I am considering a future project and I am looking at using either an ST 51 (Chinese made) or a Magnum 46 XLS.  I want to mount the engine sideways in a full fuselage plane.  I have my reasons for a side mounted engine in a full fuselage.

I want to avoid that "infamous" Fox burp in outside turns.  I recently finished a project that was powered with a Magnum 36 XLS.  The Magnum had the outside burp.  Not as pronounced as the Fox or the Stalkers but it was there.  The engine never quit but I always worried about a flameout at the worst possible time.  So, I modified the mounts and replaced the Magnum with a Brodak 40 which has no outside burp, at least none I can detect.

I considered building a plane, nothing fancy, to use as a test bed.  Probably a profile but then I wonder if the difference between profile and full fuselage would produce different engine run results.  Also, my time is better spent on other things.

Lately, at local contests, I have been watching the profile event to see what engines are running well in a profile.  Maybe that info is good enough and I can get one of those engines.  If it runs in a profile it should run in a full fuselage.  Or, is that a faulty assumption?

Since I already have the ST 51 and Magnum 46 I would rather use them.  So, do any of you know if the ST 51 or Magnum 46 will run when side mounted without the outside burp or other issues that might plague side mounted engines?  Since the Magnum 36 had the outside burp, maybe the 46 has it as well but I do not want to assume anything.

Lately, at local contests, I have been watching the profile event to see what engines are running well in a profile.  Maybe that info is good enough and I can get one of those engines.  If it runs in a profile it should run in a full fuselage.  Or, is that a faulty assumption?

I would say this is valid.
Get one of Mike Griffin's Imitation kits to experiment with motor orientation, it will be easy as it uses RC type motor mount.

Whether or not something is overpriced depends on your point of view.  If it works the way you want and need it to work, is trouble free, and long lasting, then it is worth every cent.  I am getting too old to waste time fiddling.

I have an LA 46 available but I am looking for something with a bit more power.  I think the ST 51 or the Magnum 46 would provide that.

I had completely forgotten about the Imitation.  The Imitation kit is a good suggestion.  The RC mounts make engine swaps easy.  And, I would have something to fly in the profile event.

The late Larry Cunningham used a ST G.51 on some of his Mo'Bests if I remember correctly. Perhaps some search on Larry's articles in SN or posts on SSW or SH would provide info, but I don't remember anything bad said about the G.51. Then, too, if there's a burp, a little work to reduce the bypass size, or change to a lower pitch prop to raise the rpm range and you're good. Last I flew my G.51 it was on the APC 12.25 x 3.75...because it was recommended by Dan McEntee, and it worked nicely. But it was in an inverted installation. Locally, we had PAMPA Expert Jerry Eichten show up with a G.51 in a stock Brodak P-40 ARF, and said he liked the combination.

Regarding the Magnum .46...which one, the XL or XLS series? The Magnum .40, .46 and .52 (or .53 in the earlier XL series) were all built on the same crankcase casting. The .46 and .53 use the same crankshaft. Toward the end of Hobby People, there was no more XLS .40, but I'd imagine ASP still did them. Again, if there is a burp, it's fixable.  Steve

Dan,

do you know if on a built up fuse , side mount , with the G-51 , wether just slaming the tank centered in the bearers is ' wise ' or not so ,

Ive  a few layouts , sidewinder ,( Like a F - 104 I almost pulled the drawings out last night for ) .
 the G-51'd haul nicely. If I built em . But a removeable tank gets kinda awkward . So thats held me off .
( if a removable tank it almost makes more sense to put the engine inverted , unless ones really good at removeable tank hatch covers  )

I think our Kiwi Fox Frieds Missus has a profile sidwinder g 51 Cardinal , maybe Mr Wimmer will step in .

Jim ,

if the bolt holes are close , maybe theyd BOTh go in o.k. ,

p.s. you havnt lived untill youve tried a black Tornado 3 blade 10 x 6 on the G-51 .  works a treat,
itll sound like its going to blow the top of the motor if you try the 10x4 3 blade . Lucky Ive got a G 40 & G 45 too  , same fit .

p.s. a 12 x 5 top flite wood trimmed to 11 5/8 "  is likely better for milder living .

p.s.s.  really cunning and you can get the whole fule load inside ( of ) the spraybar , with the stock intake . deep 4 stroke  low , grunt up high .