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12-28-2008 05:44 AM  8 years agoPost 1
SPITFIREMK117

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FRANCE

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Hi,
I think those two engines should be interresting for gas conversions:
MVVS 26 cc
MARK ( MOKI) 135
Have somebody tried ??

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12-28-2008 01:47 PM  8 years agoPost 2
smallplanes

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S.C. ,SSA

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Well it looks to me that there allready converted. You mean to try and fit them in a heli.

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12-28-2008 02:49 PM  8 years agoPost 3
shawmcky

rrElite Veteran

Isle of Wight,United​Kingdom

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Engines for conversion

I can see where you are coming from with your comments about the trusty Zenoah,it does not represent state of the art technology as far as weight and output.If a manufacturer did come out with an up to date version of a gasser motor it would probably move things on to the next level.Im sure that there must be an engine producer capable of building an engine for a heli,but at the end of the day it has to be cost effective.Till then i think we are stuck with the old faithful.

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12-28-2008 05:17 PM  8 years agoPost 4
mcfast

rrKey Veteran

Quebec Quebec Canada

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I heard that the MVVS had a lot of problems.

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12-28-2008 05:34 PM  8 years agoPost 5
Blade_Master1

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Canada

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check out this link
nitro to gas conversion
http://www.rcuniverse.com/forum/m_7...e_1/key_/tm.htm

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12-29-2008 01:00 AM  8 years agoPost 6
bosshoss

rrVeteran

Chicago, IL

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every MVVS 26 I have seen, 4 of them, have been flawless. Now they are branded by Evolution. .

I have flown a Yak-54 with a CF pipe and a MVVS Red head, it just rocks.

Eventually , I would hope , one of the big engine Manufacturers in the plank world will Heli-convert one of thier motors.

But, the best Plank motors, IMO, use reed induction, and that is simply a waste in the heli world. Our engines are ported for top end.

The bene's of reed induction are smooth-quick low speed response. Much lower than would be used for Helis, IMO.

But a bullet proof piston port design by Desert Aircraft would be a top contender-popular choice, in no time.

Their reputation precedes them. A 3W, or BME would be well received as well.

I would certainly take notice. I use 3W , BME, and DA in my planks,also Zennies...and the Zennies are like Timex watches....

More choices, more fun.

Why Hover a Yak, when a Heli does it better?

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12-29-2008 01:14 AM  8 years agoPost 7
Fixit

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UK

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can see where you are coming from with your comments about the trusty Zenoah,it does not represent state of the art technology as far as weight and output.If a manufacturer did come out with an up to date version of a gasser motor it would probably move things on to the next level.Im sure that there must be an engine producer capable of building an engine for a heli,but at the end of the day it has to be cost effective.Till then i think we are stuck with the old faithful.
I think Billme is testing a new Heli engine and from what he said it’s going to be a big improvement on the 231 range but I guess we will just have wait for more news on this engine.

Any News Bill

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12-29-2008 09:18 AM  8 years agoPost 8
shawmcky

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Isle of Wight,United​Kingdom

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Engines for conversion

The MVVS or Moki motors conventional glow engine layout,with the ignition pick up mounted on the end of the crank,i think is the ideal layout,as it is compact,a lot lighter than the "Zen" and uses conventional mounting points.I expect most gasser owners would prefer a pull start .Some of the "zen" engined helis look like the engine mounting designs were an afterthought(Not All).The glow type layout would certainly clean the look of the heli up as well as saving weight.Of course where the "Zen" would take a lot of beating is in the reliability stakes as i would imagine if you own a gasser(especially if a camera ship)you certainly need that.I am suprised that Webra never continued trying to iron out the problems with their design

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12-29-2008 01:06 PM  8 years agoPost 9
Blade_Master1

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Canada

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In reference to using a pull start aside from the extra weight wouldn't pulling on the crank, be hard on the frame and skids?

I would like to know before I buy a gasser later on

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12-29-2008 01:14 PM  8 years agoPost 10
nivlek

rrProfessor

Norfolk England

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The problem that I see with the MVVS is a lack of cooling fins. Petrol engines run much hotter than glow engines , so need more cooling .
In a heli , the only way to get enough cooling is with loads of finning on the head and crankcase - like a Zenoah .

At the end of the day , it gets dark .

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12-29-2008 01:16 PM  8 years agoPost 11
shawmcky

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Isle of Wight,United​Kingdom

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Pull start

Using a hex start on a large capacity engine in the way one would start a glow engine can also load a lot of the engine ancillaries and airframe to an extent as well.Anyone that has owned a 90 knows what a bitch they can be to start at times.I think a lot of gasser pilots like having a pull start so not having to lug around starting equipment.The pull start could be geared to give an easier starting experience and be quick release as has been done before if weight is a factor.

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12-29-2008 01:22 PM  8 years agoPost 12
shawmcky

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Isle of Wight,United​Kingdom

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Cooling

From what i have read,it appears that the cooling is the biggest issue with these motors.

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12-29-2008 01:26 PM  8 years agoPost 13
Billme

rrElite Veteran

MS

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This configuration blocks cooling air...The reason the webra didn't work is because of the cooling..People putting them in machines with a 60 size fan and clutch..All they need to do is have more cooling fin area, and put in a machine that can handle the engine by putting the right fan and clutch system...

I still think the Zenoah is the best we have..All mechanics are designed around it..Don't give up on it, we are just now getting it right...
I can't tell you guys enough about how this new fan has helped on the Zenoah..I'm sure manufactures have noticed too, and will gravitate towards this goal...Century, and Vario seem to be the ones who are listening, and doing something...

EI on the Zenoahs is really lite....That realy makes a difference...If Rajas jewel can handle the EI in conjuction with his present setup sharing one battery, will be what we have wanted...

We have a vib on the engine I'm testing...Wally has a handle on it, so I'm not worried...Going to change a few things.. That is what testing is all about. the power is still unbelievable...

Bill

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12-29-2008 01:38 PM  8 years agoPost 14
bosshoss

rrVeteran

Chicago, IL

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All good points.

Definitely a Heli-head design is needed.

The pull start on the current Zen motors is fine. I notice mine gets tight (of course) if I prime it too much. This is from my unablility to choke it properly, so I punch the little primer bulb.

On these motors installed in planes, they flip very easily. And being battery ignition , start very easily once choked-farted.

So, I say leave the primer bulb off.

Also, the CM6 plug takes up a lot less space than the current stock 231 size.

There are so many trade-offs between ignition systems, it could be debated endlessly.

Mag=endless running Bat=finite flight time or Jewel needed.

Mag=flywheel based...smooth? Bat=no flywheel..faster response + vibes

Mag=fixed ignition curve Bat=heli-specific tailored ign curve

No doubt, a performance based, heli specific ign curve, lightened or no flywheel, motor may be a good 3D enhancement.

But, I would be willing to bet that the Zen-mag motors will be camera ship motors for the forseeable future.

I still want to try a hot rod motor for my Spectra, while the Hanson or TRM motors are the current choice, I would be willing to try an ignition based hot rod. No doubt.

Why Hover a Yak, when a Heli does it better?

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12-29-2008 01:39 PM  8 years agoPost 15
shawmcky

rrElite Veteran

Isle of Wight,United​Kingdom

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New Engine

Hi Bill,be nice to see the old Zenoah moved up a gear,any pics yet?Be nice to have a gasser with an awesome power to weight ratio.Happy new year to you,maybe 2009 will be a big step forward for the gasser.Hope the development all comes together.

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12-29-2008 01:49 PM  8 years agoPost 16
shawmcky

rrElite Veteran

Isle of Wight,United​Kingdom

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Pull start

Has anyone else tried the Easy start system that Hanson supplies,i use one on my 26cc PUH motor and the difference is quite noticable.The better gearing takes some of the strain off the frames when starting.

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