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Old Feb 02, 2008, 08:15 PM
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Zip 08857
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Quote:
Originally Posted by cryhavoc38
I completely understand, but you can always get a hot motor, and just not enter into the upper regions of the throttle while you get comfortable with pusher prop jets. Then when you get comfortable, you can open it up!!!

I have that turnigy on the way, and one of these for the SU-47 I'm building

http://www.hobbycity.com/hobbycity/s...idProduct=4899




Also bought this one. The shaft was easy to reverse. Spins up nice and has good power with a 7x5e prop.
Price is very nice!



http://www.hobbycity.com/hobbycity/s...idProduct=5102
Those are nice prices...how's the quality and is the shipping expensive? I have been temped to order from them but never have. That's a Hong Kong company, no?
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Old Feb 02, 2008, 08:37 PM
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Canada's East Coast, "An Ocean Playground"
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That Tower Pro (200Watt) at $14. looks like a good one...another 28 grams of weight but it would probably take a lickin and keep on tickin....says the shafts are soft..wonder if prop strikes would affect it on landings..

Bill
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Old Feb 02, 2008, 09:47 PM
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Quote:
Originally Posted by cryhavoc38
depending on how heavy you built your jet, I'd say that motor is nominal on three cells with a 7x5e prop.

It will certainly fly it, but it won't be jet fast.

I'd go with this one

http://www.bphobbies.com/view.asp?id...7&pid=B2632603

You would just have to up your esc to a 30 or 35amp.

That motor, turning 2200kv, with either a 6x5.5 or a 7x5e prop would be great.

I'm running a little screamers super park jet on a 7x5e prop and it has tons of thrust and the speed is pretty good. My esc is an emax 30amp.

Have a look..

http://www.rcgroups.com/forums/showthread.php?t=808349

Looks like a high speed amp hungry motor to me.

It draws more current, weighs more yet has less thrust than other motors with lower KV. I'm sure it will make the F-14 FAST, but slow speed performance may suffer, as will run times.

Luke
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Old Feb 02, 2008, 10:05 PM
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Quote:
Originally Posted by Lukejt
Looks like a high speed amp hungry motor to me.

It draws more current, weighs more yet has less thrust than other motors with lower KV. I'm sure it will make the F-14 FAST, but slow speed performance may suffer, as will run times.

Luke
All opinions are welcomed. What about the one I originally asked about?

http://www.bphobbies.com/view.asp?id...7&pid=B1898552

After re-reading some of the earlier post it now seems my choice of this motor is underpowed, no?

I have a e-flite Park 400 920kv outrunner sitting around waiting for some action. What do you think about using that with a 7x5 prop for this build?
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Last edited by JookSing; Feb 02, 2008 at 10:12 PM.
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Old Feb 02, 2008, 10:13 PM
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Quote:
Originally Posted by JookSing
All opinions are welcomed. What about the one I originally asked about?

http://www.bphobbies.com/view.asp?id...7&pid=B1898552

After re-reading some of the earlier post it now seems this choice is underpowed, no?

We're in the same boat.....

IMHO (and I could be wrong) that motor may be a bit down on power, it's specs are very similar to the 2812 motor that I installed in my F-14.

I'd look for a motor with closer to 200 watts with a KV around 1500kv. Of course if you built your plane super light a smaller motor could/would work great.

The higher KV motors are good for one thing, SPEED. They're fun, but if you want balanced flight performance and decent run times I'd steer clear of any motor above 2000kv...unless you plan on using a gear box.

Luke
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Old Feb 03, 2008, 12:12 PM
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on my much heavier F-22 I used this motor HiModel A2409(A)-12T
http://www.rchotdeals.com/Products/r.../A2409A12.html

I got it at a local event where this guy was selling.
He's out of Portland.

My 20+ oz F-22 goes vertical with it.

My F-14 however is only 14 oz with 1300 lipos so it didnt need that much PUSH :-)
At 200 watts and 1500 KV the little F-14 should be capable of Wonderous things !
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Old Feb 03, 2008, 04:43 PM
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Haha,

I had much better success with the F-14 today. The only prop I've got that will push it with the 2812 is my cut down 8x6DD (I don't own an APC 7x6). What I thought was torque roll was in fact the way the radio trims when setup in Heli mode with auto wing retract. Once I figured out I had to trim both servos (first elevator, then aileron) I was all set. If somebody knows how to correct this, I'm all ears. It makes trimming the plane a bear.

I still want some more juice. Another 50 watts or so and I'll be all set.

On another note, I was showing off my Saab J-35 to my father today when I clipped the top of a tree at a high rate of speed. The plane wound up nose down in the ground with the top 12" of the tree all caught up in the wings. That's one tough and fast foamie.

Luke
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Old Feb 03, 2008, 07:12 PM
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Ipoh, Perak Malaysia
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If you don't mean "subtrim", then if you are using Futaba 9C, there is a software switch label "Link" where you set up the Elevon mix. If you set this to ON then when you trim one side, the other will move accordingly. I don't know about other radios.

chewy
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Old Feb 03, 2008, 07:47 PM
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United States, WA, Woodinville
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Quote:
Originally Posted by birdofplay
on my much heavier F-22 I used this motor HiModel A2409(A)-12T
http://www.rchotdeals.com/Products/r.../A2409A12.html

I got it at a local event where this guy was selling.
He's out of Portland.

My 20+ oz F-22 goes vertical with it.

My F-14 however is only 14 oz with 1300 lipos so it didnt need that much PUSH :-)
At 200 watts and 1500 KV the little F-14 should be capable of Wonderous things !
Your himodel 2409-12 is the same one I listed from hobbycity. Its a towerpro motor. In fact the IE tab at rchotdeals lists it as a towerpro.

RChotdeals is selling that one for $24.99 plus $5 shipping and you can get it at Hobbycity for $15 or less depending on your customer level (the discount you get for having multiple orders) .I see it at $13.81 plus $5.84 shipping.

Cant wait to try it out on your SU-47 Bob.
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Old Feb 03, 2008, 08:03 PM
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OH GeeZZZ ! ! !

Hang On tight ! ! !

IF your SU-47 is as light or lighter than mine,
AND That is several oz lighter than my F-22 then YOU GOT ZOOM !

Thats why I havnt been back to RCHotdeals
However as I recall he did throw in TWO prop adapters Large and Small
and the spider mount.
I 1st ran into that guy at the electric meet at Washugal.

I mounted the back side and pushed the SHAFT thru !
It wasnt interested in moving but a little gentle persuasion worked ;-)

It's heavier than my Komodo ( on my SU-47 ) so you'r gonna hafta
use BIG batteries or move them way forward !
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Old Feb 03, 2008, 08:03 PM
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Quote:
Originally Posted by birdofplay
on my much heavier F-22 I used this motor HiModel A2409(A)-12T
http://www.rchotdeals.com/Products/r.../A2409A12.html
I have the same one from HC too. same specs and looks the same too.
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Old Feb 03, 2008, 08:07 PM
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The HC one actually lools BETTER in their pix.
Rchotdeaals has a terrible pix IMHO.

MY Real motor looks ok and GOES !!!!

And since I'm a winder I have NOT been NICE to this motor.

But it's still ticking ! ! ! Big surprise.

I'm happy with it.

Edit later:

I also have discovered these folks ...
www.lightflightrc.com

The Suppo motors are very cost effective if they are anywhere as good
as they look.
I've only purchased Rx's so far but intend to buy motors soon.
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Last edited by birdofplay; Feb 03, 2008 at 11:35 PM.
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Old Feb 04, 2008, 10:35 AM
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Maryland
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Quote:
Originally Posted by chewytm
If you don't mean "subtrim", then if you are using Futaba 9C, there is a software switch label "Link" where you set up the Elevon mix. If you set this to ON then when you trim one side, the other will move accordingly. I don't know about other radios.

chewy

I've got a JR 6102. When setup in Heli mode as shown on page 11 of this thread, the trim only moves one servo at a time. In other words, to add up trim on the elevons, first click down on the elevator chanel, and then left on the aileron channel to balance things out. I'm starting to get used to it now. If I only trim the elevator channel, the plane will pull either left or right until I match the clicks on the aileron channel.

Luke
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Old Feb 04, 2008, 10:38 AM
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Luke,

There MUST be a software switch somewhere that you are missing... JR can't be that much worse than Futaba. Try manuals or try asking in the JR forums.

chewy
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Old Feb 04, 2008, 10:40 AM
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I just got my burnt pizza delivered today. Will start on it soon, but may not have much time as Chinese New Year starts on Thursday, and also we have to get prepared for the next General Election which is going to be soon.

chewy
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