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HelicopterMain Discussion › evo 50 with os 50 info
05-07-2005 01:16 AM  12 years agoPost 1
super 3D

rrNovice

Ireland

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im tuning my os 50sxh with mp2 and i can't tune the engine to get lots of performance and keep the engine really cool. At the moment the evo is lots of fun lots of power but i think the engine is to warm. When Im finished a flight i can keep my hand on the back of the engine for about 8 seconds before i have to take my hand away. is this normal.the head speed seems to be screaming but the evo seems to performe very well with this massive head speed its alot of fun. im really wondering does everbody have the evo's head speed screaming and the engine pretty warn after a heavy 3d flight.

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05-07-2005 02:39 AM  12 years agoPost 2
3d type

rrVeteran

Bridgeport,CT USA

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evos like to be run around 1900 head speed for 3d, if you can keep your finger on the back plate for 8 seconds you should be fine.

how'd the ground come up like that ?

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05-07-2005 02:43 AM  12 years agoPost 3
MJWS

rrKey Veteran

Airdrie, AB - Canada

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8 seconds on the backplate certainly isn't hot. Most of us are aiming for around 3 on an os50. There should be more HP available should you desire it.

The answer to does everyone have the engine screaming is: NO.

Even at 2K on the head the engine is only spinning around 17K which is right at peak HP. You don't need to richen it. You need to adjust your throttle curve until the headspeed is consistent and reasonable. Cyclic mixing or a gov will help with the overspeeding.

A tach or a friend with a calibrated ear would really be useful.

Good Luck,

Mike

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05-07-2005 06:39 AM  12 years agoPost 4
Gearhead

rrMaster

Vt

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I agree,,, from what you say, your motor is not to hot, leave it tuned for the 8 seconds..

Jim

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HelicopterMain Discussion › evo 50 with os 50 info
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