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HeliProz . ZoomsHobbies . HeliHobby

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Aerobatic FAI F3C Contest > F3C hovering - wind into tail
 
 
yapjy
Key Veteran
Location: Singapore

Hi,
I'm finding difficulties in maintaining a stable hover when the heli is tail into the wind.

The canopy seems to act like an air scoop and this upsets the hovering. If it's nose into the wind, the hovering is excellent.

I'm wandering what do you guys do to have a stable hover when the heli is tail into the wind. Assume the heli is a pod and boom, i.e no fuselage.
12-19-2005 Over year old.
 
 
panzer
Heliman
Location: Falkoping, Sweden

Hi

I dont think this issue have with the canopy to do, I think its more of a question of rotorhead design. Myself and a buddy have done a bit of experimenting regarding this problem and we have found out that some rotorheads are more prone to be unstable when hovering tail into the wind. An example: My buddys Eagle 3 with the original SSR-7 head had severe unstability problems when hovering tail into the wind, then he changed the rotorhead to the SSZ-II head and the problem was reduced by, lets say 80%. We have also found out that the FFZ-II head (plastic version of the SSZ-II) is even more stable than the SSZ-II head when hovering tail into the wind (thats why I´m running a FFZ-II head on my FAI machine). On the other hand, the SSR-7 head works muck better than the **Z-II heads in the flight manouvers, and that can be intresting now when the K-Factors are removed.

Andreas
12-19-2005 Over year old.
HOMEPAGE  
 
 
yapjy
Key Veteran
Location: Singapore

I'm using the FFZ-3 (Freya Evo rotorhead).
Yes, with the changes in K factor for hovering, the emphasis is now on aerobatics. However, a good hovering will still impress.

Strangely, my team mate SSR-7 rotorhead hovers quite stable tail into the wind. However, he has a black shark fuselage on.
12-20-2005 Over year old.
 
 
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Aerobatic FAI F3C Contest > F3C hovering - wind into tail
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