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Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

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Old 08-14-2013, 06:51 AM   #1
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Default Power setup for 30' Hellcat

Im after advice regarding a power setup for a scratch built Hellcat F6F. Im looking at a plane that will be a "floater" as opposed to a 3d flyer. The wingspan is 30' and the the airframe covered weighs only 70 grams. I expect the weight with everything in will be in the 120 gram range. Can any body suggest an affordable motor ESC combo from Hobbyking that will work? Here is a motor I liked the look of http://hobbyking.com/hobbyking/store...dProduct=14739 and the ESC http://hobbyking.com/hobbyking/store...idProduct=6548.

Any suggestions and advice will be welcome.

Thanks!!
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Old 08-14-2013, 08:24 AM   #2
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Originally Posted by nz builder View Post
Im after advice regarding a power setup for a scratch built Hellcat F6F. Im looking at a plane that will be a "floater" as opposed to a 3d flyer. The wingspan is 30' and the the airframe covered weighs only 70 grams. I expect the weight with everything in will be in the 120 gram range. Can any body suggest an affordable motor ESC combo from Hobbyking that will work? Here is a motor I liked the look of http://hobbyking.com/hobbyking/store...dProduct=14739 and the ESC http://hobbyking.com/hobbyking/store...idProduct=6548

Any suggestions and advice will be welcome.

Thanks!!
Hi The motor you linked to looks nice, but it only has a 2.3mm shaft, thats kind of weak, and I would stay away from HK ESC, IMHO they are not all that good, use turnigy plush or sentry ESC, they are pretty much Bullet proof IMHO. Its all that I use and never had any problems with them.

here is a nice micro motor that will work well with a 7x6 or smaller prop. This motor is used on a lot of planes, even multiple engine planes, its very powerful for its size, buy a few of these $6.00 motors, you will be glad you did, I use them all the time, I push these motors at 20+ amps all the time and they love it, use at least a 1300 mah lipo 30C rated,

http://hobbyking.com/hobbyking/store...cro_Motor.html


http://hobbyking.com/hobbyking/store...ontroller.html


http://hobbyking.com/hobbyking/store...Lipo_Pack.html


7x6 apc prop, you will have to drill out the center hole to fit the prop adapter, balance the props and sand down the sharp edges on the prop, they are like a knife.

http://hobbyking.com/hobbyking/store...rch=7x6%20prop


3mm prop adapter, cut the motor shaft down enough so the prop adapter sits flush with the motor bell when its sliped onto the motor shaft. Because the longer the motor shaft is, the easier it will bend in a hard landing/ crash. I would not use a prop saver with this motor, its a little to powerful for a prop saver to be used on it. it will put out up to 200+ Watts,

http://hobbyking.com/hobbyking/store..._Type_3MM.html

prop balancer

http://hobbyking.com/hobbyking/store..._Balancer.html

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Old 08-14-2013, 08:36 AM   #3
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My Friend Kosh is using this 1800 Kv micro motor in this plane, with a 7x6 apc prop and a 3 cell lipo, you can use it mild or wild, it all depends on how much throttle you want to give it


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Old 08-14-2013, 09:12 AM   #4
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Please post a pic of your plane

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Old 08-14-2013, 10:10 AM   #5
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Thanks for the info Chellie, i will post some pics soon.
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Old 08-14-2013, 02:17 PM   #6
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If your weight is correct I think that motor is WAY to heavy. I think you need to be looking for a 10g motor or so - maybe this:
http://hobbyking.com/hobbyking/store...nner_10g_.html

Your ESC too is much too large for 120g all up weight plane! That is SUPER light. I think you need a 5-6amp and again super light. Your power system (motor/esc/battery) should account for about ~35-45% of your all up weight. So that means your battery/ESC and motor should weight about 35-45g. With such a light plane shoot for the light end of that scale.

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Old 08-15-2013, 02:32 AM   #7
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Thirty foot wingspan??
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Old 08-15-2013, 02:12 PM   #8
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Originally Posted by Henry Sistrunk View Post
Thirty foot wingspan??
I am pretty sure he meant " not '.



But if he can make a 30' wingspan 120g Hellcat I want to see what he uses. (likely helium infused foam and balsa LOL)

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Old 08-17-2013, 06:05 AM   #9
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If it was that big Id be hoping in it! Na, its inches.
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Old 08-17-2013, 06:40 AM   #10
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LOL its 75 ounces! not grams. Yeah I would have had to infuse the balsa with helium to get the earlier results.
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Old 08-17-2013, 04:47 PM   #11
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So you are building a 75oz 30" wingspan Hellcat? Now you have REAL issues, that is about 5x what it should weigh.

Can you start over again? How big is the plane, how much is the planned weight. Something is simply not adding up here.

Confused....

Don't convert - if you are used to MM and grams just list that - we are smart enough to convert even though our silly nation isn't. It cracks me up that all through school we are metric, most work is metric, but in real US life we switch back to "old school". Baffling really, but I digress.

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Old 08-18-2013, 01:11 AM   #12
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I looked at my scales at home and found a setting that converts the reading to grams and got 214 grams (with 3 servos included). This sounds a little more realistic. I know this is correct as I compared this measurement with other objects that had a stated weight on them (jars of peanut butter etc). Any power set up suggestions based on this weight? Sorry for the confusion, Im normally more onto it!!
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Old 08-18-2013, 12:41 PM   #13
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So you have a 30 INCH wingspan and a weight of 214g correct?

If that is the case you have a light airplane and you should be able to get away with a 3s 1000 mAh battery and a 40-50g 100 watt motor.
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Old 08-18-2013, 02:41 PM   #14
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Originally Posted by nz builder View Post
I looked at my scales at home and found a setting that converts the reading to grams and got 214 grams (with 3 servos included). This sounds a little more realistic. I know this is correct as I compared this measurement with other objects that had a stated weight on them (jars of peanut butter etc). Any power set up suggestions based on this weight? Sorry for the confusion, Im normally more onto it!!
I Knew That you had a average weight plane for a 30" W/S and The power system in post #2 Still applies, even if you plane was a lite weight profile foam plane with a 30" W/S or a balsa build up with a 30" W/S the Power system in post 2 would still Apply, Its a All Around Power System that will give you great Performance, Take Care and Have Fun, Chellie

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Old 08-19-2013, 01:56 AM   #15
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Thanks for the great advice people. I will probably look at the setup that Chellie suggested.
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Old 10-27-2013, 04:08 AM   #16
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I checked the weight of the gear that Chellie suggested and while I agree that it would produce a fast plane I really want lighter gear installed if possible.
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Old 10-27-2013, 04:34 AM   #17
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Originally Posted by nz builder View Post
I checked the weight of the gear that Chellie suggested and while I agree that it would produce a fast plane I really want lighter gear installed if possible.
here is a motor at 25 grams that can be used on a 2 cell lipo, I dont think you will be able to fly this power system in your plane outside with any wind blowing. better for indoors use IMHO, but its lite

http://hobbyking.com/hobbyking/store...ner_Motor.html

and a 10 amp esc

http://hobbyking.com/hobbyking/store...ontroller.html

and a 500 mah, 2 cell, 20C lipo
http://hobbyking.com/hobbyking/store...Lipo_Pack.html

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Old 10-27-2013, 04:51 AM   #18
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the motor you first linked to will work, but use a turnigy esc and not the HK esc, from what i have read, the HK esc dont last very long, just my 2 cents worth.

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Old 10-27-2013, 11:47 AM   #19
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Hey Chellie thanks for your help again. I like your latest power set-up for my Hellcat, it seems to fit in with my light weight concept. I designed my plane to the same kind of specs as the Molt Models Hellcat, they had an IPS geared motor set-up originally.
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Old 10-30-2013, 04:19 AM   #20
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I purchased the the second power setup that Chellie suggested. Just have to wait now until it arrives in New Zealand. I will post pics soon.
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Old 10-30-2013, 04:47 AM   #21
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Originally Posted by nz builder View Post
I purchased the the second power setup that Chellie suggested. Just have to wait now until it arrives in New Zealand. I will post pics soon.
cool, please post a picture of your plane, it sounds like to me that its a balsa and tissue build being so light.

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Old 10-30-2013, 04:49 AM   #22
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Old 10-30-2013, 06:19 AM   #23
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Originally Posted by nz builder View Post
I looked at my scales at home and found a setting that converts the reading to grams and got 214 grams (with 3 servos included). This sounds a little more realistic. I know this is correct as I compared this measurement with other objects that had a stated weight on them (jars of peanut butter etc). Any power set up suggestions based on this weight? Sorry for the confusion, Im normally more onto it!!
For those readers that would like an inexpensive scale that can measure weights in this area, check out Harbor Freights stuff:
http://www.harborfreight.com/digital...ale-93543.html

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Old 10-30-2013, 08:32 AM   #24
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Good call Kyle
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Old 11-15-2013, 09:28 AM   #25
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I was wondering about prop size for the motor Chellie suggested (second setup) I want to get at least 200gms of thrust in order to get this plane airborne.
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