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Old Apr 11, 2008, 04:44 PM
nsg
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Yardley, PA
Joined Sep 2006
4,154 Posts
I use a GWS HD1060x3 on my belly-lander Corsair. No problems so far. A belly-lander GWS40 would have at least as much ground clearance, if not more.
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Old Apr 11, 2008, 10:35 PM
Dance the skies...
Tom Frank's Avatar
United States, MA, Walpole
Joined Dec 2003
17,528 Posts
Quote:
Originally Posted by rc808
Cool. Did you protect the bottom somehow? Any pics? Thanks
All I did was run a strip of 2 in. clear packing tape from the nose to aft of the wing. I also did a mod to the bottom portion of the cowl by epoxying a 1/8th in. balsa bulkhead horizontally across the bottom, then cut a piece of EPS foam to fit in the space snugly between the bulkhead and the bottom of the cowl. A little PU glue to fill in the gaps and hold the foam plug in place finished it off. I posted a pic of this in one of my posts early in this thread.

I really don't think a decent belly landing needs this, but I had a slow speed stall and rollover nose in on a landing attempt that hit on the lower cowl in soft grass, and it survived intact, except for popping out the small retaining pin on one side.
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Last edited by Tom Frank; Apr 12, 2008 at 10:40 PM.
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Old Apr 21, 2008, 05:02 PM
but it's a nice obsession
jgmtens's Avatar
Sandy, Utah
Joined Apr 2003
1,049 Posts
I just finished building and flying the P-40 and overall I would say "well done."
The only thing I didn't like was the decal set - I wish you had stayed with the vinyl stick on type instead of switching to waterslide. Waterslide decals just don't hold up well so you have to cover them with tape or spray on a protective coating. With the vinyl ones you just put them on and they are fine. Please go back to the vinyl decals like you had on the Zero and Bf-109 - not the thin ones like you put on the Slow Stick now.
BTW the color on the U.K. roundels should by dark blue, not purple.
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Old Apr 22, 2008, 12:28 PM
Registered User
Evansville Indiana
Joined Aug 2006
230 Posts
Just ordered a P-40 and was wondering what everyone thought of using this setup?

himax 2816-1220
milehigh 3s 2200 lipo
GWS 35A esc
hitech HS-55 servos
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Old Apr 22, 2008, 12:44 PM
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brati4's Avatar
Wichita,Ks
Joined Feb 2007
2,075 Posts
Quote:
Originally Posted by dellavex
Just ordered a P-40 and was wondering what everyone thought of using this setup?

himax 2816-1220
milehigh 3s 2200 lipo
GWS 35A esc
hitech HS-55 servos
I currently have a GP Rimfire 1250 on mine and its OK. I was told this is a good setup and this is coming from someone who has 3 of them.
http://www.rcgroups.com/forums/showt...40#post8673655

Here is a link to the setup. I was told use the 5.33/1 gear with a 11x7 prop.
http://epyaya.com/product_info.php?c...oducts_id=2156
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Old May 02, 2008, 05:51 PM
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glaros's Avatar
Greece
Joined Apr 2004
194 Posts
Maidened!

Maiden my GWS-40 a couple of days ago and everything went fine.

At take-off it wanted to turn left and it turn out that it was not due to torque but rather than the tail wheel not properly aligned. Anyway, almost instantly the tail is not touching the ground and the plane takes off quite scale like.

In flight minimal trim was necessary and it flew scale and stable at 1/3 throttle. I tried same simple aerobatics, loops, rolls and split-s are a piece of cake. Landing was also uneventful, except one nose over with no damage.

Overall I am very pleased with the kit, great improvement compared to previous GWS kits. I am also happy with the looks of my bird, especially considering that it is was a white NPS version painted with a brush.
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Old May 07, 2008, 11:50 PM
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sinkinpat's Avatar
Sacramento area (Lincoln)
Joined Sep 2002
348 Posts
http://epyaya.com/product_info.php?c...oducts_id=2072

this gearbox produces 25.7 Oz thrust @ 8.1 amps. according to their table you need 50% thrust to fly. for a sport plane you need 75% to 100% of the overall WT to fly sport. This is all with an 11X7 prop. Not to mention 20 bucks cheaper than the other option

the gearbox above gives you 35 oz thrust @ 14.3 amps draw using a 11X5.5 prop.

I want somthing sporty and fast But I also want somthing that will give me longer duration.

Currently my other planes fly with a Eflite 450 on a 10X8 or a 10X7 flys fine. but wouldn't mind a bit more speed.

What should I do? I want speed, and duration. I need to order a motor soon.
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Old May 08, 2008, 12:41 AM
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kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
Quote:
Originally Posted by sinkinpat
http://epyaya.com/product_info.php?c...oducts_id=2072

this gearbox produces 25.7 Oz thrust @ 8.1 amps. according to their table you need 50% thrust to fly. for a sport plane you need 75% to 100% of the overall WT to fly sport. This is all with an 11X7 prop. Not to mention 20 bucks cheaper than the other option

the gearbox above gives you 35 oz thrust @ 14.3 amps draw using a 11X5.5 prop.

I want somthing sporty and fast But I also want somthing that will give me longer duration.

Currently my other planes fly with a Eflite 450 on a 10X8 or a 10X7 flys fine. but wouldn't mind a bit more speed.

What should I do? I want speed, and duration. I need to order a motor soon.
While thrust is important it is my belief that pitch speed is more important for fixed wing models. Pitch speed is dependant on the pitch of the propeller and the RPM that it is spinning at. I have flown models with a thrust to weight ratio of 0.25:1, i.e. a thrust one quarter of the weight. but these models had a pitch speed of at least 2.5 times the stall speed

To find the pitch speed you will need a published Propeller RPM figure as well as a Thrust and Amp Draw figures. Unfortunately the web site does not give this. By consulting MotoCalc I have come up with predictions that indicates you will need to draw around 20 amps on 3 cells to get speeds of around 50 MPH

My own EPO GWS-40 runs on a GWS 3008T outrunner and draws 19 amps for a top speed of around 50 MPH when a GWS 10 x 6 x 3 blade propeller is used.

Ken
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Old May 10, 2008, 04:04 AM
Registered User
Point Cook, Melbourne, Australia
Joined Aug 2007
104 Posts
Hi,

Maidened my GWS-40 today but it was not a pleasant experience. The plane had a Turnigy 35-30A 1700 kV outrunner spinning an APC 8x4E prop. There was just not enough power and throttle authority. Had to run at almost full throttle just to be straight and level. The plane was wallowing all over the place. Was pulling 26A on this prop. Changed to an APC 8x6E prop and there was better pull but I still had to keep the throttle at about 75% to be straight and level. Was pulling +40A on this prop at full throttle (way to much). I believe that I will need a motor which can spin a larger prop and provide more torque. Was thinking of trying out either one of these motors;

1. Turnigy 35-30A 1100 kV http://www.hobbycity.com/hobbycity/s...idProduct=3883

2. Turnigy 35-36C 1100 kV http://www.hobbycity.com/hobbycity/s...idProduct=3886

Anyone here using these motors on their P-40s ? Please do share your experience. Any other suitable motor recommendation would also be welcomed. Thanks
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Old May 10, 2008, 07:27 AM
nsg
Registered User
Yardley, PA
Joined Sep 2006
4,154 Posts
Either motor will work power-wise. With 35-36, you'd have problems achieving proper CoG. Unlike any other GWS model I have, GWS-40 is nose-heavy.
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Old May 10, 2008, 07:53 AM
WAA-08 THANK FRANK!
JimNM's Avatar
Las Cruces, New Mexico, United States
Joined Jun 2002
7,176 Posts
8 Inches is a bit small - I used 10x5E APC 10x7E APC or a 9x7.5HD GWS prop on the Scorpion 2215-18 motor. Plenty of go with 220 watts. I do fly at 4000 feet above sea level - you may have to adjust for more dense air.

200 watts is way more than the plane needs - I bet it would fly on 150 watts just as well.
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Old May 10, 2008, 11:17 AM
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glaros's Avatar
Greece
Joined Apr 2004
194 Posts
I have the Turnigy TR 35-30B 1400kv in mine spinning a APC 10x4.7 SF and it could fly level at less than half throttle.

Very happy with this combo.


Motor here
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Old May 11, 2008, 05:01 AM
Registered User
Point Cook, Melbourne, Australia
Joined Aug 2007
104 Posts
Thanks guys. Here are some pics of my P-40.

glaros,
How many amps are you pulling on the TR 35-30 1400kV with the APC 10x4.7SF prop? It looks kind of big for a 1400 kV motor.
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Old May 11, 2008, 12:44 PM
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glaros's Avatar
Greece
Joined Apr 2004
194 Posts
Quote:
Originally Posted by trotsky71
Thanks guys. Here are some pics of my P-40.

glaros,
How many amps are you pulling on the TR 35-30 1400kV with the APC 10x4.7SF prop? It looks kind of big for a 1400 kV motor.

Actually I have an APC 9x4.7 SF

Have to check the amp draw since I don't remember the numbers. I think I was getting 200W at WOT. I will check later and report.
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Old May 11, 2008, 01:52 PM
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kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
Are you guys aware that the APC Slowfly propellers have a "Recommended RPM Limit". The RPM Limits are detailed in this APC Safety Limits web page.

Doing the maths gives the following results:-

For 10 inch APC Slowfly propellers 65,000/10 = 6,500 Recommended Max RPM
For 9 inch APC Slowfly propellers 65,000/9 = 7,223 Recommended Max RPM

The motors mentioned, Turnigy TR 35-30B 1400kv, the Turnigy 35-30A 1100 kV and the Turnigy 35-36C 1100 kV will spin the the 9 and 10 inch Slowfly propellers to RPM beyond these limits.

If APC Thin Electric Props are used the Recommended RPM Limits are:-

10 inch Thin Electric Props 19,000 RPM.
9 inch Thin Electric Props 21,111 RPM.

Ken
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