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Mar 14, 2010, 08:03 PM
sneu's Avatar
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New stuff from NeuMotors


Here are some spy pics from the NeuMotors Skunk Werks(my garage).

The first of the new generation F5B props designed from start to finish with modern CAD and CNC. The 16/21 prop follows in path that Thomas Pils started. The new series was designed for the higher power levels and RPMs that we now operate at. The airfoil and blade design are new--thanks to the hard work of David Fee. The new blade folds very cleanly on the Avionik fuselage as a result of modeling the Avionik nose section which allowed the blade do be adjusted to fit. These are the first of the 16/21 props to arrive from Georgi.

The first flight on a 5S 1512/1D/6.7 went quite well. The prop is stalled at launch--it makes a bit of a thrashing noise--but within 15 meters the prop un-stalls and the blades hookup and the plane jumps. It was only a test flight but it looks quite good--course entry speed appears to be higher. Unlike the 17/17 prop this one does not seem to hit a speed wall--the plane appears to be accelerating the whole climb and entry. The true test will be next week when we have the course setup and can get some times on it. There is no date set for when we will actually have this prop available.

Now for motor/gear boxes and such. The 8.7 gear drive is getting close to being a running setup. It has a very small pinion gear! The helical gears should make for a low noise setup. The test version is going to be hooked up to a 1415 size motor. The gear drive is a major change from the P32--the ring gear is much larger! The output shaft is 8mm--which will be ground down to 6mm. I am hoping to have it running for testing next week. If this works out we will make them available on a limited basis. They will not be inexpensive--the gear drives cost 4 times what the P32 does

Steve Neu
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Mar 14, 2010, 08:34 PM
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Andy W's Avatar
Just for kicks, what would an entire setup cost (ESC, motor, 8.7:1 GB, spinner and this beautiful prop)?
..a
Mar 14, 2010, 08:40 PM
tic
tic
thunderscreech
tic's Avatar
I'll gladly pay you tuesday for a setup like that today.
Mar 14, 2010, 11:45 PM
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jetdryvr's Avatar
That was good Tic!!

And, Cool stuff Steve!
Mar 15, 2010, 06:01 AM
Tragic case
davidleitch's Avatar
Do we assume that the prop comes with integral spinner?
Mar 15, 2010, 07:43 AM
The props of tomorrow
Hello the prop comes like the 17,5x17,5" sets.

Steve do the test on the 1512 1D on 5S was with ICE 200 inside ?

Regards
Last edited by GeorgiMirov; Mar 15, 2010 at 08:27 AM.
Mar 15, 2010, 03:16 PM
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grobbins666's Avatar
Georgi is 16*21 the same prop eflight sells, the 17*21. Or is that new for the Avionics/Neu only.
Mar 15, 2010, 03:42 PM
The props of tomorrow
Quote:
Originally Posted by grobbins666
Georgi is 16*21 the same prop eflight sells, the 17*21. Or is that new for the Avionics/Neu only.
Hi Grob , you can compare them here :
Last edited by GeorgiMirov; Mar 15, 2010 at 03:47 PM.
Mar 15, 2010, 09:59 PM
It's alive, alive!
jfseaman's Avatar
I just want to be able to get them.

I got 1 GM 16 x 18

I want Neu prop, GM 16 x 21 and some GM spinner/hubs for +5 and strait.

When and where?
Mar 15, 2010, 11:03 PM
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grobbins666's Avatar
Looks like the Neu prop pulls less amps but is faster
Mar 16, 2010, 02:54 AM
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Mutchy's Avatar
Quote:
Originally Posted by jfseaman
I just want to be able to get them.

I got 1 GM 16 x 18

I want Neu prop, GM 16 x 21 and some GM spinner/hubs for +5 and strait.

When and where?
September this year, I guess.
Apr 24, 2010, 05:12 AM
Registered User
ScotY's Avatar
What is the advantage of the 8.7:1 gearbox?
Apr 24, 2010, 06:40 AM
The props of tomorrow
Here is what I think about the GB.
I was wondering what KV motor the Russians are using to get to 7 kw and more.

My guess is that they are using ~4500-5000 KV motor on 6S.This means they run their rotors at about 100 000 RPMs. ( I remember that Steve Neu was posted somewhere that high RPMs lead to high power).

After the rotor they are using 8,25:1 Gearbox to lower the RPMs to about 12-13000 on the prop.

The bananas with 17,7x24" will give them around ~320 km/h entering speed and over 350 when fully unloaded.

So 6,7:1 or 8,7:1 doesn't matter.It's all about the KV of the motor.
Apr 24, 2010, 06:50 AM
Registered User
Quote:
So 6,7:1 or 8,7:1 doesn't matter.It's all about the KV of the motor.
Except 8.25:1 reduces the load on the pinion teeth( same pinion but bigger ring gear) and this might be an issue at 7+kW. This also allows them to run a lower resistance winding which also could help with heat of nearly 400amps on 6S.
Apr 24, 2010, 07:03 AM
52 legs done, 53 next.
jjmouris's Avatar
Higher motor RPM giving supposedly higher efficiency.


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