How well will a Mvvs 40 do on a Slede? Or will i need something bigger.

A MVVS 40 equipped with a mini-tuned pipe and an APC 11x4 prop is a killer setup. I had one on my Knife ARF and it hovered at about 2/3 throttle. On a lightweight kit-built Sledge (which would likely be a full pound lighter than my ARF), the engine would be even more impressive.

Irvine 53 MKIII or the Saito 72 hehehe...

The MVVS should be fine though



Steven

[link=http://rcsites.net/sf60pilot/Sldsnd001.wmv]Mine with a Saito .72[/link]

Scole, the MVVS 40 is not my choice but there has been success with the engine as long as it weighs less than 4lb. I like the MVVS .49, Jeff W.

I have a Webra .50 on mine... It totally rocks... 2 oz lighter than most of the rest of the gang.....

You must have a bad a** MVVS 40 or either a really light Knife ARF. I tried that same combo and ended up with an Irvine 53 to get my fat Knife ARF to hang.

My suggestion would be the Irvine since mine has pefromed flawlessly....maybe an oz or two heavier but power out the wazoo. But I hear that even a TT46pro or OS46FX will handle a kit built profile providing its around the 4lb range. Remember...can never have too much power but the weight is always equally imprtant.

I probably will end up with something larger, but i have kept it pretty light so far with contest grade balsa, carbon gear, small throttle servo, and some lithium batteries. It's almost done now and would like to replace the engine, royal 46, that i was going to use because of throttle transition and getting the engine to run reliable for even 3 minutes at a time. It flamed out 3 times in the last 3 flights of my profile hots, and the last wrecking the plane.

Possibly a bad a** 40, but I don't think my ARF was overly light (especially after the repairs that I inevitably made to it over time). What prop were you you using? The important thing on the 40 is not to overprop it. The engine really bogged trying to spin a big 12x4. Putting a smaller 11x4 prop on transformed it into a monster. I tried an 11x3 which worked even better, but I was afraid that the engine was going to explode WOT My Knife, RIP, was capable of just about everything in the book.

I'm now flying a Topcap ARF w/ a MVVS 49 and this motor makes the 40 look like a .061... It spins either a 12x4 or 12.25x3.75 prop around 15,000 rpm using FAI fuel. Hovers at about 1/3 throttle and pull out like a rocket.

If the 49 spins that much better, than i think i will just spend an extra $15 and get the .49.

Im pretty sure I tried a 11x4 of various brands with no luck. But I bought it used and it could been past its useful life. And I never had a good pipe for it either.

scole, if you don't have the engine, by all means, get the 49... Same (or less) weight, more power, how could you loose? The new one I got a couple of months ago from Morris, with the blue anodized head, came with a bigger carb than a good running one I have which is a couple of years old. And it was more powerful outta the box than my old one to boot!

Aw heck... If you haven't bought an engine yet... The webra .50 is best in class in this weight range... and you can get them for $125 at Lone Star Balsa.

Paul, I've got a MVVS 49 and a Webra 50. Personally, I think the MVVS is a better engine than the Webra. Not taking anything away from the Webra which is a oz or two lighter than the MVVS, I'd rank the Webra close second to the MVVS in this size range of engines, but the MVVS makes more tractable power with big props than the Webra.

Paul, I am gonna get you running that MVVS 49 yet. Jeff W.

Well... I have a MVVS .49... I'll have to strap it to my Sud and see what it can do.....

You might make a liar outta me yet!!

Paul, hows the throttle transition on the Webra?