ka8 electrified

Fans and Thermals.
mick a
Posts: 213
Joined: 20 Mar 2015, 22:00
Location: kent

ka8 electrified

Post by mick a » 13 Jul 2017, 09:00

hi
can anyone advise on best electric set-up
for 5 metre ka8 glider
ir weighs 9.5 kg
i havent a clue , so any help would be great thanks
mick

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Barry_Cole
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Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: ka8 electrified

Post by Barry_Cole » 13 Jul 2017, 09:07

Mick,
I depends a lot on what you want the motor to do...

If you just want power to get you back to the top of a slope, that is one option.
If you want it to take off from a dolly, then that is a different option.

Can you give us an idea of what you require.

BC

mick a
Posts: 213
Joined: 20 Mar 2015, 22:00
Location: kent

Re: ka8 electrified

Post by mick a » 13 Jul 2017, 10:25

hi Barry
thanks for the reply
i would like to take off from dolly
i dont want it to be ballistic , just something
for a nice steady climb
hope that helps ?

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terry white
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Joined: 18 Mar 2015, 21:08
Location: wareham,dorset.england

Re: ka8 electrified

Post by terry white » 13 Jul 2017, 10:55

Hi Mick i'm sure I can help you, been flying large scale E. power for a long time now, but I'm just off to Shropshire to fly in the Mynd fly-in get together (no E.power allowed on the Mynd though) I will post when I get back if you haven't heard from others. Regards Terry.

Jolly Roger
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Joined: 30 May 2015, 20:35
Location: Sutton Bank, North Yorkshire

Re: ka8 electrified

Post by Jolly Roger » 13 Jul 2017, 14:10

Hi Mick,

At 21lbs weight I'd want at least 1200W of power for ROG. You can get this from a 6s LiPo which is handy because any bigger and you need to pay lots more for your battery/ESC/charger.

A 6s battery gives you about 22V voltage (that's 6 cells at 3.7V per cell), meaning you need to draw a current of about 55A to get the 1200W power (because power = voltage x current).

To get a 55A current you need a motor with the correct kV and a prop to match. I suggest looking at the motor / prop combos used successfully by Chris Williams for models of comparable size/weight. He often details them on his excellent videos. It's got to be a good starting point.

Hope this helps. Sorry I have no 6s set-ups of my own to recommend. Good luck.

Rog

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chris williams
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Location: Blandford Dorset

Re: ka8 electrified

Post by chris williams » 13 Jul 2017, 14:12

Turnigy very helpfully name their range of motors to compare directly with glow motors. Thus the G60 is rated as similar to a .60 glow motor, and can very conveniently run on 2 x 3s's. My Super Javelot flies well on the 500Kv version, although there might not be enough power to get off a dolly.

Here's the full spec...

Turnigy G60 Brushless Outrunner 500kv
Turnigy Brushless ESC 85A w/ 5A SBEC
14/8 folding prop
2 x 3s Lipos


mick a
Posts: 213
Joined: 20 Mar 2015, 22:00
Location: kent

Re: ka8 electrified

Post by mick a » 14 Jul 2017, 07:34

thankyou very much gents
its really helpful , will have a look at the turnigy
as im a nitro dinosour so understand that bit
is it around 100 w per lb i need ?
or could i get away with 70w per lb
thanks again for all your help
mick

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Barry_Cole
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Location: Hampshire UK

Re: ka8 electrified

Post by Barry_Cole » 14 Jul 2017, 07:51

If you want to go off a dolly, go for the 100 W/Lb.

:D :D :D :D

BC

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RobbieB
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Re: ka8 electrified

Post by RobbieB » 14 Jul 2017, 08:57

Barry_Cole wrote:'If you want to go off a dolly..................'
So tempting...........

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Barry_Cole
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Location: Hampshire UK

Re: ka8 electrified

Post by Barry_Cole » 14 Jul 2017, 09:06

Down boy, stay calm......

:roll: :roll: :roll: :roll:

BC

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