Has anyone used a 30 OS OR 30 Magnum for control line ? What were the results?
   


                                            bob lindsay

Hi from France ..... I read a very good article in 'Control Line World ' written by Bob Dixon regarding the use of R/C 4-Strokes for C/L.
He was advocationg you can get a satisfactory stunt run without the need to exchange the R/C carb' for a conventional Venturi set-up.
I bought an un-run Magnum 30 off the infamous E-Bay and set to work running it in carefully , as I'd never tried a 4-stroke before.

A Graupner 9x5 , 20% lube [ 17% synthetic / 3% added castor ] was used for bench running-in. She was happy to run at around 2 turns open on the needle  at around 8,000 rpm.
After around 75 minutes of shortish runs she felt just right. I'm a luddite when it comes to running-in new engines !
Oh .....Unlike the previous contributor I never needed an electric starter. 4-strokes need to be well primed as you probably know , this you can do by just blocking the silencer outlet if you can't get to the carb'.
I built an airframe to install the Magnum [ sidewinder /profile] , and fitted a uniflow tank without exhaust pressure , around 2 ounces.
The R/C carb' was 'wired' fully open.
I reckoned a Master 10x6 would be a good prop to start with , and off we go to the field.
Getting to know an new engine by carefull running in always pays off !

A good prime and after a couple of flicks off she went with 2 and a quarter turns open [using the same fuel as the running-in fuel] and the tach showing I think around 8,600 / 8,700.

The tank lasted about 9/10 minutes and the engine didn't falter. Oh .... and what a noise , or lack of it !

In summary , the  Magnum 30 [ or the ASP or Super Custom Brands ] is a little gem . Easy to get to know well , easy to start , well made and great value.
Wouldn't hesitate in recommending one !

Or , maybe Ive been just lucky !

Kind regards from the Charente in France from an ex-pat Brit !

Robin

    Has anyone used a 30 OS OR 30 Magnum for control line ? What were the results?

                                            bob lindsay

I have no experience with either the OS or Magnum, but on the recommendation of Bob Zambelli, I've acquired several Saito .30's. I'll also mention that Pat Johnston has developed his C/L conversion for the Saito .eo, similar to the one for the Saito .40. They are available for $25. The parts are a unit to replace the throttle barrel, with a nylon screw opposite the NVA for choke area adjustment. Very clean design.

Anyhow, one Saito .30 goes on a U-Key .35 today, then one on a Humbug (I think) and two (with throttle) on an
F-82.

My one and only 4-stroke was a Saito 30 some time ago.  Tried to fly it in an OTS Dragon. Tried several props and fuel, but couldn't get much out of it.  So I swapped for a Fox 35, and it had more power.  Now, that's something! (p.s. the Fox is from L&J with all the bells & whistles)

Floyd

Hi All, Several years ago I bought a Magnum .30 4C and after having run it about an hour I mounted it on a Ringmaster Sterling heavy, not light by any means! I put a 9 X 4 APC prop on it, used an electric starter and off we went! It flew with authority and strength! I kept that combination together until I flew it in very heavy wind and bent the plane a little! Had the stock carb wired wide open just and Mr. Francaise did and mine worked well too! I have had a mixed love affair with the 4C engines viz. Satio worked well, OS .40 pre surpass was wimpy save for 20 20 all synthetic fuel, and the Surpass .40 an unreliable Bi Polar engine! One day up the same day down! I think I'll try an FP .35! Phil Spillman