22L For 3d maybe better on smaller lighter planes, Larger prop turning slower and using smaller battery packs to name a few things. But don't underestimatee the ability of the 20L on 2 cells with a 12x6 prop either. Try it...I hooked up a 12x3.8 on 2s and it pulled 13-14A and had about 100-110w and had some serious pull.

Killer

how would the 20L work on a Mini Funtana 3d?
would this be enough motor for it/
THX CAVIER.

Yes. Harley had one in his, do a search in the MF thread for performance critic. I think he said it was his second choice for power sytem after a Razor or Lehner.

Most motors would be a second choice to a Lehner. I have one and am still waiting for my A20 20L. I would hope to be so impressed with the A20 that I can use it in my Katana Mini when it ships. Otherwise I will have to get another Lehner.

My comment recommending the 22L was mostly due to the high Kv and high current values that the 20L pulls on typical 3D type of props, and even when propping down to a 9X6 the amp draw is quite high. I think I'll put it in my GWS Corsair to see how it does. It's a bit agressive for my TP1320-3S packs.

I like the idea suggested earlier, to use with a 2S pack and a 12 inch prop. I will try this on my Slow Stick with a TP2100-2S. I bet it works great!


Mike

Originally Posted by KillerAir

Gary I like the Idea of the gearbox. A cobri or Top Creations may work with mods, the gear ration is the problem, There is the Maxx prod gearsets in those rations, just don't think they can handle the juice. Love to try it out with a larger slower light plane like the Groove or a Cap 40e. A smaller E3d would be a great fit as well.

Killer

This is a thread about the Hacker A20. I just want to point out that there are geared high revving baby outrunners alread.

Here's a photo of my 78g (< 3 oz) cyclon mini elite that will spin a 10x6 at 9,300 revs at 31 amps using 10xgp1100.

I am using it in a 1.8 mtre lmr glider with 7 xgp1100 and a 13x8 (soon to be 14 x9).

The planetary gearbox is 3.7.

What would be the advantage of using an outrunner on a GB rather than a traditional inrunner? Up to now the main allure of the outrunner was the lack of GB.

Thrust for weight. Get a high power motor, particularly the ability to spin a very large prop relative to the weight of the motor.

I just tested the cylon mini elite tonight in a limited motor run application. Using 7xgp1100 its pulling 50 amps on a 14x10. I think I need to wind the controller timing down a little, but you'll agree those results are a testimony both to the motor and the batteries.

Like I say didn't mean to hijack an A20 thread. I was reading it to see if they are big enough for a 30 oz pattern plane, Top Models Dandy. Answer probably not quite.

If you do real world testing --flying 3D -you may see much different results than the theoretical limits or full power tests.
Yesterday -we ran 3 850 packs - -each flight about 10 minutes - no cool off periods -practicing outdoors with model all up weight 12 ozs on 20/20L w/10x4.7 APC.
batteries were barely warm - we did a few ballistic shots for altitude - lots of hover and vertical sink- recover stuff.
There was full throttle used only on the ballistic stuff.
anyway - the motor is very good on these small packs -light model - smaller props
I also fly with 11x7 GWS HD on 1350 pack -same results minimal heat
The static tests do show high amps - up to 18 on blips but when in motion -and light enough to accelerate easily ,the load is greatly reduced .

Originally Posted by davidleitch

....Here's a photo of my 78g (< 3 oz) cyclon mini elite that will spin a 10x6 at 9,300 revs at 31 amps using 10xgp1100....

David,
I think you accidentally used a photo of the Elite 18 instead of the Elite Mini.

Mexico,
I'm still trying to work out why there would be an advantage over inrunners. I don't know. However the figures on these motors are pretty impressive.

What is it with purple/pink/red anodised motors, they're everywhere? Surely black is better for heat dissipation

Aidan

You are seeing favorite Chinese Hacker clone colors -
black absorbs heat better ?
How does color dissipate heat?
If the metal is bare - then adding which colour -if any- assists in cooling ? I have never seen an objecive finding on this .

That's why radiators in cars are anodized purple.......

Cause it pretty

The term "black body radiation" has much less to do with the actual color of the object than with its surface characteristics. Any anodizing on the surface will greatly increase the emmissive characteristics of the object.

Anodized aluminum has an emissivity of 0.85 (1.0 = blackbody), while bare aluminum is in the 0.05 range. Basically pick your color and enjoy.

The darker vice lighter color is a different debate. But it sure looks pretty...

Brett

edit: updated emissivity values

Of course, I failed to mention that the radiative heat loss will account for somewhere around 10% of the total, so this is a minor effect anyhow.

Dick, The reason that color has no effecton the radiative properties is that most of the radiative emission occurs at very high wavelengths, far above the visible spectrum. Howzat?

Brett