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Old Sep 23, 2009, 05:58 PM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
6,853 Posts
Stock Motor Mount Stryker

The stock motor mount is not holding up for me at all. Every time I strap a motor on to it the screw mounts pop off after 8-10 flights. Is anyody else having propblems with this???

I'm looking for an easy more efficient mount to put on a stryker. Any ideas?
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Old Sep 23, 2009, 06:29 PM
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Stryker Flyer's Avatar
Fort Worth, Texas
Joined Apr 2009
129 Posts
I am using blue loctite and a small flat washer along with the stock screws and lockwashers. Make sure yours came with lockwashers. Also make sure the prop is balanced the vibration can break things.
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Old Sep 23, 2009, 08:33 PM
Why the dirt on the wings?
moparmyway's Avatar
New York
Joined Jan 2009
5,000 Posts
Quote:
Originally Posted by johnnyrocco123
The stock motor mount is not holding up for me at all. Every time I strap a motor on to it the screw mounts pop off after 8-10 flights. Is anyody else having propblems with this???

I'm looking for an easy more efficient mount to put on a stryker. Any ideas?
Stryker Flier is correct on the Loctite.
I do NOT run any lockwashers though, as they tend to crack the tabs.
Key is to tighten with only 2 fingers, then allow the Loctite to set-up before flying. This keeps those pesky tabs from breaking.

There is a motor mount design being worked out now, just about ready for release, but still in R&D phase. Stand by a few more weeks and lets see what we can come up with, till then, even I must stick with those pesky stock mounts !!!
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Old Sep 23, 2009, 08:34 PM
Why the dirt on the wings?
moparmyway's Avatar
New York
Joined Jan 2009
5,000 Posts
Quote:
Originally Posted by ender707
I know this motor has been mentioned before on this forum, do you guys have any input on it?
That motor is an AWSOME 6s motor for speed, and a great motor on 5s for insane 7 inch props !!!!

If you can run the cells needed, then I say GO FOR IT !!!!!!!!!!!!
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Old Sep 23, 2009, 08:49 PM
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United States, CA, San Luis Obispo
Joined Jul 2009
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geez, 5 and 6s...is that what i should run with it, or stick to 3s and 4s?
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Old Sep 24, 2009, 12:50 AM
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GryphonRCU's Avatar
United States, CA, SF
Joined Mar 2008
3,875 Posts
Twister773,

Compare KV and you will/should have your answer.


With large 3S, you should fly at same speeds as that setup on 5S-6S.

Large 4S is max voltage for you in a Stryker, {large 5S for Funjet with lot of throttle control}. Big heat sink for high AMP setups.


Due to prop size_power_thrust_drag of airframes.


Gryphon
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Old Sep 24, 2009, 12:52 AM
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United States, CA, San Luis Obispo
Joined Jul 2009
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Oh I misunderstood what they were talking about. Thanks I want to start building so bad lol
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Old Sep 25, 2009, 05:46 PM
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ender707's Avatar
Sacramento, CA
Joined May 2009
718 Posts
Medusa

I decided to pick up one of the Medusa 28-40-1700kv V2 partly on what was said here, and partly based on data from their website (and the cheap closeout price).

www.medusaproducts.com has a motor calculator that estimates pretty good results using a 4 cell lipo with an APC 6x5.5 prop: 27.25 amps, 43.75 ounces Thrust, 114.9 mph Pitch Speed. Do you guys think that reality will agree with this?

Currently I am getting excellent climbing and good speed with a Turnigy 2836-2350kv (Dr. Kiwi measured 2800kv) on 3 cells with a 6x5.5, producing ~36 ounces of thrust, ~95 mph pitch speed at ~40 amps, so this should be pretty good jump in performance.

Now when Fuses come back in stock I will begin assembling a stronger plane to handle more speed.
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Old Sep 25, 2009, 07:29 PM
warranty expired
NOTAR 600's Avatar
Central Ohio
Joined Nov 2007
1,666 Posts
ender707, Let us know how that medusa works. Looks like those are discontinued now but it sounds like a good one.
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Last edited by NOTAR 600; Sep 25, 2009 at 08:50 PM.
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Old Sep 25, 2009, 07:45 PM
I buy, I fly, I buy....
Wingwrecker's Avatar
United States, OH, Toledo
Joined Feb 2008
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Quote:
Originally Posted by ender707

Now when Fuses come back in stock I will begin assembling a stronger plane to handle more speed.
Graves RC has 14 in stock.
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Old Sep 25, 2009, 10:59 PM
Why the dirt on the wings?
moparmyway's Avatar
New York
Joined Jan 2009
5,000 Posts
Quote:
Originally Posted by ender707
motor calculator that estimates pretty good results using a 4 cell lipo with an APC 6x5.5 prop: 27.25 amps, 43.75 ounces Thrust, 114.9 mph Pitch Speed. Do you guys think that reality will agree with this?
I totally do NOT agree with their calculator, not one bit, not at all !!!

For any real performance, plan on running 5 or even 6 cells and you will need to get rid of some heat with a good heatsink.

Amps under 30 ?????

If you want to run 4 cells, step up to a 6.5 inch prop, or better yet a 7 inch prop will put a BIG smile on your kisser !!!!!!!!!
What size ESC is that Plush ? and what size are your batts ?
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Old Sep 25, 2009, 11:09 PM
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Prof100's Avatar
Canton, Michigan USA
Joined Jul 2007
16,650 Posts
moparmyway,

4S stocker question.

I have a new PNP Stryker I haven't even maidened (too much fun with EDFs). I added CF to fuselage along the span, reinforced the motor mount area. Elevons are stock.

I have several 2200 4S packs I use in the EDFs which would be used in the Stryker.

What do you suggestion for:

Prop
ESC amp capacity
Other reinforcements for the Stryker.

Bill
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Old Sep 25, 2009, 11:56 PM
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ender707's Avatar
Sacramento, CA
Joined May 2009
718 Posts
Quote:
Originally Posted by Wingwrecker
Graves RC has 14 in stock.
I mean my local shop, RC Country in Sacramento.

Mopar, Thanks for the info;

I have a bunch a 3 cells, so if 4 cell does not work out with that motor I could Make 6 cell batts no problem, I would just need a higher rated ESC, currently I have the Plush 40 on an EDF, but my Stryker has a Pentium 40 on it.

As far as props with 4 cells go, I have a "Watts Up" meter, and could go with a 7,6.5,or 6 inch prop depending on readings I get. I want test some 4 cell setups before I start messing with a 6 cell setup!

I feel that my setup now has a good combination of climbing/speed, I am going to try to get more climbing/speed than I have now, not all out speed.
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Old Sep 26, 2009, 03:21 AM
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United States, CA, SF
Joined Mar 2008
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ender707,

If when you move to 5S, do not run low amps.

If/when you move to 6S, start at 55A and then move up in small increments...while keeping an eye on motor temp. (don't run below 50A)

on 3S, 4S you have the option of running fewer amps.

4S with higher amps can give you a little above 100 MPH and good vertical (unlimited).

This motor is very similar to MEGA 16/25/3 1700KV (480 size).

On my brother's MEGA 480 (1700KV), we had APC Sport 7X7 and for extra climbing fun, we ran APC E 7X5.


Mopar knows what he is talking about....some folks loved APC Pylon 6.5X6.5 on the 1700 MEGA for longer run times.
Get yourself MPI 28mm heat sink.


Gryphon
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Old Sep 26, 2009, 06:24 AM
Why the dirt on the wings?
moparmyway's Avatar
New York
Joined Jan 2009
5,000 Posts
Quote:
Originally Posted by Prof100
moparmyway,

4S stocker question.

I have a new PNP Stryker I haven't even maidened (too much fun with EDFs). I added CF to fuselage along the span, reinforced the motor mount area. Elevons are stock.

I have several 2200 4S packs I use in the EDFs which would be used in the Stryker.

What do you suggestion for:

Prop
ESC amp capacity
Other reinforcements for the Stryker.

Bill
Hey Bill,
That stock motor will need some mods (like I posted on the other thread) before you run 4s. I have measured a few motor resistances from out of the box Strykers, it seems that they had 2 different motors (or I tested a few bad ones) with 2 different resistances, and possibly 2 different kv's..........??

Do you have any data logger capability ?
If so, please get me the no load kv with 3s batts so I can tell you the motors limit.

Also...........do you have a heatsink like Lightflight, MPI, Medusa has ??

ESC................Definately above a 30, possibly a 60 depending on future plans. If just running the stocker, then I humbly suggest a 40. (A 6x4 sport will draw about 37/38 amps on 4s if you have their newer version of the stock motor)

Mods to airframe...........CF works very well if you run 1 left to right (tip to tip) and 1 front to rear (center line starting as far forward as you can and allow CF to exit under motor mount trailing edge, trim after glue dries/cures)

1. Get rid of stock servos, stock rods, stock clevises and install HS65's (minimum), 2-56 rods and clevises.

2. Re-enforce elevons (a quick 3m X-Treme tape job works well, especially if you wrap 1/2 on top then wrap second 1/2 around end of elevon and under on bottom side)
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Last edited by moparmyway; Sep 26, 2009 at 06:32 AM.
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