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Old Feb 02, 2004, 05:40 PM
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Best brushless power system for a Switchback

Hey guys,
I am relatively new to the hobby and getting ready to buy my first brushless setup for a Switchback sport (I also have the 3d Wing). What is a good brushless setup for a switchback? I was looking at the Himax motors. Any suggestions. Also, I would like, if possible, to buy a setup that could be used in future planes. I plan on purchasing a tantrum at some point and maybe an SX2 or similar. I will be using lipos most likely, probably a 3s pack. Thanks for any input
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Old Feb 02, 2004, 08:20 PM
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Athens, GA
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I'm really new to the brushless scene myself, so take my words with a grain of salt.

I just put a Himax 2015-4100 in my Dandy Sport. It runs on 3s packs and is situated in a GWS "D" gearbox. I've tried 10x7, 11x7, and 12x6 props. It's awesome. Very fast. You can't keep it a full throttle for more than a couple of seconds because it is so fast. It goes about as fast straight up as it used to in level flight with the old motor.

I chose this motor because I wanted to get something flexible that I could use in a number of planes. I am thinking about getting a Tantrum as my next plane, and this setup should work well in it.

I've ordered a "C" gearset that I'll be trying soon. I think it will be a better match for this motor than the D gearbox. I'll post after I get to spend more time with both setups.

Anything that works well in a Dandy should also work well in a switchback since they are so similar. There is a great thread called "silent afterburner for Dandy Sport" that you should check out, where fantastic results were posted using the AXI 2212/34 motor.

I spent a lot of time trying to decide between these two setups. I went with the Himax because:

1) cost
2) flexibility in using different gear ratios and prop sizes
3) protection offered by the gearbox

Matt
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Old Feb 02, 2004, 08:51 PM
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Thanks Matt. Good report and good luck with the C gearbox. I think that is probably the way for me to go also.
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Old Feb 02, 2004, 11:44 PM
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United States, FL, Cape Coral
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Use the 2025-4100 Himaxx in a GWS 4.43-1 box, 10-7 APC..much better performance for the Switchback

I used a Hacker B20-15L 4-1 which is very sim to the Himaxx 2025-4100 in a 4.43 box

Mike
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Old Feb 03, 2004, 08:28 AM
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Thanks Mike. So any other input as to whether the 2025 or the 2015 is best?
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Old Feb 03, 2004, 11:08 AM
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Ireland, Kildare, Leixlip
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There is no '2025 4100' it's '2025 4200'.
The 2015's are rated for approx 100W max power, the 2025's are rated about 175W. The motors are the same diameter but the 2025 is longer and a little heavier ( about 15g (.6oz)in the difference). The rated max currents of the two series are also different. I think the 2025-4200 is okay to 25A (or maybe it's 20A).
If you'll be flying planes in the 225g to 375g (8oz to 13oz) range the 2015-4100 would probably be perfect.
If your planes are likely to be more in the 375g to 575g (13oz to 20oz) range then the 2025 might be better.

I bought a 2025-4200 recently for a 415g 3D style plane. It flies great at around 105W so a 2015 would have managed but I have the option of using more power if I want to set it up differently.

Aidan
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Old Feb 03, 2004, 11:13 AM
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N.J.
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How does the 2025-5300 compare to the 2025-4200? Just curious, I haven't found a whole lot mentioned on the -5300.

Chris
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Old Feb 03, 2004, 11:50 AM
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Have you read through this thread and its predecessors?

Himax pics and specs etc....

Should give you a good idea of the relative merits of the different motors.

Aidan
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Old Feb 03, 2004, 12:58 PM
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N.J.
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Thanks Aidan! Took me awhile to scroll through all of those posts but Darren (aka, Melfsmite) is using one & it sounds like it's a monster!
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Old Feb 03, 2004, 04:14 PM
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United States, FL, Cape Coral
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Quote:
Originally posted by Aio_1
There is no '2025 4100' it's '2025 4200'.


Aidan
OOPs your right..I think the KV rating on it is 4100 something which is close to the Hacker B20-15L

Go with the 2025-4200 you`ll be glad you did

Mike
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Old Feb 03, 2004, 05:02 PM
BEC
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Auburn, Washington USA
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If I were doing it today (and I am, as I have another SB under construction), I'd put an AXI 2212/34 on a Stevens mount in it. 3s LiPolys, 10x7SF APC prop. 95W in, and virtually silent!
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Old Feb 04, 2004, 07:51 AM
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Mike,

Yes the second number refers to the RPM/V, however they've been rounded off to the nearest 100. I think the 4200 is actually 4166 RPM/V and likewise the 5300 will be close to but not exactly 5300 RPM/V.

There are also a number of outrunners that might be great for this plane. Typhoon, PJS & AXI among others all make suitable units.
I like the flexibility and crash protection afforded by a geared high KV motor. However if I was getting a motor specifically for small lightweight 3D type plane I'd definitely consider an outrunner (in fact I'm considering just that). They're simpler and quieter and possibly cheaper when you take the gearbox into account.

Aidan
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Old Feb 05, 2004, 11:23 AM
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I am leaning towards the 2025-4200. I am assuming a phoenix 25 for the esc. What lipo pack would be the best for this setup? I have 2s Etecs now but I would think 3s would be better. 3s etec? or would something else be better?
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Old Feb 05, 2004, 11:47 AM
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How about the Kokam 340SHC 3S3P

According to the specs this gives you:
11.1V nominal voltage
1020mAh capacity
20A continuous current
3.3oz pack weight

Thats about 200W continuous output for only 3.3oz.
A bit pricy though!

Aidan
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Old Feb 05, 2004, 12:02 PM
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That may be a little out of my budget. Any suggestion for a normal 3s pack. What gearing and prop would work best with the switchback?
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