Just waiting on delivery of a MVVS 51 rear intake, rear exhaust stunt engine and was just trying to garner peoples opinions on them.

Thanks.

A few Aussies swear by , rather than at , them . Dallas Hanna on here being one .

Ive finally figured a intake priming tube for the H.P. 40 R.P.R. will save a few hassles.
a alum. or copper pipe to intake from outboard, to use a syringe to give correct prime.
Then its either tip the nose down , or blow tube on vent, to see fuel line is primed.
For first flick starts.

Climate would affect intake type. I got 1/4 turn differance on the neddle from top cowl
off to fitted, just useing the nose intake, for the same flight r.p.m.s

Presumably if you fly in the snow youd use this ' carb heat ',
and if you frequent the Saharah Desert , a ' cold air ' intake might be usefull.
Would also be a way to choke injun , If a stiff tube from venturie went outboard,

Putting the tounge or some other extremety over this should result in depression at the spray bar.
and permit a more conventional approach to fireing the sucker up .

How much does the 51 weigh ?

At The risk of being thrown out of Stunthanger, The MVVS 49s and 51s make superb F2b diesels.

Regards,

Andrew.

I'm still looking for a '60s vintage  MVVS 5.6 RISE with "stunt" timing   (would even consider a later vintage)

Big Bear

Hi Steve,
  Looks as though I am not the only heretic on stunthanger. Seems as though Chris is more into MVVS diesels than I am! Just because you americans can't stand the perfume of diesels........................................!!!

Best Regards,

Andrew.

I don't know if the rear intake MVVS .51 is set-up the same (compression, timing etc.) as the .49 (8cc Akrobat).  If it is, you could compare it to the setup for my .49.  So far, I'm quite happy with the .49.  I even have a spare engine.



Fred

RANDY!!! RANDY!!! Did you see that???  Steve

LOl heres the problem with the "D" motors...your wife won't allow you back in the house unless you strip down and get hosed off outside, then you have to burn the clothes your wore..and no one except your flying buddy will ever ride in your car again...

At The risk of being thrown out of Stunthanger, The MVVS 49s and 51s make superb F2b diesels.

Regards,

Andrew.

    No no Andrew!!    The MVVS 51 rear intake/rear exhaust makes a fine glow stunt engine, just the way the designers wanted it.   Not only that, I have to agree with Randy about the 'orrible smell of the diseasils which would mean I'd have to live outside with the dog!

I've actually been using this model engine since 1995 and have been more than happy with it.   A bit heavy??   No heavier than many other engine setups which have been used over the years.   It's a powerful engine when used as designed, that being to run on the standard no nitro fuel with it's mini pipe exhaust.   Take into account that these engines only use 90 cc of fuel for a pattern there's a weight saving there over some of the other engines.

In saying all this, these engines are now extinct so no use looking for them over the counter.  They are only available from our stash as they become available in sell-offs.   This engine lost sales in Australia by "problems" being found by one or two "experts" who never run them beyond the bench.   The other two people in New South Wales who owned 51s during the 90s took too much notice of the "experts" and modified the engines resulting in unreliable runs.   I now have one of those engines and it's now completely back to standard form ready to run.   That makes 4 of them in my stable.    Would I sell any of them?  No, there's still too many experts here in OZ who'd wreck them for the sake of modifications because of their thoughts on how an engine should run.

HH