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Old Feb 25, 2013, 11:15 PM
rajeev is offline
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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 !!!!
Last edited by rajeev; Feb 25, 2013 at 11:39 PM.
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Old Feb 26, 2013, 02:12 AM
Blaser is offline
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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 !!!!
Old Feb 26, 2013, 06:56 AM
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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.
Old Feb 26, 2013, 11:09 AM
tele1974 is offline
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EPP Full fuse plans? Anyone?
Old Feb 26, 2013, 03:27 PM
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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.
Old Feb 26, 2013, 03:35 PM
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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...
Old Mar 01, 2013, 10:29 PM
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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
Old Mar 09, 2013, 04:17 PM
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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....
Old Mar 10, 2013, 03:22 PM
joker24458 is online now
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Soooo.....any new info on 3mm depron Yaks?

-joker
Old Mar 10, 2013, 03:29 PM
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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?
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Latest blog entry: BluFO review by Jim T Graham
Old Mar 10, 2013, 03:43 PM
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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
Old Mar 10, 2013, 03:56 PM
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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
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Old Mar 10, 2013, 04:31 PM
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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)
Old Mar 10, 2013, 04:49 PM
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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
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Latest blog entry: BluFO review by Jim T Graham
Old Mar 10, 2013, 05:51 PM
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Ok, sounds cool.

-joker