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Old May 12, 2004, 11:19 PM
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Himax 2025-4200 in GWS Gearbox

Hi Guys

I am looking at mounting the motor in 300 GB. I was wondering what size prop and gearing would be best for it.

I have a ESC around the 18A mark, and it will be pulling a brand new E-starter.

I have pinions (11T and 13T) and "C" and "D" spurs - what prop would you suggest ?

Thank you muchly peoples

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Old May 13, 2004, 04:01 AM
Balsa!!!
Singapore
Joined Sep 2003
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I had the same question too a while ago.

What the Ezoners suggest is a 11x4.7 on a "C" geared GWS gearbox.

Just a note, the motor doesn't perfectly fit the gearbox. You might want to ask for ways to mount it.
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Old May 13, 2004, 05:33 AM
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Ireland, Kildare, Leixlip
Joined May 2002
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What cells are you using?
The ratio and prop will depend hugely on the supply voltage.
I used this motor with 8x500AR NiCDs and EPS300 'C' (5.33:1) gearbox driving 10x8 GWS prop. Current was about 12A for about 100W. The motor is capable of much more depending on power supply and ESC. If you use 3s Lipos capable of about 17A you can get 175W out of the motor with the ESC you have if you need it.
I suggest you read through this thread Pics and Specs of new Himaxx motor V3 and the two preceeding it for lots of useful info on this motor. The 2025-4200 is a very commonly discussed motor and there are lots of threads about it. A search is sure to find the information you seek.

Aidan

P.S. I wouldn't recommend the GWS props at these power levels. I don't think they're up to it. I know lots of others are using them but that's my opinion.
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Old May 13, 2004, 06:50 AM
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Quote:
Originally Posted by orangepeel
Hi Guys

I am looking at mounting the motor in 300 GB. I was wondering what size prop and gearing would be best for it.

I have pinions (11T and 13T) and "C" and "D" spurs - what prop would you suggest ?

Thank you muchly peoples

For those of you that have RAZOR RZ-400/350 motors then, here's another way to secure your motor in the GWS EPS-300/350 gearbox. The O-Ring is available from HOME DEPOT and improves the side loads and reduces the stress on the front attaching hex motor screws!

I am sure the diameter of the HIMAX 2025 is not that far off from the RAZOR 350/400's so, this O-Ring might help things a bit.
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Old May 13, 2004, 06:54 AM
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I have my GWS PT-17 STEARMAN with the HIMAX 2025/4200 in the GWS EPS-300C "C" gearing (5.33:1 ratio) and using the APC "SF" 9 X 7.5 prop using the KOKAM 1500mAH, 3S1P, Li-POLY and WOW! 12.3 AMPs at WOT and I didn't dare fly her anymore than half throttle!

The PT-17 STEARMAN is 22 oz. AUW so, your little E-STARTER will just zing/zoom for some excellent flying!

Notice that the O-RING helps with the Spur gear and Pinion Gear lash. Very efficient and motor/battery pack comes out cool !

Carlos
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Old May 13, 2004, 06:58 AM
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RESULTS: FANTASTIC!

She flew for a short 8 minute and 19 second flight during lunch time at the Space Center and the motor/gearbox stayed in one piece finally and the landing was super smooth!
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Old May 13, 2004, 08:10 AM
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Steamboat Springs, CO.
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Check out www.lightflightrc.com
He has an adapter kit for the himax motor to fit in the GWS Gear box under the accessory link. These adapters make the motor fit very nice!
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Old May 13, 2004, 09:16 AM
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Quote:
Originally Posted by crashed2
Check out www.lightflightrc.com
He has an adapter kit for the himax motor to fit in the GWS Gear box under the accessory link. These adapters make the motor fit very nice!
Yes, I forgot to mention that this WEB based company has these but, at HOME DEPOT and even LOWES HOME IMPROVEMENT has these very same O-RINGS and they go for much less than the $7.00, say $1.86 for two O_RINGS. . If you say that the front rubber plate is included then, I say the local hobby store has these same ones made out of 1/16 ply for $3.00 and come (4) in the package.

Surely, for those that want something right away and made custom fit for the HIMAX 2025 and not go through the hassel of searching somewhere else then, perhaps $7.00 is worth it.

I fly next to a HOME DEPOT so, it's a matter of landing and allowing my batteries to charge while buddies look after the gear and I go shopping

Carlos
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Old May 13, 2004, 10:18 AM
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b-p-p.com do an aluminium adaptor which is also being sold by some other distributors.
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Old May 13, 2004, 10:38 AM
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Quote:
Originally Posted by Aio_1
b-p-p.com do an aluminium adaptor which is also being sold by some other distributors.
Exactly, that's where I obtained the Aluminium adapter for the RAZOR RZ-400 shown in the pictures in the previous post.

Carlos
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Old May 13, 2004, 04:44 PM
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It's a number 13 O ring ...... 65 cents at Home Depot.

Another good thing for the Razor motors is the "Razor Saver" It's an adapter plate that goes on the front of the Razors and is the same diameter as the GWS gearbox thereby giving it extra support. It has three mounting screws to attach to the Razor as well as the 2 standard holes to fit the gearbox (all screws included). I've put them on both of mine and they work great - no more worry about stripping the flimsy Razor screw holes. $7.00 each. Do a search on "Razor Saver Man" and you should find them.

Heres a link: http://www.rcgroups.com/forums/showt...ht=Razor+Saver

Ed
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Old May 13, 2004, 04:47 PM
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Quote:
Originally Posted by edkoz
It's a number 13 O ring ...... 65 cents at Home Depot.

Another good thing for the Razor motors is the "Razor Saver" It's an adapter plate that goes on the front of the Razors and is the same diameter as the GWS gearbox thereby giving it extra support. It has three mounting screws to attach to the Razor as well as the 2 standard holes to fit the gearbox (all screws included). I've put them on both of mine and they work great - no more worry about stripping the flimsy Razor screw holes. $7.00 each. Do a search on "Razor Saver Man" and you should find them.

Heres a link: http://www.rcgroups.com/forums/showt...ht=Razor+Saver

Ed

Thanks for the correction and info!

Carlos
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Old May 13, 2004, 05:13 PM
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I have a Tantrum powered with a himax 2025-4200. I am using the GWS 300 gearbox with the D ratio spinning an 11x4.7 GWS orange prop. This gives excellent power for this plane using 3s Etec 1200 and the current draw is only around 8-9amp.
Have a look at the spreadsheet on the parkflyermotors website as it give some useful figures for 2 and 3 lipo cells for various ratios and props.
I mounted my motor in the gearbox using the o-ring method also and this seems to support the motor very well. You have to trim the plastic wings in the front of the gearbos to allow the bearing housing on the motor to sit in but the mounting holes line up exactly. I think i used about six o-rings to support the motor in the gearbox.

Peter
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Old May 13, 2004, 05:34 PM
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Thank you for your replies.

I have a 3 Cell 11.1V Kokam 1500 pack.

I have installed a C Spur, but was wondering what a 11T or 13T would pull with a 10x8 prop (GWS) -of course with the 2025-4200 motor ?

I would like to know how to figure out these figures by my self - is there a formula, program or just using the 20A multimeter ??

Thank you for your help and replies

I cant wait to get the E-starter zinging thru the air ...
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Old May 13, 2004, 05:39 PM
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Casino, Australia
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I think you will have to stick with the 12T that goes with the c spur otherwise you will not get a good gear mesh. This has been my finding anyway.
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