2.6m Jamara Ventus HX2 cog - RC Groups
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Feb 12, 2013, 10:35 AM
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2.6m Jamara Ventus HX2 cog

Does anyone know what the correct centre of gravity is for the 2.6m Jamara Ventus HX2?
I have as yet to maiden it and I'm told that these can be a nightmare to fly.
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Feb 13, 2013, 11:51 AM
Proud member of LISF and ESL
If no one answers you might consider asking the manufacturer
Feb 21, 2013, 12:27 PM
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Tried the makers web site but unable to obtain required info.
Still loking for the COG.
Can anyone help?
Feb 21, 2013, 04:53 PM
Proud member of LISF and ESL
If there is a spar or a wing rod, use that as your starting point.

If you can hand throw it, preferably over tall grass, that would be good. It should go something like this video.

> Video of a Hand Throw Test Glide
rc sailplane bird of time (0 min 17 sec)

If you can't hand throw it because you can't get a good enough grip then do it with 1/3 throttle. If it goes OK take it up. If it is hard to control, slowly power off and land it. Give yourself a LOT of room.

If it tends to sag at the tail, it is probably tail heavy, don't try to fly it.

> Test Flight Procedures

> Performance Tuning Gliders

Gordy's Balancing System

Soaring Master Class Preview 1.mp4 (4 min 1 sec)
Last edited by aeajr; Feb 21, 2013 at 05:03 PM.
Feb 21, 2013, 05:06 PM
Proud member of LISF and ESL
Here is a seller. Maybe they have some insights:

Feb 25, 2013, 02:46 PM
Registered User
Thanks for the edifying information and help you've provided.
I finally managed to get the information via a very circuitous route from an Italian gentleman working in Germany.
For future reference I can now announce that the CG for the non powered version of the Jamara Ventus HX2 is 42-46mm back from the root leading edge.
All I need now is some decent weather and plenty of lift in order to fly it from our local slope whilst praying that it doesn't tip stall and spiral to earth.
Thanks again.

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