My Feedback: (66)

any engine can make a great speed engine if you can get enough air and fuel in. We have taken FP/LA/GP cheap sport engines and made them turn some great numbers. The GP 42 is the best of them 10x7 at 15,000. just have to have the right combo. i think most control line engines are set up for torque which would lend them well to mods.

Rob590

Hi all.

To avoid opening new thread on rather simmilar question.

Ihave old Russian (USSR) Raduga 7 control line engine.

www.youtube.com/watch

It has 7 ccm, and runs on 3:1 methanol : castor oil.

Video above is first run with stock propeller, and glow plug (engine is manufactured on 8/1/1975)

Would it suffice for some kind of speed plane?

RPMrange is in 12000 +/- 1000 static.

I would run it with stock venturi (throttle on 2-position switch).

combatpigg

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The original speed engines were ALL control line engines...and to this day a true RC speedplane does not have a carburetor...just a control line venturi.
It is actually impossible to build a nice fairing around a RC type carburetor mounted up front.
Having a carburetor is useless on a RC speedplane and is comparable to having training wheels on a racing bicycle.

Rob590

Nice comparison, thanks.

Could you, please, give me some pointers in size and/or plans for the model Icould build around this particular engine? What fuel tank size should I look for? Would 150 ccm (5 fl. oz.)suffice?

bob27s

My Feedback: (19)

Details on displacement and manufacturer?

To briefly answer your question ...... MAYBE.

Many control line engines are very specialized.
CL speed engines - (tiny props, huge rpm, tuned pipe, need proper fairing/cooling)
CL carrier engines - (have to go both fast, and go slow throttled usually open exhaust)
CL stunt engines - (ported for lower rpm, sometimes nearly 4c operation)
CL scale engines - (most like r/c sport engines)
VERY different in construction, porting, intake timing, compression.

Likely if the are rear rotor engines they are configured for speed use.

Pictures?

BiggerDanno

There are quite a few different ones.
A few that caught my eye because they can attach an exhaust are:
Rossi 60
Veeco 50
and a couple of other 40-60's that I can't remember the make.
There are a lot of smaller diesels too.
Some guy died and left them to our club, I can purchase any I want for $40 ea
Most are not equipped for exhausts and therefore would not be usable where I fly.