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Old 10-20-2013, 12:00 PM   #1 (permalink)
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Default Agusta a109 motor?

Hello,

First time i make scale heli from trex 500 with 4 blade head on a109 fuselage. Is it ok to put this motor http://www.hobbyking.com/hobbyking/s...00_class_.html , because align 500mx is very hot (untouchable) with this configuration :
YGE 100A LV
2650 nanotech 65-130c 6s
ds510x3 and tail RJX FS0391THV?
and
Does anybody knows which is the upper limit for the mass of scale heli based on trex 500
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Old 10-21-2013, 01:21 AM   #2 (permalink)
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No. You cannot use that motor. That motor is for a 600 class Heli, with a 6mm rotor head shaft.

You need a 500 class motor, with a 5mm rotor head shaft.
I would suggest the HYPERION HS3026 1210 KV motor.

Use a 12T pinion and run the head speed at 1700 rpm.
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Old 10-21-2013, 02:42 AM   #3 (permalink)
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Thanks for reply,

But I was thinking this one http://www.hobbyking.com/hobbyking/s...00_class_.html
5mm shaft with 12t or 13t .
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Old 10-21-2013, 03:11 AM   #4 (permalink)
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Quote:
Originally Posted by laza View Post
Hello,
....
Does anybody knows which is the upper limit for the mass of scale heli based on trex 500
I don't have a figure for maximum mass, but I believe it is MUCH more than the mass of a painted fuselage. RC helicopters and their components are engineered for very strong g-forces in 3D manouvers, which is probably 3 - 4 times the basic mass (pod and boom). But a heavy helicopter will be less agile and have a shorter flight duration than a light one of course. Even so, in my experience where the fuselage has added 30% of the mechanics weight by reducing head speed I get flight times at least twice of those that 3D fliers get.
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Old 10-21-2013, 04:12 AM   #5 (permalink)
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You don't need a lot of power for scale flight - any appropriately sized heli motor will have more than enough power for scale because they are almost always designed for 3D.

My 500 sized UH-1N weighs about 8lbs I think, and it uses about 400W for scale circuits. Using 50W / lb of weight is a good rule of thumb, with slightly more for either 4 blade (like the A109) or hovering.

As said above, that is a 600 sized motor (and a fairly weak one at that), so it is probably a bit large to fit in the 500 frames.

Scorpion motors are not the best for scale because of the need to oil regularly. Look at the Savox 1200kV motor. I have bought a used Savox 1300kV for my UH-1N but I have not used it yet, but apparently they are quite good, and not too pricey.

I would have thought you might run a bit slower than 1700rpm for a 4 blade. I run 1700rpm in my UH-1N and it flies quite well at that (2x 465mm Spin asymmetrical wide chord blades).

Colin
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Old 10-21-2013, 09:04 AM   #6 (permalink)
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Quote:
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"...I would have thought you might run a bit slower than 1700rpm for a 4 blade. I run 1700rpm in my UH-1N and it flies quite well at that (2x 465mm Spin asymmetrical wide chord blades)."

Colin
I use the thin chord Carbon Fiber scale blades.
Four of those seem to be nearly equal to using a pair of wide chord blades.

7-8 minute flight times, on 6S 3300mah packs, and the motor is barely warmer than ambient after the flight.
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Old 10-21-2013, 09:43 AM   #7 (permalink)
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Thank You guys for replies,
Ordered Savox BSM 3750 1200KV Pro Spec 500.
For blades I will use symmetrical http://www.hobbyking.com/hobbyking/s...in_Blades.html is it ok for test flight?
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Old 10-22-2013, 03:57 AM   #8 (permalink)
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The blades should be OK. Just check that the two pairs are not too far apart in weight. With 4 blades the opposing pairs can be a bit different, but not too far out.

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Old 10-23-2013, 02:40 AM   #9 (permalink)
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Believe it or not, even though were purchased at HobbyKing all are in balance
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Old 11-05-2013, 02:08 AM   #10 (permalink)
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Until the motor arrive, I do a paint job.
No more Nemo fish http://www.imdb.com/media/rm38551577...ef_=tt_pv_md_1

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Old 11-05-2013, 02:24 AM   #11 (permalink)
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Very nice paint job!
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Old 12-01-2013, 11:03 AM   #12 (permalink)
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....almost done....

[IMG][/IMG]

[IMG][/IMG]

And lights..

[ame]http://youtu.be/hRbuGXjNMLE[/ame]
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