Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Feb 25, 2013, 10:15 PM
Registered User
Joined Jul 2004
13 Posts
Hi guys! I am planning on building the 32.5" version using 6mm depron with a 3s battery and 8045 prop for outdoor flying. I want this one to be light and slow and as much 3d-ish as possible. Request your advice on the motor. I have heard lots of good reports on HK 2730 but I am trying to stick to what is available locally (HK Australian warehouse) to keep the costs down. So, here are my options:

Option 1: Turnigy Park300 Brushless Outrunner 1600kv
Battery: 2~3 Cell /7.4~11.1V
RPM: 1600kv (Isn't this a bit too high for a light and slow 3d?)
Max current: 9A
Weight: 25g (not including connectors)

Option 2: Turnigy Park300 Brushless Outrunner 1380kv
RPM: 1380kv
Max current: 7A (77 watts? Isn't this a bit low?)
Current capacity: 9A/15sec
Weight: 24g (not including connectors)

Option 3: hexTronik 24gram Brushless Outrunner 1300kv
Kv - 1300rpm/v
Max Load: 7.5A (Isn't this a bit low too?)
Thrust: 400g+
Weight: 20g

So what do you think will be a good motor for my new Yak?

LF, a big thanks for the beautiful plane !!!!
rajeev is offline Find More Posts by rajeev
Last edited by rajeev; Feb 25, 2013 at 10:39 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 26, 2013, 01:12 AM
Registered User
Blaser's Avatar
Joined Mar 2012
200 Posts
I like the 2730 1300kv with a 8x4gws dd @7.5 amps 500 grams thrust and if you like a lot more power 9x5 @ 10 amp 590 g. of thrust this is what I use but the 1500kv with a 8x4 DD works great

http://www.hobbyking.com/hobbyking/s...er_1500kv.html

Quote:
Originally Posted by rajeev View Post
Hi guys! I am planning on building the 32.5" version using 6mm depron with a 3s battery and 8045 prop for outdoor flying. I want this one to be light and slow and as much 3d-ish as possible. Request your advice on the motor. I have heard lots of good reports on HK 2730 but I am trying to stick to what is available locally (HK Australian warehouse) to keep the costs down. So, here are my options:

Option 1: Turnigy Park300 Brushless Outrunner 1600kv
Battery: 2~3 Cell /7.4~11.1V
RPM: 1600kv (Isn't this a bit too high for a light and slow 3d?)
Max current: 9A
Weight: 25g (not including connectors)

Option 2: Turnigy Park300 Brushless Outrunner 1380kv
RPM: 1380kv
Max current: 7A (77 watts? Isn't this a bit low?)
Current capacity: 9A/15sec
Weight: 24g (not including connectors)

Option 3: hexTronik 24gram Brushless Outrunner 1300kv
Kv - 1300rpm/v
Max Load: 7.5A (Isn't this a bit low too?)
Thrust: 400g+
Weight: 20g

So what do you think will be a good motor for my new Yak?

LF, a big thanks for the beautiful plane !!!!
Blaser is offline Find More Posts by Blaser
Reply With Quote
Old Feb 26, 2013, 05:56 AM
Winging it >
leadfeather's Avatar
Joined May 2006
9,468 Posts
Quote:
Originally Posted by rajeev View Post
Hi guys! I am planning on building the 32.5" version using 6mm depron with a 3s battery and 8045 prop for outdoor flying. I want this one to be light and slow and as much 3d-ish as possible. Request your advice on the motor. I have heard lots of good reports on HK 2730 but I am trying to stick to what is available locally (HK Australian warehouse) to keep the costs down. So, here are my options:

Option 1: Turnigy Park300 Brushless Outrunner 1600kv
Battery: 2~3 Cell /7.4~11.1V
RPM: 1600kv (Isn't this a bit too high for a light and slow 3d?)
Max current: 9A
Weight: 25g (not including connectors)

Option 2: Turnigy Park300 Brushless Outrunner 1380kv
RPM: 1380kv
Max current: 7A (77 watts? Isn't this a bit low?)
Current capacity: 9A/15sec
Weight: 24g (not including connectors)

Option 3: hexTronik 24gram Brushless Outrunner 1300kv
Kv - 1300rpm/v
Max Load: 7.5A (Isn't this a bit low too?)
Thrust: 400g+
Weight: 20g

So what do you think will be a good motor for my new Yak?

LF, a big thanks for the beautiful plane !!!!
Any of those motors may work fine. It's all about trade offs.

The weight of the HXT 2730 is more like 27 grams, not 20 grams listed for the motor. Some motors have built in prop savers and motor mounts, so I include prop saver and motor mount in the weight for a good "as installed" comparison.

Trade offs:

In general; as kV goes up; use smaller prop, prop torque goes down, static thrust efficiency goes down, maximum power available goes up, top speed goes up.

In general; as kV goes down; more static thrust efficiency, less amps to hover, smaller esc and battery possible (weight savings), bigger prop and more prop torque,

Also properly designed 2s system ( system means correctly matched prop, motor, esc and battery) will have better static thrust efficiency than 3s system.

For slow and floaty flying that you want, light weight is the key.

If you do a really good job keeping the air frame light, you may even be able to drop a motor size, and smaller battery and esc too for more weight savings. You have to work a lot harder to do this successfully.
leadfeather is online now Find More Posts by leadfeather
Reply With Quote
Old Feb 26, 2013, 10:09 AM
Registered User
tele1974's Avatar
USA, OH, Olmsted Falls
Joined Feb 2007
859 Posts
EPP Full fuse plans? Anyone?
tele1974 is offline Find More Posts by tele1974
Reply With Quote
Old Feb 26, 2013, 02:27 PM
Registered User
Jack the R's Avatar
Joined Aug 2009
1,663 Posts
Quote:
Originally Posted by balesse View Post
and I like the tube better than the Foam Tac bottle.
Yep - love the glue, hate the bottle.
Jack the R is offline Find More Posts by Jack the R
Reply With Quote
Old Feb 26, 2013, 02:35 PM
Registered User
Markran's Avatar
United States, CA, Sacramento
Joined Aug 2011
592 Posts
Quote:
Originally Posted by WMParkFlyer View Post
We have been using and selling foam Tac for over 6 months now on EPP as well as depron. I placed a glue hinge in direct sunlight as well as heat ... on the dash of my car ... there was Zero discoloration and no degradation of the glue hinge.

GM
WMParkFlyers.com
Thanks, that was exactly the confirmation I've been wanting to hear. BTW, the plane that yellowed from the Welders is the first I used it on, my beloved McFoamy XL...
Markran is offline Find More Posts by Markran
Reply With Quote
Old Mar 01, 2013, 09:29 PM
Registered User
Joined Jan 2013
12 Posts
yet again

yes i said it yet again. Im going to start witht he 19 in and work my way up building all the sizes. build and fly till i get bored with one and on to the next
nhibberts is offline Find More Posts by nhibberts
Reply With Quote
Old Mar 09, 2013, 03:17 PM
Don't cut the Yellow Wire
dr.E's Avatar
Ridgewood ,NJ
Joined Jan 2000
3,518 Posts
Quote:
Originally Posted by Markran View Post
Thanks, that was exactly the confirmation I've been wanting to hear. BTW, the plane that yellowed from the Welders is the first I used it on, my beloved McFoamy XL...
Welders should have come with an UV stabilizer(HMMM?).... For my PSS Sloper airplanes I used to use Goop but that yellowed too untill the guys started using Marine Goop... Those are powerfull fumes though....
dr.E is offline Find More Posts by dr.E
Reply With Quote
Old Mar 10, 2013, 02:22 PM
Whatever goes up must go BOOM
joker24458's Avatar
United States, OH, Kent
Joined Mar 2012
2,111 Posts
Soooo.....any new info on 3mm depron Yaks?

-joker
joker24458 is offline Find More Posts by joker24458
Reply With Quote
Old Mar 10, 2013, 02:29 PM
Kit Manufacturer
coreman's Avatar
United States, MA, Southbridge
Joined Feb 2010
3,478 Posts
Quote:
Originally Posted by joker24458 View Post
Soooo.....any new info on 3mm depron Yaks?

-joker
I have the carbon figured out and should have some kits at Toledo. I'm hoping to do the picture build for the instructions in the next week. Surprise blizzard on friday put a damper on my schedule this week. Are you looking for painted or unpainted?
coreman is offline Find More Posts by coreman
RCG Plus Member
Old Mar 10, 2013, 02:43 PM
Whatever goes up must go BOOM
joker24458's Avatar
United States, OH, Kent
Joined Mar 2012
2,111 Posts
Well, I am not sure. I might buy a 3mm Yak later this year (yeah....another delay ) because I just bought a Twisted Hobbies Crack Yak, used up all my allowance (I do not regret that at all, though, the CY is great! ). But speaking about later this year, it depends on the color scheme. I will most likely buy it painted though, I would not like to ruin a nice LF Yak because I painted it badly. For the meantime, though, are there any new videos?

Thanks,

-joker
joker24458 is offline Find More Posts by joker24458
Reply With Quote
Old Mar 10, 2013, 02:56 PM
Kit Manufacturer
coreman's Avatar
United States, MA, Southbridge
Joined Feb 2010
3,478 Posts
I have another video from 2 weeks ago I need to finish editing and upload. Soon

Are you going to Toledo? if so, stop by the National Balsa booth and say Hi
coreman is offline Find More Posts by coreman
RCG Plus Member
Old Mar 10, 2013, 03:31 PM
Whatever goes up must go BOOM
joker24458's Avatar
United States, OH, Kent
Joined Mar 2012
2,111 Posts
Yes, I am definitely going to Weak Signals on the 6th (Saturday) and I will definitely look for National balsa and say hi.

-joker AKA Andres (real name)
joker24458 is offline Find More Posts by joker24458
Reply With Quote
Old Mar 10, 2013, 03:49 PM
Kit Manufacturer
coreman's Avatar
United States, MA, Southbridge
Joined Feb 2010
3,478 Posts
Quote:
Originally Posted by joker24458 View Post
Yes, I am definitely going to Weak Signals on the 6th (Saturday) and I will definitely look for National balsa and say hi.

-joker AKA Andres (real name)
Very cool. See you then/there
Jim
coreman is offline Find More Posts by coreman
RCG Plus Member
Old Mar 10, 2013, 04:51 PM
Whatever goes up must go BOOM
joker24458's Avatar
United States, OH, Kent
Joined Mar 2012
2,111 Posts
Ok, sounds cool.

-joker
joker24458 is offline Find More Posts by joker24458
Reply With Quote
Reply


Thread Tools