ger56

Hello All ,

Top model french mvvs importer in France claims the Mvvs .77 can swing a prop 12x11 - 11500 rpm
http://www.topmodel.fr/product-detai...77-gfsr-abc-rc

I am really doubtful on this as most of the therad speaks about 10300 for a 13x8 which is less torque than a 12x11

Would those 11500 rpm with a reso pipe available with a 12x11 ?

Thanks for your comments

Ger56

pe reivers

The engine is a very strong performer. To be sure, I think you should ask Topmodel.

ger56

Hello ,

Topmodel says it's the given data form Mvvs ...

Ger56

vasek

My Feedback: (4)

I would concur with the 13x8 as I use 14x8 for the MVVS .91

ger56

I need to be fast , but also some torque
My idea would be to install it on a Sig King Kobra

12X11 _ 11500 rpm would give 112 mph

The Mvvs is more low rpm high torque ...
Ger56

pe reivers

12x11 spinning 11500 static would give you 122 mph top speed

ger56

122 mph , theorical yes but my software include drag and other parameters ....

nevertheless the purpose of the thread is to know if the Mvvs 77 can get 11500 on the ground at 0 level with a max temp of 20° C

Regards

Ger56

pe reivers

Not theory alone. Results frequently checked by radar gun measurement.

ger56

Theory not only but it depends of the plane your use Drag on the fuselage , wings , retracts , weight , weather , How much the engine is unloading in the air .....

Ger56

pe reivers

build it, and check it out.

ger56

Pe ,

As I am sure you know very well the Mvvs engine , so could you just tell me If I can get the 11500 rpm with a 12X11 .

I believe your advise should be enough for me .

Regards

Ger56

pe reivers

I honestly do not know. I never tested it myself. If MVVS states they achieved those rpm, who am I to doubt it. But since all engines and mufflers are not alike, your engine may run differently. MVVS probably used the long tuned pipe  (item 3250) to get these rpm.

ger56

Thank you for your answer Pe ,

May I ask on which engine and plane you did get 122 mph with a 12X11 running 11500 rpm checked by a radar ?

Regards

Ger56

ger56

Thank you for your answer Pe ,

May I ask on which engine and plane you did get 122 mph with a 12X11 running 11500 rpm checked by a radar ?

Regards

Ger56

pe reivers

.

ger56

You said : Not theory alone. Results frequently checked by radar gun measurement.

As you seem to have made a lot of test , I wanted the engine and plane you used .....

Regards

Ger56

pe reivers

.

ger56

I do not need any proof , I juts want to understand and know the plane and weight as this may change a lot the speed .

If you know Mvvs engine , it should have been very easy to just answer to my question on post #2

Now if you want to keep secret your test planes , there is no reason to be on a forum !

Regards

Ger56