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Old Jan 07, 2010, 08:42 PM
Team 3DHS
CrashesALot's Avatar
Western CT
Joined Aug 2009
2,857 Posts
Okay guys, I haven't dug through the old posts, but to stir up another discussion, do you recommend the Hitec 7985's, or is anlaog fine (the 985's) -- will be on a futaba fasst 7c receiver.

Thanks!
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Old Jan 07, 2010, 09:01 PM
Go guerrilla
jfv61's Avatar
Austin, TX
Joined Jul 2005
4,899 Posts
AFIK, the HS-985MG is still Ben's suggested servo and IMO it is excellent. I tried the 985 and 7985 back to back on elevator on the 70" Slick and could not tell the difference (I wasn't doing any custom programming of the digital servo, that's one advantage the digital would offer). IMO, save your money and go with the analog.

JV
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Old Jan 07, 2010, 09:04 PM
Inanity-Free Zone
RCMC's Avatar
Delaware
Joined Jan 2006
545 Posts
DP and Ryan,

Thanks for the imput. Are your planes climbing nicely, with enough power?

RCMC
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Old Jan 07, 2010, 09:09 PM
Inanity-Free Zone
RCMC's Avatar
Delaware
Joined Jan 2006
545 Posts
Crashes,

I'm using the 985's and they are fast and accurate servos. I have installed a Dimension Engineering BEC that is switchable from 5 to 6 volts and I haven't had any issues. I am operating the servos on the 6 volt setting at Ben's recommendation. The 985's are pricey at $75.00 but they're worth it.

RCMC
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Old Jan 07, 2010, 09:23 PM
Fly Low-Crash-Rebuild-Repeat !
RotorJockey's Avatar
Jackson, MO
Joined May 2009
3,231 Posts
Quote:
Originally Posted by RCMC View Post
DP and Ryan,

Thanks for the imput. Are your planes climbing nicely, with enough power?

RCMC
Here's my set-up:

70" AJ Slick
Scorpion 4025-12
Originally Scorpion Commander 120amp ESC, changed to Ice 100amp ESC.
Zippy Flightmax 6s 5000mah 20c
Xoar 18x8

When I first ran the set-up with the Scorpion ESC it was pretty doggy. It would climb vertically out of a hover but just barely. I decided to change controllers because my 68" Velox with the same motor and an Ice 100 ESC was WAY more powerful with just a 17x8 Turnigy wood prop.

After I dropped the Ice controller in with the latest firmware, it was a completely different plane! It will now climb vertically from a hover with authority.

My Wattmeter fried during the time I was putting the Slick together, so I haven't watt-metered it yet, but my Velox was pulling 1850 watts at 82 amps. So I figured I'd be fine with the Xoar since alot of others were running the same set-up.

I actually wish I'd've found this one before I started buying motors:

http://www.innov8tivedesigns.com/pro...roducts_id=539

I think it's actually the perfect 6S motor for this application.

But that's just my opinion...

Fred
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Old Jan 07, 2010, 10:15 PM
TEAM CANUCKER HUCKER
ssflylow's Avatar
Canada, AB, Medicine Hat
Joined Sep 2003
1,636 Posts
Quote:
Originally Posted by RotorJockey View Post
I actually wish I'd've found this one before I started buying motors:

http://www.innov8tivedesigns.com/pro...roducts_id=539

I think it's actually the perfect 6S motor for this application.

But that's just my opinion...

Fred
I was looking at the 4035-330 for an 8s set-up. I had e-mailed Lucien to see if it was applicable and it'll work. The only downside is that it's 3 oz. heavier. Here's the numbers Lucien gave me on it. It's posted in the 72" extra thread as well.

S-4035-330 motor, 8s lipo, and 18x8 prop:

Amps 88

Watts 2534

RPM 8,550

Thrust 297 ounces (18 pounds 9 ounces)
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Old Jan 07, 2010, 10:42 PM
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CFisher1421's Avatar
Geneva, IL
Joined Jul 2007
1,506 Posts
Quote:
Originally Posted by RCMC View Post
-SNIP- On that page I was showing the installation of the Hacker 50-16S and X-80 Speed Control. My motor and speed control selection was based on early information that indicated that the Hacker system was the way to go. However, after a maiden flight in mid October the performance of the plane could only be discribed as "wanting." -SNIP-
DOH! You HAD to know that I just got ship confirmation on my 16S...!

I too noticed the kinda lukewarm choices for motors at the moment. I have really warmed up to the idea of a bolt on prop adapter. (Please no debates...I have collets...I've even made them work just fine...I just really, really prefer bolt-ons)

Question...if someone say...had access to some CNC equipment... ...that person could possibly have his cake and eat it to by cobbling up a bolton adapter. Is the Scorpion tapped with threads already on the bell housing?

Just a thought. I could just swallow and tolerate a collet i guess...
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Old Jan 07, 2010, 10:45 PM
Fly Low-Crash-Rebuild-Repeat !
RotorJockey's Avatar
Jackson, MO
Joined May 2009
3,231 Posts
Quote:
Originally Posted by Shawnlh View Post
I was looking at the 4035-330 for an 8s set-up. I had e-mailed Lucien to see if it was applicable and it'll work. The only downside is that it's 3 oz. heavier. Here's the numbers Lucien gave me on it. It's posted in the 72" extra thread as well.

S-4035-330 motor, 8s lipo, and 18x8 prop:

Amps 88

Watts 2534

RPM 8,550

Thrust 297 ounces (18 pounds 9 ounces)

3 ounces is just a little more than the weight of a servo.

You'll never even know the weight is there except that it is more powerful!

Fred
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Old Jan 07, 2010, 11:06 PM
TEAM CANUCKER HUCKER
ssflylow's Avatar
Canada, AB, Medicine Hat
Joined Sep 2003
1,636 Posts
Quote:
Originally Posted by RotorJockey View Post
3 ounces is just a little more than the weight of a servo.

You'll never even know the weight is there except that it is more powerful!

Fred
Well I'll give that power system a try and post the results.
I just have to figure out if I want the 70 slick, or wait for the 72 extra.
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Old Jan 08, 2010, 05:53 AM
Triple boxed goodness!
simon737's Avatar
United Kingdom, Doncaster
Joined Sep 2008
1,552 Posts
Motor - Scorpion 4025-12
ESC - CC110HV
Prop - Xoar 18x10
Battery - 6s5000 25C
Watts - 1980
Amps - 91
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Old Jan 08, 2010, 08:49 AM
Go guerrilla
jfv61's Avatar
Austin, TX
Joined Jul 2005
4,899 Posts
Quote:
Originally Posted by RotorJockey View Post
3 ounces is just a little more than the weight of a servo.

You'll never even know the weight is there except that it is more powerful!

Fred
Agreed, my A50-12L is 4 ounces more than the 16S and the plane is still very floaty feeling. There are video links in my blog.
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Old Jan 08, 2010, 08:55 AM
Go guerrilla
jfv61's Avatar
Austin, TX
Joined Jul 2005
4,899 Posts
Quote:
Originally Posted by CFisher1421 View Post
DOH! You HAD to know that I just got ship confirmation on my 16S...!
I'm very happy with the A50-16S in my 68" Velox (which is a little smaller/lighter), the 18x10 prop seems best. For the Slick I prefer a little more power.
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Old Jan 08, 2010, 09:56 AM
blucor basher's Avatar
United States, PA, Lancaster
Joined Jun 2003
24,141 Posts
RotorJockey's post above contains an important point. All of these motors in the 50S/4025 range are very similar. They are good up to about 1800-1850W. That's approx 200W/lb. on the slick. 200W/lb is good vertical. The larger motors, in the 50L or 4035 class, are good into the low-mid 2000's for wattage. This should provide extreme vertical if propped correctly. Make sure you are getting what you paid for, nobody should have less than 200W/lb at full throttle on any of these powerplant choices.
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Old Jan 08, 2010, 11:01 AM
doh!
ryan_m's Avatar
United States, AR, Little Rock
Joined May 2006
4,321 Posts
Quote:
Originally Posted by RCMC View Post
DP and Ryan,

Thanks for the imput. Are your planes climbing nicely, with enough power?

RCMC
yes. Plenty of power to pull out of a hover and accelerate vertically. Mine is actually on a lighter 68" Velox. (8.5lb vs. 9-9.5lb Slick), but I've got a friend with the same exact setup on a 70" Slick and his is plenty of power too. I've flown his a few times and like it. I don't have enough time on his to really tell the difference of whether you can feel the extra pound or so of weight between the two planes. I do know that he has plenty of pullout from a hover and can also accelerate vertically just fine.

That other Scorpion posted above, the 4035 might be a better choice if you really crave power. The Slick will handle the weight of the motor just fine. The 4025 is about an ounce lighter than the Reaper and Hacker I think, so the 4035 is only going to effectively be two ounces heavier that the other choices. I'm happy with the 4025 though. I suppose the 4035 would give a bit of headroom in not operating at the motors max recommended watts if ran at ~2000-2100 watts.
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Old Jan 08, 2010, 11:01 AM
Just "hanging" Around
3D-Dabbler's Avatar
Richmond, VA
Joined Oct 2009
1,589 Posts
Quote:
Originally Posted by jfv61 View Post
Agreed, my A50-12L is 4 ounces more than the 16S and the plane is still very floaty feeling. There are video links in my blog.
I checked out your videos. They were great. A couple of questions.

  • Are you taking it to full throttle in your Pull-outs?
    Because my impression is that it has good pullout with this motor but not extreme (per Ben's post). If it was full throttle, I don't think I would want to go with a motor that is any smaller than the A50-12L.
  • Does the A50-12L have a bolt on Prop adapter or collet?
  • Where did you buy / what is a good place to buy the A50-12L?
    I am looking for potential motors for my 72" 330 SC once it is released.
Thanks for the great videos!
-Mike
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