I have been offered one of these and was wondering if they can work as a stunt motor.  George

He said fs but he could be wrong as he is an electric flier.  George

Myself, Jim Lee and a few others used it -stock-as a stunt motor for a few years.  Yes a lot more power than an LA but also heavier.  Jim used his for at least ten years,   I gave up after a couple.   In my case they chewed up rods in a hurry.   Had to replace them about every 50-60 flights.   I concluded there was some internal misalignment problem putting extra stress on the rod.  I think that is when I went to the Wiley .40 and pipe and sold my .46 SFs.   

Dave

Assuming it is an OS 46sf, and it is **unmodified**, they are very powerful, easily a match for a 45FSR. I don't have one but I have seen quite a few of them, use typical 46VF props like a 11.5-4 3-blade, etc.

     Brett

Clone 9 royal . 46 ( its now in a OS case ) Eye Denical , bar its notta ' S ' . Only 80 Ounce . with a 2 x 6 . Short Adamisin tube muffler - suction . 15 % Nitro .


As it was a bit short , we putit IN two clicks . where OUT two ( four back from there ) woulda gottit spot on . And run out . as its only 6 ounces .
Eye Dentical Perfomance to a P D P 4 round head S Tigre 60 . In that Id messed around and got nowhere , till that set up .
Seems to like the Master 12x 6 wood . Have used it in the Spit & P-51 on 10 % as theyre not quite as heavy . Can be quite economocal then .

Theyre kinoff a side exhaust VF , sme era, anyway . Used a 9 m.m. ! / .320 in. INTAKE , there . .312 in the others .

Bob hunt used that in the FSR , so if it were a FSR - S ( which dont exist ) a 4 inch pitch , gets ' the switch ' -

Usually you have a ' Flow Through ' cowl asinthe HOLE above the C' Cae - or side vents up top , so they dont get stuck roasted & lean . For either Type .
The AX & FX arepretty much tarted up ' S F ' s  . Theres a ton of CLONES too , all the parts interchange . a VF has a 16 m.m. crank whereas  a 15 m.m. is in the SF .

Offline RandySmith

 OS 45FSR & OS46 SF

  I was given a stunter without a motor that originally had an OS 45FSR in it .  Went thru my stock of motors and nothing matched
the mounting bolts. Then a friend offerred me an OS 46FS that was set up by Tom Muggelton and it fits the plane well . What are the differences in these motors in how they run .
      Bill

Hi Bill

Both motors are fairly powerful ones, They will turn a 13 inch 2 blade or 12 inch 3 blade and need to be loaded, Try not to run a very small prop, They both can be made to run a very nice powerful high RPM 4/2, depends on which one you have, I have setup many many of both the engines, I try to get the people using mine to run a 4 to 5 pitch prop, Do not run high pitch props, as you will be flirting with a lot of runaway possiblity.  pitch is just too much.
A 12.5 x 4.5 2 blade is a good prop for either motor, or you can go down to a 12 inch wide blade prop at 4 or so pitch.
The 12.25 x 4.5 2 blade Mgic and Bolly works well  as does the 12 x 4.33  3 blade Magic.
The FSR has a lot of clone motors that have the exact mounting,Royal and The Taiwan built Magnums. The SF  is a little wider and is a little heavier.
Please do NOT  try to cut away the compression from the head to tame the motor, just use a larger load prop with lower pitch.

I have these all over the country running, you maybe able to see a few near you, or ask

Randy

Other people go on bout them needing a ' close ' muffler . Rather than a big one . Tho I mave use a big T&L tube on the Sf no sweat . perhaps .
The weenie C S C / Bob hunt Genisis  FSR .40  tounge goes onem BOTH as the SF is dual bolt pattern on the Ex stack .

I got the engine tonight and it is an fx 45 not fs. The man who gave it to me flies electric not glow. He said it was way more motor than he needed. It has not been modified it is a stock rc motor. I will put a venturi and needle valve on it and see what it does. I think .300 should work. I would like to hear any suggestions.  George

If it is an OS46FX I have used one for stunt but I don't recommend it.  It is extremely powerful but the comfort range is very narrow.  Swapped with an OS46LA the lap times on a plane drilled for both went from 5.5 to 4.1 each running a fast 4.  The plane was 55 oz.  If you have something i the 70oz+ it may be usable.  If you can find someone with a 46AX they might be able to help you tame it.  Mine was lost in a fire.  I was going to get a curved header and put it on a pipe but never got to.

Ken

Thankyou for the information. I will get a .260 intake and os nva and see what it does. I willtry a 12x4 for a start.  George

After cleaning out the crankcase of rusty oil residue oiled up the bearings and put it on the test stand. I used the rc carb locked wide open a 12x4 wood zinger prop 10/18 s&w fuel. I was somewhat disappointed with the results. 9300 was about all it could do. It had little compression right after the run and the crank has a bit more up and down movement than should be. The bearings now sound rough. I don't know if the cost of the bearings and a venturi will be a good choice . I will keep you posted.  George

Probably not your issue but my FX had a misaligned head when I got it off of the bay. It had not been torqued in the right order and was causing a slight rub at TDC.  When it ran this way I was only able to get about what you were getting.  Once corrected if revved up fine.  It was not the -H version.  None of my OS motors had much compression after a run.  I thought it was normal.

Ken

Sounds like its JUNK , but strip it for spares . The Rod & parts - screw set . a lot interchange .

BUt the SF is just about the same , the 15 % gives it the tourque for the big prop - 12 x 6 ,
and keeps the fire alight , rich , Enya 3 plug . with the big intake . on a big plane .

Using the .312 on the P 51 & Spitfire . Around 65 / 70 ounce . on 10 % . 4 - 2 run . use the 11 1/2 x 5 1/2 three blade too .

Runnig rotten rust thru it will do a liner in sharply , on the old 40 FP too . from poor storage . A LA 46 liner would take it to a 51
but then the head would be 1 m.m. too small .
11/20 :
Just got another one . A Megatech .46 , which is ABC and apparently ? all the ' sticker on the boost ' ones are made by LEO . if theyre not Taiwanese . ? As in you can see the BRASS .
THIS is mega glued , mega rotten bearings . Ex R. C. snot thrown on shelf unoiled after nitro . May have to cut case in half to get the liner out . Or will try slotting a penny washer 7
lifting liner by that , underneath .

If you have a Master 12 x 6 wood , try it .
Ive thinned & trimmed a 13 x 5 to 12 inch . Has a bit of blade for the hot weather , but theyre not going to take a knock , at 2/3rd hickness .
But swings it easy . Youd get that in a deep 4 stroke , with a bit of nitro & a enya 3 plug .  say 2 stroking in the upper circle .they switch well .

.312 is the hunt FSR 40 Genisis ntake bore . So its not oversize on the .46 . One thing some said - a 1 inch tall , over case , intake gives a
more stable run .