RunRyder RC
WATCH
 1 page 951 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › Who is going to build me a gasser heli with the new Saito G-20?
10-23-2009 06:36 AM  8 years agoPost 1
jackheli

rrProfessor

Vancouver - Canada

My Posts: All  Forum  Topic

Doesn't this engine seem amazing to you guys?


http://www.horizonhobby.com/Product...?ProdID=SAIEG20

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 08:57 AM  8 years agoPost 2
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

My Posts: All  Forum  Topic

I think QWW
were buliding a heli to take a 4 stroke motor.looks like that motor could be fitted to a lot of nitro heli,s,the gearing would be the stumbling block as they tend to run at much lower revs but usually have lots of low down grunt(torque)

Team- unbiased opinion.K.I.S.S principle upheld here

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 01:23 PM  8 years agoPost 3
Markus

rrApprentice

Montreal

My Posts: All  Forum  Topic

I'd love to see one of the twins "gasified"...

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 04:53 PM  8 years agoPost 4
Carey Shurley

rrElite Veteran

Orlando, FL - USA

My Posts: All  Forum  Topic

well, you should of course work on what you want to work on.

but these glow motor conversions come out every coupla years. The results always seem to be the same. There isn't enough cooling surface area on the motors to support the higher heat generation of gasoline or related fuels. They work in airplanes because of the enormous amount of air moving over the fins. But they haven't been very successful in helicopters, just search back through the RR archives for data.

The fact that this is a 4 stroke leads me to believe it will be even more problematic because the lower RPM turns the fan even slower. Historically even the glow versions of 4 strokes have been marginally successful, they just run too hot. KCORDELL was one of the more succesful users having campaigned them for several years, I suspect he can chime in about his experiences with 4-strokes. They sure sound great but are tricky to make work consistently. Maybe if you put some additional electric fans on the model you might overcome the heat but then the complexity level is starting to get silly.

I think I saw an OS conversion somewhere where they basically redesigned the motor with much more cooling surface. THAT might be the ticket to make these conversions work in helicopters.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 04:57 PM  8 years agoPost 5
BeltFedBrowning

rrKey Veteran

Kansas City

My Posts: All  Forum  Topic

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 05:07 PM  8 years agoPost 6
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

My Posts: All  Forum  Topic

As you say Carey
Cooling does seem to be a major headache with this type of motor.Be interesting to see how the QWW heli pans out with the Saito motor fitted.

Team- unbiased opinion.K.I.S.S principle upheld here

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 05:27 PM  8 years agoPost 7
Justin Stuart (RIP)

rrMaster

Plano, Texas

My Posts: All  Forum  Topic

That would be a cool engine on a plank, but not in a heli. Have you ever flown a Saito on a plank? They vibrate HARD. It makes a cool sound, but the vibration is intense. The torque is intense too, but that is only good because you don't have any reduction gears on a plank.

Now a boxer 4-stroke twin would be another story...

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 05:31 PM  8 years agoPost 8
jackheli

rrProfessor

Vancouver - Canada

My Posts: All  Forum  Topic

Seems like a no-doer then...

Thanks for pitching in. We can always dream...

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 06:57 PM  8 years agoPost 9
Carey Shurley

rrElite Veteran

Orlando, FL - USA

My Posts: All  Forum  Topic

Now a boxer 4-stroke twin would be another story...
I've seen one of these fly. Peter Wales here used to have (may still). It sounded very cool. As I recall the motor didn't behave, one cylinder was always out of tune. I think there were some durability issues with the chassis too which is made by Vario.

Man did it sound good though.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 09:13 PM  8 years agoPost 10
AceBird

rrElite Veteran

Utica, NY USA

My Posts: All  Forum  Topic

Have you ever flown a Saito on a plank? They vibrate HARD.
Not my experience. They have a torque kick at low speeds because you are firing every other stroke like any four would. I would say they are smooth at running speeds. However, a four stroke is going to have much less power than a two stroke of the same displacement which is why I want to see it in a twin version. I would think a single cylinder 20 will end up being a dog for 90 size heli.

Ace
What could be more fun?

PM  EMAIL  GALLERY  Attn:RR  Quote
10-24-2009 02:51 AM  8 years agoPost 11
Justin Stuart (RIP)

rrMaster

Plano, Texas

My Posts: All  Forum  Topic

That motor would only work on a .50 sized heli. It is a very heavy motor without much power. It can't really 3D a plank. It is used mostly for scale airplanes.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 951 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › Who is going to build me a gasser heli with the new Saito G-20?
 Print TOPIC  Make Suggestion 

 5  Topic Subscribe

Monday, July 16 - 6:09 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online