I hear that the Mangnum engines are great engines, but in all the info I see about them there is one major stat missing; power output even on Magnums website they neglect to tell you what the output is. Do any of you guys have any info on these engines particually the XLS 40 and XLS 46. Thanks

I haven't used Magnums in C/L but I have in R/C. Powerwise they are almost identical to an OS FX or Thundertiger Pro of equal size. I fly alot of R/C combat and the only real determining factor is which engine I can get parts for the easiest. SInce Tower started carrying GMS and the supporting parts, I'm trying them out this season. I hear they are the same powerwise as the others. If parts availability isn't a concern, go by price. They all run good.[8D]

Well I'am not quite sure how to take this reply to my E-mail to Magnum:

Magnum does not provide BHP figures as they are theoretical calculations and have no practical application. Each manufacturer generates them differently, so you can't even compare brands with them.

--
Customer Service
18480 Bandilier Cir
Fountain Valley CA 92708

So OS, Fox, Super tigre, Thunder tiger, and GMS to name just a few are all BSing me with their BHP numbers and Magnum is in the right by not telling me anything?....... OK Sounds like they could use someone else in the CS department because quite frankly that really does not make me want to run out and buy a Magnum engine with a response like that.

I'm not too critical of the Magnum response. A statement that an engine makes 1.7 BHP tells you very little. Horsepower is RPM times Torque times some constant. Even as statement that an engine makes 1.7 BHP at 22,000 RPM isn't too useful if you want to run the engine at 10,000 RPM. The most useful kind of test is where they tell you the fuel, glow plug and atmospheric conditions and show a torque and horsepower curve on a graph versus RPM. This is done with calibrated test props. Then they tell you what RPM they got with various props, including the ones you want to use. Peter Chinn used to publish this sort of test in Aeromodeller and Model Airplane News. I run some older engines, and I have found his tests to be very informative.

Jim

DoubleDanUgly:

I would exude no perspiration over it. Since the OS 46 FX parts interchange with the Magnum XLS 46 I think you'd be safe in using the OS numbers to apply to the Magnum.

And don't forget - not only is the Magnum less expensive, it has a true chromed cylinder, not cheap-crap nickle plate like the "Higher priced" brand.

Bill.

Doubleugly,

I kinda like the figures Fox puts out. They tell you what to expect on a specific prop with the recommended fuel. Generally, the prop appears to be the best size for most applications.

Don't discount the HP and torque figures on most engines. Although they may be off a bit, they tell you approximately what to get for your application. This can be used to tell whether it is for high speed, low speed, prop size, etc.

George