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HeliHobby . Ron’s HeliProz South . Century Helicopter

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HIROBO Freya - Sceadu - Shuttle > Evo 50 w/ YS50
 
 
THX1138
Elite Veteran
Location: Plainfield, IN

What is a good headspeed for this combo? I used to run 2K on an OS 50 Hyper. Where is the happy spot for the YS?

Lou

Bowstrings, Banjo's, and Birkenstocks.
07-21-2008 01:23 PM
 
 
helicopterMark
Veteran
Location: Rumson, NJ

I understand 17,000rpm to be a good speed for this engine from what I have heard. assuming your evo 50 uses the stock 8.7:1 gear ratio that would be around 1950.

you could probably push it to 2000rpm if you really need it which would push the engine rpm forward to 17,400 which would probably be a little taxing.

Not an engine expert, perhaps one will chime in, just wanted to give you a rough idea since you don't have any replies yet. best of luck!

M3

Mark Schneider
Team MRC/Hirobo
Turbulence D3, Evo 90, EVO 50 EX
07-22-2008 03:33 AM
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Jafa
Elite Veteran
Location: Sydney, Australia

17,000 is peak power in the OS 50
We want the head speed such that the engine RPM
is above the peak and when we load the head
the engine RPM falls back to peak power
400 to 600 RPM above peak power is a good place to be

Max RPM for these engines is 20,000 so no problem there at all


Lepton | TRex600Nitro | Sceadu | Freya | Avant | Predator Carbon Max
07-22-2008 03:58 AM
 
 
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MTA Hobbies . Model Rectifier Corp . Heli Wholesaler

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HIROBO Freya - Sceadu - Shuttle > Evo 50 w/ YS50
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