Funbat, Simple KFm2 Combat plane - Page 60 - RC Groups
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Jul 11, 2012, 05:23 PM
Registered User
mvaller00's Avatar
So quick question (if you don't mind).... it's a 1650kv motor, why so little thrust where other motors with less or similar kv put out more thrust? Just a bit confused?
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Jul 12, 2012, 01:06 AM
Reap the wild wind
headlessagain's Avatar
Size matters The larger the motor, the more wire in the windings and the more amps it can pull. Think in terms of a 50cc scooter engine and 600cc motorbike engine both spinning at 5000 rpm. Much more power output from the larger unit.
Jul 12, 2012, 02:09 PM
Registered User
chris1379's Avatar
Originally Posted by mvaller00
So quick question (if you don't mind).... it's a 1650kv motor, why so little thrust where other motors with less or similar kv put out more thrust? Just a bit confused?
I'll try to find a link later but the kv rating of a motor is rpm per volt with no load. When you load the motor with a prop a bigger motor will be able to turn it faster, drawing more power and delivering more thrust. The kv rating is good for comparing motors of the same size. If 2 motors are the same size and type with different kv ratings, the lower one will deliver more thrust while the higher one will give more speed. You can think of it like gears in a car to an extent. As a matter of fact, a gearbox can make different kv motors nearly equal but it's usually not practical for our small planes. Maybe this will help.
Jul 16, 2012, 06:22 PM
Corsir Crasher
Mopower71's Avatar
Can someone give me recommendations on motor,esc and props from headsuprc that will haul this around nicely? That are in stock, and not to expensive.

I did order stuff from another place, but it is shipping from Hong Kong, and I don't think it will be here in time for final assembly and a little practice before the combat at my club.

Heads up is in Fla, and ships same or next day.
Jul 16, 2012, 06:40 PM
Corsir Crasher
Mopower71's Avatar
How many oz of thrust is required?
Jul 17, 2012, 01:10 AM
Reap the wild wind
headlessagain's Avatar
How about these motors or for a bit more punch (and weight)
Jul 22, 2012, 04:40 AM
Registered User

where & how to mount batt + esc

Hi guys, Ive finished my funbat, I'm a bit unsure of the best place to mount the lipo & esc.
And the best way to mound the Lipo, velcro ??. I allways have issues getting vecro to stick to foam

The build was a bit rough, being my 1st DIY depron build.
Can the funbat be scaled up in size?(bigger) Does everything just scale up proportionally or would say length or tail need to be scaled up more ??

Jul 22, 2012, 09:28 AM
Reap the wild wind
headlessagain's Avatar
Hi 1101
I prime depron with UHU Por and let the glue get tacky prior to slapping on the velcro. I find velcro is all I need to hold up to 1550 3s packs in place. When I built my Maxi Bat I just scaled everything up but I find the regular version much nicer to fly. I'm planning on something in the 700-750mm wingspan size so I can fit a spare HK Funfighter motor and run her on 4s. Should be good for 90 mph
Jul 22, 2012, 11:09 AM
Retired CAD guy
birdofplay's Avatar
LowDePo both have INdustrial Strength Velcro - in Two Colors Black andf WHite

It's 2" wide and Sticks like crazy !

I think it was ~$8 for a meter of the stuff and I LIKE IT !

Cheapo Velcros from JoAnnes doesnt even come close to STICKING POWER !
Both on the back as well as the hook/loop side.
No extra or alternate glue necessary.

Northwest Cutout Service
Jul 27, 2012, 03:55 AM
Registered User
Hi guys, I just weighed my bat, almost 500g without battery.Obviously too heavy
Is that going to be unflyable ??

I left all the paper on the foam, 6mm art-shop foam sheet (all I can get really)
If I make another, how do I get the paper off the foam, can I use thinner foam?? should I use EPP for some parts (the tail)??

Last edited by 1101; Jul 27, 2012 at 06:17 AM.
Jul 27, 2012, 10:48 AM
Retired CAD guy
birdofplay's Avatar
Model Plane Foam -
Cut Kits -

Or soak the paper off with water or rubbing alchohol
Jul 29, 2012, 04:47 AM
Registered User
hello everyone, finally had a nice day where I got the chance to try a vertical take off. My tip for vertical take off is FULL THROTTLE INSTANTLY and everything else takes car of itself. Here is a video of the take off.

rc funbat vertical take off (0 min 31 sec)

Jul 30, 2012, 05:49 AM
Registered User
Someone should try building a pusher version just to see how would it fly
Jul 30, 2012, 09:39 AM
"Fly, yes... Land, No"
OutcastZeroOne's Avatar
I came up with a pusher bassed off of the Funbat

Wind Fighter

Flys very smooth and easily too.
Jul 30, 2012, 01:21 PM
Corsir Crasher
Mopower71's Avatar
My FunBat is getting closer to being finished.

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