I was given some advice on an engine for my Twist and a friend mentioned MVVS .49with a tuned pipe. How would this compare to a .50 OS SX?

Off topic, but how many hours can you put on an engine? After 150 hrs do you have to rebuild or is there a chance of restoring power at all?

MVVS makes a very good engine. IF the mvvs has a tuned pipe and the O.S. doesn't, I would give the edge to MVVS....they run strong.




Neo

Both the OS and MVVS are really slick motors. They are of similar weight and price as well.

Owning the .49 MVVS however has sold me! I think even if it were substantially more money than
the OS...I'd still buy the MVVS. (I hope Kozak at Morris isn't reading this...)

First class engine....loads of power, super friendly to operate.

There is no shortage of OS .50's to compare it to locally, but my MVVS shines.

Most say "well of course it's stronger....it's a .61!!!!.....It's then my duty to point out that it's actually
smaller then their .50. <GGGGG>

If you look around on this board, you will see that there are many others who's experiences
with this motor mirror my own.

Break it in carefully on the bench....slap a 12.25x3.75 prop on it and ROCK!!

Regards,

Race.

I have two MVVS engines, a 40 and a 45, they both have short pipes and really scream when propped right. The 45 is on a -4 lb. Morris Knife with a 12 1/4X 3 3/4 APC. Verticle is rather good, like forever......The 40 is looking for a new home as it lost the last one (too large for the application).
These are quality engines that put out lots of power, The 40 would most likley do well on your twist, the 45 better and the 49 great (I like the power).

I don't know what it is about the MVVS - I have a 91 and it has character! It's a quality engine and responds better with care and attention (much like another item in my life...)

Run it with a perry pump and pipe and not much will touch it.

Mick...

I think you just nailed it.

The MVVS has a certain 'something" about it that makes you want to take that model back to the field
again....and again...and again...

Just had my .49 back out again tonight, and it does make people ask questions. I'm sure it has NOTHING
to do with the one-flip starts...or the lack of needle-diddling (once set) or the unGADly output, or the tick over idle,
or the..(insert glowing adjective here).

<GGGGG>

Man, you just gotta love these things!

'Race

Race,

Yeah, after I bought ther MVVS 91 I sat it on the shelf in the living room and sat there looking at it until I finished the model. Got some comments about that, I can tell you. That might be sad but you have to cherish the moments...

As to the engine - it eats up silencers (mainly because the MVVS quiet silencer is inadequate rivetted tin plate), has this odd tendency to cut-out on rare but random occasions (that's in all different models with different tank set-ups - one with a perry pump) and can sometimes be a pig to start (I don't use electric starters). It does, however have loads of character and goes like a good-un. And it's still barely run-in.

It's these characteristics that I find appealing because, from time to time it needs "sortin'".

The ASPs I have are excellent engines: you bolt them in the plane and that's it. They start immediately, are extremely reliable, but you don't have to touch them after that. They are like Honda motorcycles - difficult to get a relationship going.

What price perfection...

Mick.

Hey Mick..

Have you checked with J'En for one of their mufflers? Being a UK dealer, their aftermarket
mufflers are likely to satisfy the more restrictive noise specs you have over there.

My .49 has the MVVS "tuned silencer" and it's not quiet, but...it doesn't attract the police
either so it's fine by me.

My MVVS .61 uses their full-length tuned pipe. Not bad on noise , and doesn't fall apart.

Some brands of mufflers with a "bolt-on" arrangement will fit the MVVS as well. For example,
the old ASP .61 (Generation 1) will fit the MVVS .61 as a drop in replacement. FYI.

Cheers!

'Race

Race,

I know the Just Engines crew - get all my motors from them these days. Trouble with the MVVS 91 was, I had already installed it in an Ultra Stick very close to the bulkhead and was kind of limited with my choice of silencer. Next model though I'll investigate the options.

I'm choked at the moment - just trashed my No. 1 model at the field this moring. A Flair Swallow - too far away, too fast, too low, wrong attitude(?) and sun flashing off the wings. As all these things start to rapidly coincide your options reduce to zero geometrically. Excellent model too. (sniff)

Might try a pipe on the MVVS next though.

Mick.

Mick,

I am sorry for your loss.
But if you fly, you will crash your model occasionally.

It even happens to the best of fliers.

My previous model crashed in a 'hidden stump' incident. After the engine was intentionally shut-off, a car came on the runway and the landing was forced in some grass, but there was an electric pole anchor hidden there...

You still have the ability to build a new model.

About two months ago, a 12 year old boy died here, after being hit in the head by carbon-fiber blades of an R/C helicopter's rotor... He suffered massive brain damage and died a week later, after all his body's systems shut down. BAD; very bad.

Dar....Thank You for the cheerful, uplifting news!! <GGGG>

Nothing like a tale of carbon fiber -vs- cranium on a Sunday morning...

(OUCH!!!!!)

Mick...see the J'En gang for your next exhaust, or perhaps Dar (I occasionally jokingly refer to him
as "Dr. Doom") could help you out.

Dar's the best for MVVS support......

'Race

Curt,

We must never forget that R/C, engines, cars and mostly anything, can become dangerous if mishadled.

Signed: Dr. Doom... OOPS!...

Sort of puts one's own miseries into perspective: It's made me feel a bundle happier...

Dangerous things those choppers - I've heard of more serious injury reports concerning helicopters lately than fixed wing. Don't know what that means, though.

We have been having a new guy show at our field with a hilo. He mentioned flying after a drink or two the past evening. No one else was there at the time apparently (according to him). I pointed out that that was not acceptable whatsoever and don't even try again. Guess he thinks i'mm the Grinch but as club president I have to say something. We fly in a state park and are somewhat limited as to who can fly and I would have to get one of the Rangers to throw him out. Safety is everything.......

Yes, I agree: In any interest group, whether it's model flying, fishing, motorcycling... etc, there are always those that are prepared to home in and shout loudly about the dangers of that particular following and why it should be banned. Without the correct procedures that we should all be prepared to maintain our sport would be at risk. And that's how it should be.

We all have a responsiblity to keep our sport safe if we want to keep on doing it.

By the way, my day job is Health and Safety manager for GKN Aerospace - and I've got as many prop scars on my hands as the next aeromodeller...

Mick.