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Jan 29, 2007, 11:59 PM
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KatManDEW's Avatar
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Discussion

Motor for a 72 inch, 12 pound Sohkoi?


And suggestions for a motor for a 72 inch Suhkoi which is going to weigh somewhere in the 12 to 12.5 pound range, RTF? I think it's an old OMP kit.

Thanks.
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Jan 30, 2007, 03:32 PM
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Danny
Last edited by F1 Rocket; Jan 30, 2007 at 09:20 PM.
Jan 30, 2007, 03:33 PM
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I'm using a Hacker A60-18M on 12s in my 74" Yak. Tons of power (3400ish watts on a 19x10 apc-e) and everything runs cool as well. The same motor on 10s and a bit more prop would also work.

Danny
Jan 31, 2007, 02:47 PM
Registered User
I have powered my old Super Emarauld of WM with ( a very stout and conventionally built up for big 4 cyc120. : AVEOX 3638-1,5 +5,2:1 pgb, then later with a ORBIT 30-12 , then tried a China made big outrunner which has similar sized to axi 5330, all works ok at ~1500-1800w. with 8-9S.
If 2000-2500w is needed , and wing is big enough, I would try the big BL120 from ASTROFLIGHT,.....
David
Jan 31, 2007, 04:58 PM
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GWRIGHT's Avatar
I've flown Danny's and it has BIIIIG POWER!

I flew sean's QQ yak last sunday at the arizona event also. He only has the short A60 in it and it also has plenty of poop. I just wish I'd checked aileron direction before the first takeoff No,.. i didn't crash it, but it was inverted and upright, back and forth about 1/2 dozen times after takeoff, before it reached the other end of the runway, then I figured out what was wrong. I slowed it down, concentrated, and circled around and landed with the ailerons reversed. I can't believe how difficult that is. Wasn't pretty, but it's still in one piece. The A60S on 10S lipo was plenty, and it should be about the same weight as yours.
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Jan 31, 2007, 10:18 PM
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KatManDEW's Avatar
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Thanks for all the suggestions!

I forgot to mention that we were looking at the Hacker outrunners, the E-Flite 160, and the Axi 5330.

Any others, like Hyperion?
Feb 01, 2007, 09:09 PM
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callen's Avatar
Quote:
Originally Posted by KatManDEW
And suggestions for a motor for a 72 inch Suhkoi which is going to weigh somewhere in the 12 to 12.5 pound range, RTF? I think it's an old OMP kit.

Thanks.
I fly a Goldberg 72.5 inch Sukhoi with a Axi 5330/18 and 18x10 prop. I have two set ups. One at 13.6 lbs and the other at 14.6 lbs. First is Tanic 10s1p5000mah and the other is Tanic 10s2p6500mah. More than enough power with either set up. Will hover all day but I don't hover it too low. Will climb straight up out of sight.
Feb 02, 2007, 09:34 AM
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mungrelv8ute's Avatar
Check out the new motors from Hacker in their 2007 cataloge which you can download from the German site. Can you say 200! Wow! (always thought those quads were a waste of time...)
Feb 02, 2007, 07:49 PM
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hcuellart's Avatar
I was using an Actro 40-4 on 10S till last month when the receiver battery decided to die... Luckily the plane landed on a tree and everything was in good shape except for the plane of course... It had lots and lots of power... It was a Goldberg Sukhoi...
Last edited by hcuellart; Feb 02, 2007 at 07:59 PM.
Feb 03, 2007, 02:22 AM
Is weight going to be an issue? At these power levels, a geared inrunner will be a good bit lighter.

That Hacker A60-18M weighs 24 ounces and has a recomended peak of 55 amps on 10S for about 1925 watts.

My Neu 1515 with gearbox weighs about 15 ounces and is running on 12S at just over 3100 watts in my Ultimate.

Outrunners have thier advantages ofcourse - cost and simplicity.

On the other hand, 9 ounces is 9 ounces

If you want to drop even more weight and stay at the Hacker power level, go with a 1512.

Larry

Larry
Feb 03, 2007, 02:27 AM
The geared Neu will run about $315 for the 1512 and the Hacker is $250. The 1512 is going to be about 12 ounces lighter and put out a bit more power - 300-400 watts at a guess.

Larry
Feb 03, 2007, 02:37 AM
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mungrelv8ute's Avatar
I think the Hacker power levels for the outrunners are understated.

I have a Hyperion Yak54 running a Hacker A60-16M, 10S2P and an APC-EW 19x12, with this combination I see peaks as high as 3600W. Hacker state 2600W as a safe maximum but I have had at least 50+ flights and the motor never gets hotter than 60-65 degrees. I think these new large outrunners could very well be extremely powerful.
Feb 03, 2007, 02:44 AM
But heavy

Larry
Feb 03, 2007, 02:47 AM
On the other hand - Sukoi's often NEED nose weight to balance, so maybe you need the Hacker's heft

Larry
Feb 05, 2007, 09:27 PM
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KatManDEW's Avatar
Thread OP
The Hacker A60-16M sounds good, and looks good in Motocalc. The plane might indeed need the nose weight, and it could weigh up to 13 pounds, so the 16M may be the ticket for brute power, which is a primary concern for this build.


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