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HelicopterBeginners Corner › 4 stroke ??
12-21-2003 01:42 AM  13 years agoPost 1
karsten dk

Heliman

denmark

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i was thinking if any of you had tried to mount a 4 stroke engine in
a raptor 30 v2, I would like to know, because they less noisy then the the 2 stroke - and run lower rpm's. it must be nessesery to change the gear ratio at the same time, or could i use the standard ratio ??

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12-21-2003 02:13 AM  13 years agoPost 2
capebob

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Cape Coral, FL

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In recent times as far as I know there has only been one heli specifically designed for four stroke engines. That was the Kyosho Legato and it was a spectacular flop. The Legato was designed for the OS 52 Surpass. Although it had enough power for hovering and mild aerobatics it was underpowered compared to the standard 30 size machine. Also, it tended to overheat very easily. This is the good news. The bad news is that to convert a Raptor 30 to four stroke would require a machinist. The gear ratio would have to be reduced to about 5 or 6:1 to accommodate the four stroke’s lower rpm. The spur and pinion gears required to do this are not available on the market and would have to be machined. Also, a new motor mount would have to be crafted. You may not be happy with clutch performance because of the lower rpm of the four stroke but I’m not sure about that. Oh, the fan would have to be redesigned or modified so that it would fit the four stroke and capacity would have to be increased to prevent overheating. There are probably other problem that would crop up while making the modification, they always do.

Bob

Success is the ability to go from one failure to another with no loss of enthusiasm. Churchill

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12-21-2003 02:40 AM  13 years agoPost 3
karsten dk

Heliman

denmark

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well i quess i would have to let go of the idea, but thanks anyway

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12-21-2003 03:50 AM  13 years agoPost 4
Hughes500Pilot

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Anaheim, CA

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Kalt has the 4 stroke Baron, Century has the 4 stroke Phoenix, Heim has the 4 stroke Ultra Star, X-Cell's 4 stroke uses YS 91 4 stroke and Vario has the 4 stroke Boxer. Vario's Boxer has a 27cc twin cylinder 4 stroke boxer motor. Here are a couple photos of the Vario. -Steve

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12-21-2003 03:59 AM  13 years agoPost 5
capebob

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Cape Coral, FL

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Kalt had the 4 stroke Baron and Vario has a 4 stroke heli
Sorry Steve. I forgot about the Kalt and didn't know about the Vario. I looked the Vario up and it looks great but a little pricey. About a grand for the heli and almost as much for the engine.

Bob

Success is the ability to go from one failure to another with no loss of enthusiasm. Churchill

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