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Aerial Photography and Video > How to strech a t rex 700?
 
 
cranester
Key Veteran
Location: Bogota, Colombia

My Posts This: Topic  Forum		Anyone know what parts are required?

I did some searching but could't find anything

Juan Crane
11-03-2009 04:27 PM
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papatango
Veteran
Location: Toronto, Ontario, Canada

My Posts This: Topic  Forum		Hey Cranester,

Before you stretch, read F1Rockets thread in the F3C section about his e-rex 700, and the difficulties he had setting up the head at slow speed. I think if you run 800-830's at lower headspeeds, you might get some performance issues.

http://rc.runryder.com/helicopter/t550091p1/

http://rc.runryder.com/helicopter/t476743p1/

Also, check the dimensions on the 700 for tail clearance, you might be able to swing 790's in gentle flight without hitting the tails....

Hope it helps!
11-03-2009 04:50 PM
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cranester
Key Veteran
Location: Bogota, Colombia

My Posts This: Topic  Forum		Thanks papatango I will check that

Juan Crane
11-03-2009 04:58 PM
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PhotoShip One
rrAdvertiser
Location: Arizona & Taiwan

My Posts This: Topic  Forum		I concur about the low headspeed on the stock T700 head. Below about 1500 and it begins to wobble. It's just too stiff. I ended up converting to a Raptor 90 flybar head in order to turn slower RPM (1300). I did not stretch it though so I can offer no advice on that subject.

Design Team - PhotoShipOne
11-03-2009 05:07 PM
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cranester
Key Veteran
Location: Bogota, Colombia

My Posts This: Topic  Forum		Yeah You are probably right about the head, I remember I had some issues with that when I first set it up, maybe it's better to leave it alone and not make it angry.

Juan Crane
11-03-2009 05:12 PM
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vadmcse
Heliman
Location: Barcelona - Spain

My Posts This: Topic  Forum		Hola Juan,

I'm building my T700, and i'm planning to stretch it too.

I was looking for some info, and found this http://rc.runryder.com/helicopter/t512978p1/

I don't like the way he stretched the tail boom, so looking for aluminium tube in that diameter i found that here, in Spain, the esxtension pole used for painting and a simple broom uses this diameter.

For the torque tube, i'm thinking in use carbon fiber tube to replace the original.

good luck with your conversion.


Victor
11-03-2009 05:49 PM
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cranester
Key Veteran
Location: Bogota, Colombia

My Posts This: Topic  Forum		Gracias Victor!

Juan Crane
11-03-2009 06:23 PM
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cranester
Key Veteran
Location: Bogota, Colombia

My Posts This: Topic  Forum
Quote 
Also, check the dimensions on the 700 for tail clearance, you might be able to swing 790's in gentle flight without hitting the tails....

Hope it helps

Where do I find that blade size?

Juan Crane
11-03-2009 06:31 PM
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papatango
Veteran
Location: Toronto, Ontario, Canada

My Posts This: Topic  Forum		http://video.helifreak.com/?subpath...e=700manpdf.zip

Sorry for the forum link, it's just the 700 manual.

Cheers,

Patrick
11-03-2009 08:15 PM
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borneobear
Veteran
Location: Kuala Lumpur, Malaysia.

My Posts This: Topic  Forum		One way of extending the boom is using a motorized tail.

For my stretched 600 to 700 parts include:

1. Extended motor shaft (got it done at a local firm)
2. 910 kv brushless motor (after many trials, found this to be the best kv)
3. Align 75 amp ESC (did not use governor) + extension for the 3 output wires (don't extend battery wire!).
4. 4S1P lipos.
5. Bolted motor directly onto the Trex 600 plastic case.
6. Stock Trex 700 boom.

Very low power consumption, and motor comes down warm (not hot).
Don't see why this won't work for a 700 to 800 stretch.

Of course, the main rotor head issues need to be solved first.
11-04-2009 12:42 AM
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c130pilot
Senior Heliman
Location: Windsor, CO

My Posts This: Topic  Forum		Documented stretch of a 600 to a 700 with photos and parts required (also converted to A123, but just ignore the power system part if you're sticking with lipos.)

http://www.aplanding.com/forums/sho...&highlight=trex

Tim

Help! I'm umop apisdn
11-07-2009 06:50 AM
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