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Old May 08, 2009, 01:46 PM
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skunkworks2006,

If you battery pack is not stock and you run a motor heat sink, then you can use a little more prop.

I suggest you read this thread...it is not very long:

http://www.rcgroups.com/forums/showthread.php?t=880705


A buddy was going to thoroughly test the stock motor last night, but he didn't have a 3mm prop adapter........Damn....last minute surprise.

If he can borrow that motor again (or keep this one longer), he will post numbers on the above linked thread...it'll have RPMs too. I told him to test up to 37A on ground. At above low 30A draw people better know what they are doing and some throttle control may be required besides heat sink.

KV of stock motor was measured at near 2200KV ...I always knew it was about 2150 KV.

1880 KV value is not real......
I know of one example: on a totally different motor the KV was off by about 500KV.

Im looking for feedback on APC Pylon 6.5X5.0 prop from him and for him to increase the pitch till he gets to 37A. He will start his testing with 6X4 then go up.


Gryphon
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Old May 08, 2009, 02:17 PM
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USA, NJ, Mt Laurel
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I run 6x5 on 4s 5000 stock motor.. but it had mods
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Old May 13, 2009, 10:11 AM
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Michigan
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What servos are you guys running in the hot strykers? I have a bunch of the HXT 900's but I don't know if I trust them. HS-81's? Do I need MG's? I don't care to have the best or fastest, but I sure don't want an airborne failure either.
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Old May 13, 2009, 02:20 PM
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skunkworks2006,

For piece of mind on a 120MPH strykers even after it hits the ground a few times would be Hitec 81MG or now days hitec 82MG with 10% more torque, 10% less speed....still GOOD speed on servo....both even faster and stronger on 6V.

For 130+MPH Strykers go with Hitec 85 MG.


Gryphon
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Old May 13, 2009, 04:22 PM
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IMO Full size digi or go home. Peace of mind is worth more to me then an ounce of weight

DS-821 FTW
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Old May 13, 2009, 06:21 PM
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Thanks.
I put HS-82 MG's in it. At least now I don't need to worry.
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Old May 13, 2009, 10:50 PM
If it floats....sail it!
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Elk Grove, CA
Joined Sep 2002
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Quote:
Originally Posted by GryphonRCU
skunkworks2006,
For 130+MPH Strykers go with Hitec 85 MG. Gryphon
Or if the 85 MG is too thick, a HS-5125MG thin wing digital...but have a thick wallet before you go shopping since they are 2X the price of the 85MG's

Even though the speed and torque are almost exactly the same between the two, to me the digitals just have a crisper, more responsive feel. Couple them with either a Futaba FASST or Xtreme Power Systems XtremeLink 2.4 GHz system with higher resolution on the servo signal (15 bit resolution for the FASST or 16 bit for the XPS versus 8 or 10 bits for the Spektrum) and you get much finer servo positioning and better control. At 100+ mph you need all the control you can get.

FC
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Old May 14, 2009, 02:02 PM
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Flew my stryker last night for a brief moment between rain drops.
set-up:
stock (unpainted) body, fins, ailerons, hatch, etc...
stock motor and motor mount
APC 6x4 (for now)
Futaba 4-channel single conversion RX
Super Simple 40amp ESC
HS-82 MG's
Zippy 2200 25C 3-cells

I glued in a carbon strip on edge across the body through the motor mount area, and used some strapping tape over it and the servo's and wires.

I had a short time with it, but long enough to see that I'm going to have a blast with this one. I'll most likely prop up to a 6x5 at some point and may try a 4-cell. But it's pretty fast and has unlimited vertical now. Yet, it stills slows down nicely for easy landings. I can see why this thing has been so popular. Up until now, I was flying a home-built "B-Model" with lipos on the stock brushed motor. It was fun and pretty quick for the park, but nothing like this.
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Old May 19, 2009, 02:24 PM
Philippians 4:13
Seward, NE
Joined Nov 2006
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Hey guys,
I have had my StrykerC for a couple years now and have had no probs at all. Love this plane. I would like to know if there is a Hobby City motor out there that will push this plane a little faster though. Anyone out there found one?
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Old May 19, 2009, 02:27 PM
Philippians 4:13
Seward, NE
Joined Nov 2006
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Quote:
Originally Posted by GryphonRCU
F-27C model is brushless and does 65MPH stock, and with 6X5.5 APC E prop that will become 72 MPH.
Nice. does this cause any problems with the stock esc or motor?
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Old May 26, 2009, 11:47 PM
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Michigan
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I've managed to break/crack the motor mount wear the motor screws in place. I got it CA'd back in plqce and put a piece of 3M strapping tape across the top.
Has anyone modified to make it stronger?
I've never had a bad landing on this one (yet) so I don't know why it has happened
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Old May 27, 2009, 03:28 AM
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ty_horn,

The motor is not maxed out with stock setup.

First step is to go to APC E 6X5.5, then the stock 25A ESC and battery will be the bottle necks not the motor.

Read the pages on the following link.
http://www.rcgroups.com/forums/showthread.php?t=880705

With better ESC, and 3S battery you can go to APC Pylon 6.5" diameter by 5.0 pitch or 5.5" pitch. Take amp measurements and report back.

Install full size heat sink and use full throttle sparingly in the summer.

Have fun,

Gryphon
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Old May 27, 2009, 10:08 PM
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Any ideas on reinforcing the motor mount?
Anyone? ....Beuhler?....
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Old May 28, 2009, 02:03 PM
Aerial Images of Texas
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The Texas Gulf Coast where hurricanes come to play
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Read back a few pages and you'll find more than one option for reinforcing the motor mount and or constructing a new mount system altogether.
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Old May 28, 2009, 02:54 PM
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Michigan
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A couple of pics

Here are a few pictures of my Stryker. I may just run a new stock motor mount, but will likely reinforce it with epoxy and an alum. disk.
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