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Old Sep 20, 2011, 07:28 PM
Blade mSR freak
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Irish Hills - SE Michigan
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Broke the shaft on my blue motor tonight. Pulled up too early on takeoff with a half-discharged pack, tip stalled, flipped and tumbled.

What can I use as a replacement motor? I don't care if I need to switch to a more standard-style shaft and prop, as long as I can still get it balanced and clear the cowling.

Can I swap out the bearings and shaft to something more typical?

thanks...
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Old Sep 20, 2011, 09:47 PM
dbc
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United States, FL, Brooksville
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Chad:

PM'ed you with some suggestions.

Let us know what you come up with.
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Old Sep 21, 2011, 08:46 AM
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United States, AZ, Mesa
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Quote:
Originally Posted by hydro_pyro View Post
Broke the shaft on my blue motor tonight. Pulled up too early on takeoff with a half-discharged pack, tip stalled, flipped and tumbled.

What can I use as a replacement motor? I don't care if I need to switch to a more standard-style shaft and prop, as long as I can still get it balanced and clear the cowling.

Can I swap out the bearings and shaft to something more typical?

thanks...
Eflite power10 looks like a decent fit, I plan to upgrade mine with one, soon as I find the time.
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Old Sep 21, 2011, 02:57 PM
Blade mSR freak
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Irish Hills - SE Michigan
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Thanks for the PM, dbc.

The shaft could not be removed from my flux ring. Even with the allen set screw loose, it will not budge. Heat cannot be used, as it may weaken the magnets. That fact also makes silver brazing difficult, not to mention the heatsinking effect.

The Power 10 is almost double the weight of the Dynam blue motor, and costs half as much as the entire plane. Not sure is the stock 30A ESC would work with it, as I have very little experience with matching up these combos.
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Old Sep 21, 2011, 03:10 PM
dbc
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The power 10 would not be an appropriate choice - far too large and heavy.

Hydro:

The motor shaft is always a tight press fit onto the bell. After loosing the grub screw, use a large vice and a shim for the bell ( a large socket works well). You can almost always press the shaft out like this without damaging the bell. Alternatively, others hammer the shaft out; but that's not recommended.

Problem is going to be finding a suitable replacement. I think the shaft dia is 3.17 mm and you'll find lots of generic replacements in this dia. You might have to settle for a slightly shorter, unthreaded shaft and use a prop adapter.

If you'd like to try the headsup motor I mentioned, I've still got the one I used and would sent it to you, if you want. As I recall, it's a "drop in" fit and does an adequate job of powering the plane.

I could also suggest other appropriate choices. There are lots of other 2830 1100kv motors that would work.
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Last edited by dbc; Sep 21, 2011 at 03:23 PM.
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Old Sep 21, 2011, 05:35 PM
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Quote:
Originally Posted by hydro_pyro View Post
Thanks for the PM, dbc.

The shaft could not be removed from my flux ring. Even with the allen set screw loose, it will not budge. Heat cannot be used, as it may weaken the magnets. That fact also makes silver brazing difficult, not to mention the heatsinking effect.

The Power 10 is almost double the weight of the Dynam blue motor, and costs half as much as the entire plane. Not sure is the stock 30A ESC would work with it, as I have very little experience with matching up these combos.
Sounds like you have it all figured out. Happy flying. . . .

Remember if you want answers to your questions on RC groups, the best way to get one is, to post something incorrect and people will come out of the woodwork to correct you. Peace
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Old Sep 21, 2011, 05:48 PM
dbc
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Nitro has put the ARF version back on sale for $79. Maybe just buy a backup and use it for parts.
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Old Sep 21, 2011, 06:36 PM
Blade mSR freak
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Irish Hills - SE Michigan
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I got that email too.

Says 950kv, hope it's actually the 1100kv blue, not the red.

Might get one anyway for the motor and a spare airframe.
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Old Sep 21, 2011, 08:03 PM
Blade mSR freak
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Irish Hills - SE Michigan
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Oddly, their sister site shows the blue 1100kv motor in stock...

http://store.yahoo.com/yhst-62196343...15-kv1100.html

We'll find out soon if they actually have it and ship it...
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Old Sep 21, 2011, 09:00 PM
dbc
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I got a backup last time they were on sale for $79 a few weeks ago. It has the blue motor.
Interesting they show in stock one place and out another - you never know for sure when you're dealing with Nitroplanes!
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Old Sep 22, 2011, 09:37 AM
dbc
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Hydro:

Check out the last post in this thread from Okie 1. The motors used in the Grand Cruiser are the same as the Sky Trainer. Apparently, he's found a suitable replacement shaft for the blue motor:

http://www.rcgroups.com/forums/showt...314947&page=70
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Old Sep 22, 2011, 07:00 PM
Blade mSR freak
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Irish Hills - SE Michigan
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Indeed... thans again for the link. Here's the shaft kit, $2.99...

http://www.graysonhobby.com/catalog/...bly-p-247.html


They also list several bearings for this size shaft-- My front bearing is VERY noisy. http://www.graysonhobby.com/catalog/...8a01395472f1ad
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Old Sep 23, 2011, 03:40 PM
Team Wack-a-Mole
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Quote:
Originally Posted by dbc View Post
Nitro has put the ARF version back on sale for $79. Maybe just buy a backup and use it for parts.
yea, all those sales end 9/26 (or when they go out of stock)
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Old Sep 29, 2011, 08:44 PM
Blade mSR freak
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Irish Hills - SE Michigan
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My new Dynam (BLUE) motor arrived for the Cessna. Installed today. All better.
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Old Sep 30, 2011, 07:10 PM
dbc
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Good to hear your Cessna is back in action, Chad.

The 1100kv Dynam motor just works best with this plane. It sounds raspy but sure powers the plane nicely. I've tried several other similar sized motors but nothing works as well.

I'm still flying mine almost daily and now have 194 flights on it.
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