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HomeAircraftHelicopterAerial Photography and Video › Trex 800E Tail boom
08-13-2010 10:15 PM  8 years agoPost 1
vadmcse

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Barcelona - Spain

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Here are some pictures of my home made tail boom for my TREX800E project.
The tail boom is 120mm longer than the stock one so it will swing up to 830mm blades.
I made it with a 3€ 22mm aluminium broomstick.
I did some cuts on the ends to fit, since the stock boom is 21.6mm diameter.
Now it fits perfect!
For the torque tube, i bought an aluminium tube.

Compare it with my Swift 16

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08-13-2010 10:30 PM  8 years agoPost 2
TrevJonez

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St.George, Utah - USA

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make sure you have some good boom support i don't know if i trust those slits or not.

Who cares... its just money...

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08-14-2010 02:49 AM  8 years agoPost 3
Aeria Photo

rrApprentice

Montreal, Quebec - Canada

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I would not trust a broom stick for a part as vital as the tail... my opinion tho

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08-14-2010 07:21 AM  8 years agoPost 4
vadmcse

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Barcelona - Spain

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Thanks guys for your opinion.
I'll test it hardly.

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08-14-2010 10:48 AM  8 years agoPost 5
Helicek

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istanbul - turkey

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hola vadmscd,
here is how I extended the trex 700 boom to take 80cm main blades:
Cut 20mm alu tubing to proper lenghth.
Cut 2 x 30mm length pieces from an old 700 boom.
Epoxied the 30mm pieces to both ends of the 20mm tube.
Drilled the necessary guide hole and it was finished.
I also used 8mm alu tubing for the torque rod. I had to fabricate sleeves for 8x16 bearings (3 in total). I then used the alum couplings from the original torque tube. I had trouble getting the 8x16 bearings on the 8mm alu tubing. For some reason the tubing was 1/10th of a mm too large in diameter
I had 20 flights with this setup and it looks OK.
Cheers,
Ahmet

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08-14-2010 03:33 PM  8 years agoPost 6
vadmcse

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Barcelona - Spain

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thanks Ahmet.
I'll first make some tests with this, and if go wrong i will do the same as you.

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08-16-2010 07:38 PM  8 years agoPost 7
vadmcse

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Barcelona - Spain

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OK boys, here i go.

I didn't test it yet, but i was thinking a lot about using a broomstick as a tail boom.

Take a look at my professional drawing :

When you use a broom, you apply forces in A and B directions, and get a resistance C (the floor)

If you want to bend the stick in normal use, you have to apply A and B forces while completely block the broom movement.

Anyone can explain how this forces, or similar, are applied during sport / AP flying?

Is there anything that i'm not considering?

thanks

Víctor

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08-17-2010 03:40 PM  8 years agoPost 8
vadmcse

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Barcelona - Spain

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Anyone?

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08-17-2010 05:12 PM  8 years agoPost 9
GyroFreak

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Orlando Florida ...28N 81W

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You can buy all sorts of aluminum tubing from McMaster-Carr. Diffrent thickness are available. Thats what I used to extend my Razor 600E to handle 720 mm Mains.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-17-2010 06:15 PM  8 years agoPost 10
Helicek

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istanbul - turkey

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vadmcse,
any alumin tubing is ok as tail boom on our AP helis. Usually the 20mm OD alu tubing I find in Istanbul is not perfect. That is; it is soft, wall thickness is nr 1,5mm, not perfectly homogenius, not even 100% straight and therefore it is heavy when compared to one from say Align, Vario or other.

But what it does is that it keeps the tail rotor where it is supposed to be. As long as it is properly supported it will do the job. I guess I have used your "broom stick" type material since day 1 and no problem.

You know
Ahmet

By the way I can not pronounce your name.

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08-17-2010 07:35 PM  8 years agoPost 11
vadmcse

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Barcelona - Spain

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Gyrofreak:
Thanks, but when i looked at Mcmaster i didn't find the size i looked for.

Ahmet:
I'm very happy with my broomstick, i saw a lot before buying this one, and this is really light, straight, well finished and seems to be strong.

About my name, VADMCSE is my nick that i use in forums, my name is Victor and VADMCSE is an acronym for: Victor Andres Dominguez Microsoft Certified System Engineer

many thanks

Victor

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08-18-2010 11:12 AM  8 years agoPost 12
Helicek

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istanbul - turkey

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Hi Vadmcse,
with a name like "Victor Andres Dominguez" you got to be good.

Cheers,
Ahmet

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08-18-2010 01:43 PM  8 years agoPost 13
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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vadmcse
Glad it is working out for you. Does the TT support bearing fit OK ? Are you going to add more support bearing for the longer length ?
I love the creativity of finding material made from non-related objects. (Broom handle => tail boom.)

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-18-2010 01:52 PM  8 years agoPost 14
vadmcse

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Barcelona - Spain

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Gyrofreak:
Yes, the bearings fit ok and i'm planning in adding another one (3 in total)

Thanks,

Víctor

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08-18-2010 01:57 PM  8 years agoPost 15
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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One more thing, better buy a few extra brooms for spares. The store may switch brands of the broom then you may not be able to get the same tube for replacement.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-18-2010 02:16 PM  8 years agoPost 16
vadmcse

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Barcelona - Spain

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Yes, you are right.

if everithing works ok, i'll do.

Thanks.

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