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Old May 21, 2010, 06:48 PM
flyvertigo
Orlando FL
Joined Aug 2009
455 Posts
Quote:
Originally Posted by ajbaker View Post
Yes. I think so. I did it too, on one of my EZ*'s. Actually, it would work equally as well on a SkyS. I will probably use this on one of my other SkyS ARF's.
AJ
That looks good after the paint.
Seems like the size is a little overkill.
Where did you exhaust it?

Jim
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Old May 21, 2010, 06:54 PM
flyvertigo
Orlando FL
Joined Aug 2009
455 Posts
Quote:
Originally Posted by 2500GENE View Post
On my Wild Hawk I put it on the side for cooling and simpler to swap motors.
I like the way you ran it along the side.
Keeps it clean looking.
Here is my WH.

Jim
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Old May 21, 2010, 07:20 PM
Why so serious?
2500GENE's Avatar
United States, FL, Cape Coral
Joined Dec 2007
5,972 Posts
Quote:
Originally Posted by ajbaker View Post
Yes. I think so. I did it too, on one of my EZ*'s. Actually, it would work equally as well on a SkyS. I will probably use this on one of my other SkyS ARF's.
AJ
Your exit should be 3 times the area of your intake to remove the heat and not cause a drag.

and in other news.....

A ESC is two separate parts. A pulse generator that provides current to the motor at a user controlled rate and a step down transformer to provide 5v to the servos and rx.

Hot Esc's with a linear BEC are caused by any one or combination of 3 reasons.

1. No or very little airflow around it, assuming it is the proper rating for the motor/prop you are using.

2. It's NOT the proper rating and you are drawing more amps through it then it can handle. (short life)

3. The BEC is linear which means it uses a resistor in it to lower the 3 cell battery (12.6v) to 5v to power the 4 servos and rx unit. A resistor lowers voltage by converting electrical energy into heat energy. Most ESCs with a internal linear BEC are only 1 or 1.5 amps and on a 4 servo 1 rx plane it is working at its max if not beyond it.

What to do? Again, 3 things.

1. Mount it outside to get rid of the heat and hope for the best.

2. Use a switching BEC esc that dosen't use a resistor but electronics to rapidly switch the 12.6v to an average 5v with little if any heat being created. When using these they should be kept as far away as possible (2-3 inches) from the rx since the cheaper ones creates RF interference. The better ones have internal filters for RF. Amp rating on these are generally higher.

3. Use a UBEC which is a external power source for you servos and rx. This takes all the servo and rx load off the esc. The better ones have filtering for RF noise and if you esc ever dies in flight, you will still have control or your servos and the rx remains powered on. Best choice for FPV flying since EMI and RF effect your video downlink as well as your RC link.

Q

ps, something to read. from a good company.

http://www.dimensionengineering.com/BECFAQ.htm
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Last edited by 2500GENE; May 21, 2010 at 08:38 PM.
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Old May 21, 2010, 09:00 PM
flyvertigo
Orlando FL
Joined Aug 2009
455 Posts
Excellent summary and link.

Thanks, Jim
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Old May 21, 2010, 11:38 PM
Argue for your limitations
ajbaker's Avatar
Lincoln, CA
Joined Oct 2006
8,422 Posts
Quote:
Originally Posted by flyvertigo View Post
That looks good after the paint.
Seems like the size is a little overkill.
Where did you exhaust it?

Jim
I get asked that a lot. If you look at pics #3 & #5, you will see that I lowered the fuselage by 3/16" all around. It must be enough because the canopy never gets blown off. It is roughly 2 times larger than the intake.
AJ
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Old May 21, 2010, 11:41 PM
Argue for your limitations
ajbaker's Avatar
Lincoln, CA
Joined Oct 2006
8,422 Posts
Quote:
Originally Posted by 2500GENE View Post
On my Wild Hawk I put it on the side for cooling and simpler to swap motors.
I added your mod to Page #1 of the thread. Nicely done.
AJ
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Old May 22, 2010, 01:56 AM
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Quote:
Originally Posted by flyvertigo View Post
I like the way you ran it along the side.
Keeps it clean looking.
Here is my WH.

Jim
Is that the supersonic V2 motor?? can you do a flightreview on that???
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Old May 22, 2010, 04:56 AM
flyvertigo
Orlando FL
Joined Aug 2009
455 Posts
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Originally Posted by pavcon View Post
Is that the supersonic V2 motor?? can you do a flightreview on that???
Yes it is. The motor and Esc never gave me any problems.
The air frame needs to be reinforced to handle the power and speed.
I modified it as per RCPowers.

Wild Hawk 54" Electric RC Airplane - Jim's Flight (8 min 36 sec)
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Old May 22, 2010, 04:58 AM
flyvertigo
Orlando FL
Joined Aug 2009
455 Posts
Quote:
Originally Posted by ajbaker View Post
I get asked that a lot. If you look at pics #3 & #5, you will see that I lowered the fuselage by 3/16" all around. It must be enough because the canopy never gets blown off. It is roughly 2 times larger than the intake.
AJ
Yes, I see that.

Thanks, Jim
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Old May 22, 2010, 06:42 AM
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see that power??? absolutely love it...
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Old May 23, 2010, 10:39 PM
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Leesburg, VA
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The Sky Surfer aint too cool. Check out my experience here: Page 6 and 7.

http://www.rcgroups.com/forums/showt...1225841&page=6
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Old May 23, 2010, 10:51 PM
First to go over 106K feet
Crist Rigotti's Avatar
USA, IA, North Liberty
Joined Mar 2008
2,479 Posts
Here's my Sky Surfer that I use for FPV. I bought a fuselage, horizontal and verical tail. I'm using Easy Star wings because BH was out of them at the time of my order.

http://www.rcgroups.com/forums/showp...9&postcount=10
http://www.rcgroups.com/forums/showp...4&postcount=11
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Old May 24, 2010, 01:18 AM
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Originally Posted by TopSpin View Post
The Sky Surfer aint too cool. Check out my experience here: Page 6 and 7.

http://www.rcgroups.com/forums/showt...1225841&page=6
Top Spin I have answered you on that other thread. Wondering around the threads and posting things like that won't do any good to your problem. contact BH or sralyn at BHSara09@banahobby.com and your problem will be resolved.

only problem is that you assembled the plane even with a bend fuselage. and it's not BHs fault if UPS used the box for a chair or something but im almost 100% positive thatthey will help you.
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Old May 24, 2010, 12:28 PM
Argue for your limitations
ajbaker's Avatar
Lincoln, CA
Joined Oct 2006
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Quote:
Originally Posted by TopSpin View Post
The Sky Surfer aint too cool. Check out my experience here: Page 6 and 7.

http://www.rcgroups.com/forums/showt...1225841&page=6
You have a valid claim against UPS. I cannot see any way at all that BH is at fault for the damage. I got the same plane in the same box for two different orders and they arrived in perfect condition. File the claim.
AJ
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Old May 24, 2010, 12:39 PM
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Leesburg, VA
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Originally Posted by ajbaker View Post
You have a valid claim against UPS. I cannot see any way at all that BH is at fault for the damage. I got the same plane in the same box for two different orders and they arrived in perfect condition. File the claim.
AJ
That particular foam is a thermal setting polymer. There is nothing that UPS could have done to cause a permanent bend in it as it would simply spring back. This happened at the manufacturer and since the servos are already installed the usual fixes of heat or boiling water are out of the question as that would most likely destroy the servos.

I'll call BH and see what they are willin to do and post the response here.
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