Himax-2025-4200 and GWS Spitfire Maiden today - RC Groups
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Jan 02, 2004, 12:56 AM
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FullaFoam's Avatar

Himax-2025-4200 and GWS Spitfire Maiden today

Well it seemed about time... the weather in Cleveland and my workload has been too much lately, but I finally gave her a go.
First off, specs:
GWS Spitfire
Himax 2025-4200 with the 400c gearbox 4.5:1
9 Kan 950 cells
9x6 APC slo-fly prop (I thought it was a thin-electric!)
Cirrus MRX-4 II receiver (worked awesome! No glitches!)
6exa Transmitter
3xGeneric Servos

Anyhow, I was not expecting too much after finding the discrepency with the prop. I lauched the plane with a good toss (learned later tossing is not necessary) and after clicking my trims many times I had it going vertical for a limited distance because of my eyesight. I figured out one thing today, people who crave unlimited vertical are completely nuts! I would consider myself a decent flyer, but I guess my eyesight isn't what it was. Unless the plane has a 16ft wingspan or it goes vertical at 5mph, omg!

So everything went fine, the Spitfire didn't like how heavy I built her because the landings are more like "stall flops" but no damage.

Does anyone else run a similar setup that would give good performance in this airframe? I am getting addicted to these warbirds from gws. I only wish they were made out of wood or EPP. I hate EPS but for the money, what am I complaing about! I will post some pictures soon, the plane is out in my truck.
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Jan 02, 2004, 05:45 AM
It's a Great Day to Fly
LenBFP's Avatar
You can shed some weight changing to 650 KANs. I run an AXI 2208/34, TMM 08-3 ESC, GWS receiver and servos, eight KAN 650 cells, and an APC 8 x 6E prop. The ready to fly weight is 15.9 ounces and flys real nice. The fellows at eflightline fly rigs similar to yours, maybe they can offer some advice.


Last edited by LenBFP; Jan 02, 2004 at 05:50 AM.
Jan 02, 2004, 06:17 AM
Registered User

The Spit

how heavy is your Spitfire?

I am finishing a GWS Spit powered by MP Jet 25/35 in 400 gearbox. Until I get LiPo's it will be powered by 8 KAN's 1050.
Total weight 20 oz.

Previously I flew brushless GWS P-51 at 18 oz and thought the extra weight was not all that bad on windy days. Not sure about 20 oz, although the Spit in stock setup (I flew both the Mustang and the Spit stock first) seems to be better behaved (or do I just keep getting better :-D )

Jan 02, 2004, 08:22 AM
Registered User
TMO's Avatar
I fly mine at 13.5oz with a mpjet 25/25 and a 2s1500 kokam pack. Very nice. No rudder or gear.
Jan 02, 2004, 10:42 AM
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FullaFoam's Avatar
I forgot to mention that I purchased the setup at e-flightline. Great service/setup. Here's a stupid question: Is there a difference between APC-E props and slo-fly? I am guessing the slow fly props have more area and flex a bit more.

I still haven't weighed the whole setup with batteries etc. I will look into the KAN's?
Jan 02, 2004, 11:23 AM
Tight is Right
Darren Hintze's Avatar
In my opinion you should not go to the KAN-650's. A Himax 2025 should be pulling 13-15amps to be effective... that's too much for KAN 650's.

If you need to shed weight and still want the 2025 up front, Lipo is the only answer.

Yes, there is a difference between the APC SF and E's, and you hit it right on the head. The SF's are lighter and more flexible. With the 2025, you'll get much better performance out of an "E" prop.
Jan 02, 2004, 10:10 PM
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FullaFoam's Avatar
Yeah, I saw the amp limit on the 650's being 15 burst... no good for this motor. Lipos are not too far away from being affordable in my cheap eyes. I'll tell you what though, even with the SF prop and the KAN 950s performance and run time were VERY acceptable. Landing on the other hand was very nerve wrecking... it felt like I was coming in at 90mph and it would not slow down AT ALL! Oh well, practice practice!
Jan 02, 2004, 10:15 PM
Brunswick, Ohio
BrunswickOH's Avatar
Congrats on a great flight! I fly three Himax motors and LOVE them!
Jan 03, 2004, 12:52 AM
Tight is Right
Darren Hintze's Avatar
Another thing to check is the balance. Kans and a Himax add an extra ounce or two to the front end of a Spit from the stock configuration.

Nose heavy airplanes land fast.... My Corsair comes in real hot when I land it with the 8 cell AA packs. It's much more of a floater with the lighter Lipos... more because the balance is better than the actual weight difference.

Jan 03, 2004, 01:23 AM
Registered User
i fly a 2s2p pack of etec1200's in my GWs109. Draws about 13amps at WOT using a razor2500, 3.75GB and 10x8 prop. I fly half throttle most of the time, only using full to go vertical.

I believe the 3cell lith packs are probably a better batt for the brushless, but I get plenty of duration out of my pack. My AUW is 14oz and landings are pretty slow.
Jan 03, 2004, 11:39 AM
Registered User
I am just starting to build mine. I have the same setup as yours;
Himax 2025/4200
400 gearbox
but the battery is going to be a 3s TP LiPo.
Decided to go with the 400 gear box instead of the 300, since I am flying on grass, I have had problems with bent 300 shafts.
So I did the 400 conversion to my P51 and it worked out good. No bent shafts.
Here's a Pic..
Jan 03, 2004, 11:45 AM
Registered User
By The way that pic is of the spitfire not the 51.
Jan 04, 2004, 11:11 PM
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FullaFoam's Avatar
Looking great! I had to hack a little bit of foam to get my KAN cells to fit. I hooked up a multimeter to see how many static amps I am pulling with the 9x6 slo-fly and it was 9.8amps. I was getting very good performance with that prop because I am so used to brushed motors.

I am going to check the CG again, but I think it was about 60mm back from leading edge.
Jan 07, 2004, 12:21 PM
Registered User
Congrats on your spitfire maiden. I know exactly what you mean
about the performance of these little warbirds. My spit has a Himax 2025-3200 and a 'B' gearbox swinging an APC 10x7 and
running on a Kokam 3s 1500 lipo pack. My old eyes have a real
problem keeping up with this plane and I've been flying more
years than I care to remember. This combo really cranks. Had to
add additional locking to the top hatch 'cause the magnet latch
wouldn't hold on the down side of a split-s and I'd lose the hatch
from the speed and the g's. Sure is fun though. Hope you enjoy
your 'spit' as much as I do. Good flying.
Jan 07, 2004, 10:13 PM
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FullaFoam's Avatar
Bob - I think I need some Lasic or something new age to fix my eyes. Maybe bionics? It sure is fun though!

Here are those pics I promised!

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