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Old Feb 26, 2008, 12:55 AM
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gotboostedvr6's Avatar
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i just threw mine on and added a air splitter
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Old Feb 26, 2008, 06:04 PM
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Somewhere in central Oklahoma
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I have a ESKY 370 3900 kv brushless and speed controller from a crashed helicopter that I want to put on one of my Strykers. I have one that has a brushed 370 ducted fan that this motor will bolt right into. Then I have a old A version that I can adapt it to fit with a C model motor mount.
Will this motor be alright on a Stryker and what prop would be good for its use?
Or will this motor be too much for a Stryker?
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Old Feb 26, 2008, 06:13 PM
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gotboostedvr6's Avatar
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3900 kv is WAY to high a rpm for this plane... unless your using EDF the stryker needs a 6" prop with less then 20 amps and a 5" prop with over 25 amps and at least 20 oz thrust
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Old Feb 26, 2008, 08:12 PM
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lol, here comes the heli guys.

So where did you get that mount vr6?
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Old Feb 26, 2008, 08:23 PM
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its a stock C mount with some wood on the end
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Old Feb 26, 2008, 08:39 PM
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Somewhere in central Oklahoma
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Quote:
Originally Posted by GFBurke
lol, here comes the heli guys.

So where did you get that mount vr6?
Yes, I tried helicopters for a short while. Ended up not liking the constant repairs. The Strykers I have are not new. One is an original A version that I am flying with the stock motor and a 8-cell pack. The other has a 370 brushed ducted fan and is quite lame. I just figured I could put that 370 brushless in the fan, it will fit, and maybe wake up the performance a wee bit.

I LIKE MY STRYKERS!
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Old Feb 27, 2008, 10:32 AM
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Raleigh, NC
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Quote:
Originally Posted by cbxer55
I have a ESKY 370 3900 kv brushless and speed controller from a crashed helicopter that I want to put on one of my Strykers. I have one that has a brushed 370 ducted fan that this motor will bolt right into. Then I have a old A version that I can adapt it to fit with a C model motor mount.
Will this motor be alright on a Stryker and what prop would be good for its use?
Or will this motor be too much for a Stryker?
Actually you can make that motor work if you use an APC 5x3 prop on it. Check the amp limit on your motor because with the the 5x3 at 3900kv it's probably going to pull around 28-29 amps at full throttle. If your motor supports it, you'll have over 25 oz of thrust and probably 80 to 85 mph speed maybe faster.

While some disagree with me , I've been using a 3500 kv motor with an APC 5x3 prop and have been very happy with the speed and thrust - mine is giving me almost 25 oz of thrust and about 75 mph in level flight while drawing up to 25 amps at full throttle. Does verticals very nicely. Gets a little wild if you do a full throttle dive and then pull into some tight loops and rolls, or shoot it skyward while rolling, then hammerhead (sorta - as best as an elevon based plane can do)...
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Old Feb 27, 2008, 10:46 AM
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On second thought...

I tried to look up the ESKY 370 brushless motor and didn't find much. I found a few other 370 motors but they looked small and only could handle around 10 amps. With a 3900 KV you'd need a 3x3 prop to keep the amps at around 10 which would not be enough thrust for the Styrker... Even with the a lower KV, 10 amp motor is barely adequate for the Stryker... (basically it would be the same as your brushed Stryker A).

Now if your 370 has a much higher amp limit, then what I suggested above could work...

Interestingly I built a 34" blue foamy wing and moved my Park 400 4200 KV with a 4.25x3 prop on that plane. That plane weighs only 15 oz and it moves! On old worn out lipo's I'm getting around 85 with it and excellent vertical. Can't wait to try some new lipos on it...
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Old Feb 27, 2008, 04:35 PM
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What about in a ducted fan. This motor is a bolt in replacement for the brushed motor in my fan powered Stryker. Has not been flown yet due to incessant bad weather or wind. The fan on 8 cells will easily slide the plane across my lawn with enough power to appear to want to get air borne. The fans instructions say to remove 3 of the 6 blades when going brushless. Think the smaller impeller in the fan will work well with that motor?
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Old Feb 27, 2008, 04:49 PM
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Quote:
Originally Posted by cjbucher
On second thought...

I tried to look up the ESKY 370 brushless motor and didn't find much.
That's because they don't exist. Eflite park 370 motor yes.
Esky 3100 kv brushless = does exist.
ESKY 3900 kv brushless = does exist.



Just get a cheap outrunner man. Like $20-$50.
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Old Feb 27, 2008, 07:57 PM
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STOCK C DATA:

Nobody seems to have ever put up any Stock stryker C data, so I thought I would give it a shot and got some data that surprised me a little (all data from Eagle Tree):

No load:
8.08v/0.85amp/18248rpm
9.28v/0.98amp/20833rpm
Data with APC E 6x4 (with stock C prop it was 1-2 amps higher for those who want to know, but I don't plan on using it any more):
10.34v/20.14a/18518rpm
10.21v/19.64a/18315rpm
10.27v/19.77a/18382rpm

What surprised me is that when I entered all of this data into drivecalc it calculates the kv of the motor to be 2258, which is significantly higher then the specs say (1880kv). Anyone have an opinion on this? Do I have a motor that is hotter than the norm, or are they just all underrated for KV?

As I said above, these tests were with stock c motor and stock eflite esc. Only thing not stock is APC 6x4 prop and batteries used were Loong Max 2250 15C. No load tests were done with a friends power supply, but still recorded with the eagle tree.
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Old Feb 27, 2008, 09:32 PM
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Raleigh, NC
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Quote:
Originally Posted by GFBurke
That's because they don't exist. Eflite park 370 motor yes.
Esky 3100 kv brushless = does exist.
ESKY 3900 kv brushless = does exist.



Just get a cheap outrunner man. Like $20-$50.

Didn't mean to upset you, but I was searching based on what he posted

"Originally Posted by cbxer55
I have a ESKY 370 3900 kv brushless "


I looked for ESKY 370 and didn't find anything.

I found this on the ESKY 3900: http://www.esky-heli.com/brushless-m...1-pr-2654.html

Max amps is 17 so no go on the the 5x3 prop.

cbxer55, I'd say give the EDF a try. Worth a shot. Not sure what kind of performance you'll get though. But hey it's a hobby - might be fun to try out and report back how it went.
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Old Feb 27, 2008, 09:49 PM
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upset me? o no man.. I was just saying that thats not a real thing.. that's why you couldn't find much in google.


I think styker EDFs look tight man
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Old Feb 27, 2008, 10:18 PM
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Quote:
Originally Posted by GFBurke
upset me? o no man.. I was just saying that thats not a real thing.. that's why you couldn't find much in google.


I think styker EDFs look tight man

Waste of time and $$$ IMO. The Stryker does great with a pusher, which is the way it was designed to be. Unlike the Lynx which performs much better with a pusher than the EDF it was designed for. I don't think the Stryker is going to perform better on EDF, it just has the cool factor of EDF. I would suggest a plane designed for it.

Diggs
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Old Feb 27, 2008, 10:25 PM
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gotboostedvr6's Avatar
USA, NJ, Mt Laurel
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Less then 30amps draw in a EDF on a Stryker will still be slower then stock and still have less thrust.


I would find a ~2000 KV pusher setup and have something fun and not insanely amp hungry
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