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Old Dec 14, 2009, 10:16 PM
For the Birds
Stagger_Wing's Avatar
California
Joined Jul 2004
400 Posts
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Originally Posted by lonelasso View Post
Which pack ? 2x4S-2350s (parallel). I'm using the 4020-10 w/15x8 APC. 75A/1060W SS 100A ESC
4s 3700. How do you like the 15x8?
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Old Dec 15, 2009, 07:45 AM
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United States, TX, Austin
Joined Dec 2006
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Originally Posted by Stagger_Wing View Post
4s 3700. How do you like the 15x8?
First impressions were....barely hold a hover on 15x6. So, ordered 16x8 xoar. Better. Did amp draw and turns out the 4S2P 4000 $10 special is probably 12c Showed only 600 W Paired up 4S 2350 25c from my Slick and getting the current numbers
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Old Dec 15, 2009, 07:57 AM
Don't watch this...
CooHead's Avatar
Northern IL
Joined Oct 2003
5,583 Posts
Quote:
Originally Posted by lonelasso View Post
...Paired up 4S 2350 25c from my Slick and getting the current numbers
Yea...I was thinking of paralleling up a couple Rhino 4S2350 packs from my Slick for my 55"Edge. Just to see what kind of prop I can spin and not over amp the ESC. It's a -950Kv Motrofly, so think I'll be restricted down to some 13" prop to stay under 80amp.

But I'd just use those two P'd packs on the ground to try some wattmeter numbers. I'd think it would be awefully heavy with two of those in there. They are not the lightest packs around. Sure the plane would fly...it flys with a big old camera strapped to it. But not real 3Dish.

Guess I'm just so used to the lighter 3S3700 that makes 800watts (70+amps) with 15x7.

Just thinking/looking what motor to get for my X-mas present 57"SC. It'll be 4S and I I sure like a 15" prop. 14" prop seems small for this 57" plane.

10"=SA Groove
12"=42" Edge
13"=47" SHP/Velox
14"=51" Slick
15"=55" Edge

Is 15" the defacto size prop to aim at with this 57" plane? I know it depends on everything. But are most spinning a 15"? 14" 16?!

Can't wait to get mine.

Coo
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Old Dec 15, 2009, 08:08 AM
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United States, TX, Austin
Joined Dec 2006
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Quote:
Originally Posted by CooHead View Post
Yea...I was thinking of paralleling up a couple Rhino 4S2350 packs from my Slick for my 55"Edge. Just to see what kind of prop I can spin and not over amp the ESC. It's a -950Kv Motrofly, so think I'll be restricted down to some 13" prop to stay under 80amp.

But I'd just use those two P'd packs on the ground to try some wattmeter numbers. I'd think it would be awefully heavy with two of those in there. They are not the lightest packs around. Sure the plane would fly...it flys with a big old camera strapped to it. But not real 3Dish.

Guess I'm just so used to the lighter 3S3700 that makes 800watts (70+amps) with 15x7.

Just thinking/looking what motor to get for my X-mas present 57"SC. It'll be 4S and I I sure like a 15" prop. 14" prop seems small for this 57" plane.

10"=SA Groove
12"=42" Edge
13"=47" SHP/Velox
14"=51" Slick
15"=55" Edge

Is 15" the defacto size prop to aim at with this 57" plane? I know it depends on everything. But are most spinning a 15"? 14" 16?!

Can't wait to get mine.

Coo
Doc Austin using 16x8 on his 57" , but 15x6/8 seems to be preferred.
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Old Dec 15, 2009, 08:11 AM
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United States, MN, Apple Valley
Joined Jan 2004
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Quote:
Originally Posted by CooHead View Post
It's a -950Kv Motrofly, so think I'll be restricted down to some 13" prop to stay under 80amp.
Coo-
Is this the 2820-950? Or 2825-950?
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Old Dec 15, 2009, 08:12 AM
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United States, TX, Austin
Joined Dec 2006
13,752 Posts
Quote:
Originally Posted by CooHead View Post
Yea...I was thinking of paralleling up a couple Rhino 4S2350 packs from my Slick for my 55"Edge. Just to see what kind of prop I can spin and not over amp the ESC. It's a -950Kv Motrofly, so think I'll be restricted down to some 13" prop to stay under 80amp.

But I'd just use those two P'd packs on the ground to try some wattmeter numbers. I'd think it would be awefully heavy with two of those in there. They are not the lightest packs around. Sure the plane would fly...it flys with a big old camera strapped to it. But not real 3Dish.

Guess I'm just so used to the lighter 3S3700 that makes 800watts (70+amps) with 15x7.

Just thinking/looking what motor to get for my X-mas present 57"SC. It'll be 4S and I I sure like a 15" prop. 14" prop seems small for this 57" plane.

10"=SA Groove
12"=42" Edge
13"=47" SHP/Velox
14"=51" Slick
15"=55" Edge

Is 15" the defacto size prop to aim at with this 57" plane? I know it depends on everything. But are most spinning a 15"? 14" 16?!

Can't wait to get mine.

Coo
Coo,
Use the 'search this thread' for 15x8
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Old Dec 15, 2009, 09:30 AM
Just "hanging" Around
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Richmond, VA
Joined Oct 2009
1,589 Posts
I am spinning 14x7 on one of my 330 SCs and 16x8 on the other one. I have not had any issues with 14x7.
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Old Dec 15, 2009, 01:05 PM
TEAM CANUCKER HUCKER
ssflylow's Avatar
Canada, AB, Medicine Hat
Joined Sep 2003
1,636 Posts
My GR-60 was pulling 1100 watts and 87 amps with a xoar 16x8. Went to a xoar 15x8 and the watts dropped to 980 and the amps down to 73. Needless to say I stuck with the 15x8 as the high amperage scared me. The esc was getting a wee toasty. Bateries are xcite (desire power) 4200 25c's.
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Old Dec 15, 2009, 01:46 PM
For the Birds
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California
Joined Jul 2004
400 Posts
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Originally Posted by Shawnlh View Post
My GR-60 was pulling 1100 watts and 87 amps with a xoar 16x8. Went to a xoar 15x8 and the watts dropped to 980 and the amps down to 73. Needless to say I stuck with the 15x8 as the high amperage scared me. The esc was getting a wee toasty. Bateries are xcite (desire power) 4200 25c's.

Wow, that amp draw seems low for the GR60. Are you running 3s? My 4s GR60 setup pulled ~90 amps with a 14x8.5 and 85 amps with a 15x6.
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Old Dec 15, 2009, 03:03 PM
TEAM CANUCKER HUCKER
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Canada, AB, Medicine Hat
Joined Sep 2003
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Quote:
Originally Posted by Stagger_Wing View Post
Wow, that amp draw seems low for the GR60. Are you running 3s? My 4s GR60 setup pulled ~90 amps with a 14x8.5 and 85 amps with a 15x6.
No, that's on 4s. I'm thinking the packs may be getting tired. Going to order some Hyp. cx 4000 4s's and see what happens.
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Old Dec 15, 2009, 04:35 PM
Don't watch this...
CooHead's Avatar
Northern IL
Joined Oct 2003
5,583 Posts
Quote:
Originally Posted by mattk0 View Post
Coo-
Is this the 2820-950? Or 2825-950?
Hey Matty.
It's the 2825-950. It is a great motor and the new threaded prop adapter and upgraded bearings are right on. -950Kv is a bit hi. I like the 800watts at 70+ amps with 15x7 on it versus maybe 1000watts and 70amps a 14x7 would net. (I'm guessing at those numbers as I haven't actually switched props to the smaller 14x7 or 13x6.5 and two 4S packs. I did try it (14x7 4S) some time ago when it was in the 55"SHP and remembered bailing pretty quick as it was over 80amps....but should try again).

I never go to the full limit of the weakest component (motor amp, ESC amp, battery amp). I set it up to pull less than max of the lowest component's limit.

For the 57"SC, I want to go 4S. I'd like a 15" prop. Been looking at the 36xx motors from Ken's SubSonic.

On the other hand.....The more I read, the more I see many do push the upper limit of some componants. Maybe run over the 80amp mark with the AB80 because "only draws that much durring the first minute of the pack." "can limit amp draw with throttle." "It's only that much for a burst." Those kinds of reasoning. That is why I was curious what this -950 motor would pull in a 4S set up versus the 3S it flys now.

As stated previously, I like the motor and 800w power in this plane just fine.
I will set up the new 57"SC to be 4S and more power, maybe 1000ish watts.

Thanks all
CooHead
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Old Dec 16, 2009, 10:05 PM
The Animal
redding ca.
Joined Aug 2008
39 Posts
Quote:
Originally Posted by flyinhigh025 View Post
Time for setting the CG and a few final checks.

The manual calls out for setting the initial maiden CG at 108mm behind the leading edge of the wing where it meets the fuselage. This is a good idea.

The manual also gives 120-125mm for the preferred 3D CG range. So after flying many different Scott Stoops 3DHS designs I feel comfortable starting off at 120mm. I don't really recommend this, but I am comfortable flying with AFT CG's. (You should see the CG on my 87" SHP! )

Remember to do a few final checks like making sure the control surfaces are moving in the correct direction. I find this is easiest done at home before the chaos of the maiden piles up in the morning. You know, guys heckling you, threatening to take video of my less than stellar flying... hahah

I will report back tomorrow evening with maiden results and who knows, maybe a video or two...

HAPPY FLYING!
3DHS ROCKS!!!
-Jeff
Jeff, who makes this balancer? thanks
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Old Dec 16, 2009, 10:18 PM
shredding Ultracote since 2009
routemech's Avatar
Frederick CO
Joined Jul 2009
338 Posts
Quote:
Originally Posted by blucor basher View Post
Dennis - Use a throttle-rudder mix instead of adding washers to the motors, IMO, easier to tune and just as effective.
What % of throttle-rudder mix do you use... I have never done this and was going to try it, what is a ball park setting.

Thanks
Mike
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Old Dec 16, 2009, 10:24 PM
shredding Ultracote since 2009
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Frederick CO
Joined Jul 2009
338 Posts
Quote:
Originally Posted by l. brown View Post
Jeff, who makes this balancer? thanks
l. brown,

I borrowed Jeff's balancer a while back to balance my Edge, I think this is the one Jeff has:

http://www.greatplanes.com/accys/gpmr2400.html


Mike
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Last edited by routemech; Dec 16, 2009 at 10:32 PM.
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Old Dec 16, 2009, 10:46 PM
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Tx
Joined Oct 2008
1,007 Posts
Quote:
Originally Posted by routemech View Post
What % of throttle-rudder mix do you use... I have never done this and was going to try it, what is a ball park setting.

Thanks
Mike
IMO - Start at 2-3% right rudder to full throttle and increase as needed. If you need help making the mix or getting the mix setup right, let me know. I'll probably be down around that area at some point throughout the weekend. I know there's other guys at LAMA who use that mix and would probably be glad to help as well.
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