By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

which motor..........

All Topics | Latest Posts

Search for:  in Thread Title in  
Ade Eades (Eadsie)08/08/2013 18:03:52
avatar
108 forum posts
17 photos

I have posted a thread already......

http://www.modelflying.co.uk/forums/postings.asp?th=86466

I have been told (quite rightly) my E-Flite 420 heli motor is no good for plane applications as its 3800kv and would spin the prop far to fast, i need to do a lot of homework by the look of things and learn.....Anyway, i was wondering about turning down the throttle settings on my DX6i so 'Full throttle' would only be about 60% throttle....would that be ok? if my motor spins the prop too fast does it not work then? i thought it would just make the model faster....as you can see, i'm totally new to plane building/setup etc....might just get a different motor....but funds are limited just now....so its either model or motor by the looks of things.

Regards Ade

J Myers III08/08/2013 18:10:43
avatar
181 forum posts
6 photos

Wouldn't that kv be alright for an EDF which needs to spin fast?

Ade Eades (Eadsie)08/08/2013 18:12:48
avatar
108 forum posts
17 photos
Posted by J Myers III on 08/08/2013 18:10:43:

Wouldn't that kv be alright for an EDF which needs to spin fast?

Thanks for the quick reply, and forgive my stupidness....whats 'EDF' mean?

J Myers III08/08/2013 18:35:03
avatar
181 forum posts
6 photos
Posted by ADRIAN EADES on 08/08/2013 18:12:48:
Posted by J Myers III on 08/08/2013 18:10:43:

Wouldn't that kv be alright for an EDF which needs to spin fast?

Thanks for the quick reply, and forgive my stupidness....whats 'EDF' mean?

Electric Ducted Fan. Think electric jets smiley

fly boy308/08/2013 19:56:08
avatar
3746 forum posts
22 photos

Hi Adrian, welcome to the Forum. You are not stupid by any means. By asking questions and being answered by very knowlegable folk on here, is a very good way of learning quickly. Wish this forum was around when I started, but there were no PCs around then either Ha Ha, Ask away. Cheers

Ade Eades (Eadsie)08/08/2013 22:02:25
avatar
108 forum posts
17 photos

gotcha, *writes it down* thanks chaps.....more food for thought, thank you.

Ade Eades (Eadsie)08/08/2013 22:21:26
avatar
108 forum posts
17 photos

There is nothing like a Baptism-of-fire..........i have just bought a T-45 rc 64mm EDF RC JET.......that should keep me busy lol..........i can use all my bits and bobs i have lying around

Regards ade.

J Myers III09/08/2013 14:35:04
avatar
181 forum posts
6 photos
Posted by ADRIAN EADES on 08/08/2013 22:21:26:

There is nothing like a Baptism-of-fire..........i have just bought a T-45 rc 64mm EDF RC JET.......that should keep me busy lol..........i can use all my bits and bobs i have lying around

Regards ade.

I also have a T-45 waiting to be put together, it yours the Hobbyking/Lanyu T-45?

Ade Eades (Eadsie)09/08/2013 17:00:25
avatar
108 forum posts
17 photos
Posted by J Myers III on 09/08/2013 14:35:04:
Posted by ADRIAN EADES on 08/08/2013 22:21:26:

There is nothing like a Baptism-of-fire..........i have just bought a T-45 rc 64mm EDF RC JET.......that should keep me busy lol..........i can use all my bits and bobs i have lying around

Regards ade.

I also have a T-45 waiting to be put together, it yours the Hobbyking/Lanyu T-45?

It is this one........

http://www.ebay.co.uk/itm/t-45-rc-64mm-edf-Rc-jet-kit-New-in-uk-/200951136219?pt=UK_ToysGames_RadioControlled_JN&hash=item2ec99effdb

Ade Eades (Eadsie)09/08/2013 17:46:49
avatar
108 forum posts
17 photos
Posted by ADRIAN EADES on 09/08/2013 17:00:25:
Posted by J Myers III on 09/08/2013 14:35:04:
Posted by ADRIAN EADES on 08/08/2013 22:21:26:

I also have a T-45 waiting to be put together, it yours the Hobbyking/Lanyu T-45?

Do you have a link to your model?

J Myers III10/08/2013 21:42:50
avatar
181 forum posts
6 photos
Posted by ADRIAN EADES on 09/08/2013 17:46:49:
Posted by ADRIAN EADES on 09/08/2013 17:00:25:
Posted by J Myers III on 09/08/2013 14:35:04:
Posted by ADRIAN EADES on 08/08/2013 22:21:26:

I also have a T-45 waiting to be put together, it yours the Hobbyking/Lanyu T-45?

Do you have a link to your model?

That's the one I have

Ade Eades (Eadsie)10/08/2013 22:38:47
avatar
108 forum posts
17 photos

Cool.....mine is in the post...........will post my progress.......or failure lol

Ade Eades (Eadsie)15/08/2013 17:19:31
avatar
108 forum posts
17 photos

I have read lot's about in / out-runner motors.......am i right in saying that inrunner motors DON'T have as much Torque as their out equivalent?

Which leads me onto my next question.....is a 'Outrunner' Motor better for EDF's? or does it not really matter?

I'm learning smiley

PatMc15/08/2013 17:58:30
avatar
4470 forum posts
548 photos

Power = torque x rpm

Most in-runners are higher KV than most out-runners therefore for the same power most in-runners will have lower torque.

Never tried EDF but as I understand it since the fan size is limited it needs to operate at higher rpm than a conventional prop would for the same power output. In which case a high KV motor is needed - i.e. an in-runner is more likely to be suitable.
Also because a out-runners usually have more magnets than in-runners the rpm that the ESC can handle could become an issue.

Ade Eades (Eadsie)15/08/2013 19:15:03
avatar
108 forum posts
17 photos

interesting, thank you.

Steve Hargreaves - Moderator02/09/2013 21:45:11
avatar
Moderator
6765 forum posts
197 photos

The main reason Outrunners have more torque than Inrunners is because the point at which the torque is generated (ie the gap between the magnet & the stator coil) is further away from the shaft on an outrunner than an inrunner....torque is a product of force x distance...hence lbs.ft or kg.cm.....increase the distance & for a given force the torque will be higher.

For a practical demonstration try & undo your cars wheelnuts with a 6" spanner.....hard isn't it? You have to apply a lot of force because of the short lever...now try again with a 2' spanner....much easier isn't it? The nut was just as tight but the longer spanner allowed you to apply more torque for the same force....

Ade Eades (Eadsie)03/09/2013 10:36:53
avatar
108 forum posts
17 photos
Right, tried that, Crikey Charlie! That was tough, but i think it was easier to get the wheel nut off with the longer spanner because i loosened it a bit with the short spanner first. . . . Hey, just me kidding. That's a great way of explaining it. Thank you. Being a sparky tough would think i knew that, sadly no. I have another question. . . I need to extend the three cables from the motor. . .Is it special cable or can i use 1.5mm stranded singles (heat resistant of course) thanks again for the reply.
Ade
Frank Skilbeck03/09/2013 13:07:02
avatar
4811 forum posts
107 photos

No problem extedning the cables between the motor and ESC, best to use the same gauge wire. You need to be carefull if you are extending the wires from then ESC to the battery it can cause the input capacitors to fail.

PatMc03/09/2013 14:26:48
avatar
4470 forum posts
548 photos

If you intend soldering the extension wires it's important not to cut back any of the original wires. De-solder any connectors then solder the new to the old soldered section with heatshrink over the joints.
OTOH you might consider using connectors for the extension.

Ade Eades (Eadsie)03/09/2013 17:54:44
avatar
108 forum posts
17 photos

Thanks, just motor cables, i have soldered the three cables with some success and the heat shrink looks sound. the electrics are now all in-situ so should be able to take test flight No.2 soon.

Ade

All Topics | Latest Posts

Please login to post a reply.

Support Our Partners
electricwingman 2017
Sussex Model Centre
CML
Slec
Sarik
Advertise With Us
Latest "For Sale" Ads
NEW POLL - has the pandemic altered your event safety perceptions?
Q: Has the covid pandemic deterred you from attending shows and events in 2021?

 No, I'll be attending just as many as I usually do
 No, but I'll choose my event with greater care
 Yes, I'll attend fewer events going forward
 Yes, I wont attend any where previously I have

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E!