Any interest in a "Jupiter Giant"? - Page 5 - RC Groups
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Aug 26, 2017, 10:24 AM
Laughs at un-boxing videos...
basicguy's Avatar
I have this Keda motor from Hobbyking. I think the weight is 660 g was $35

Don't have an airframe for it. Yet
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Aug 26, 2017, 10:32 AM
Laughs at un-boxing videos...
basicguy's Avatar
The only thing close I have is a J3 Cub with a 84x13" wing. Weight is 7.5 pounds all up with the cartoon 6" balloon tires.

It flies easily at half throttle with 405 gram 510kv 700 class helicopter motor on a 4s setup. Turns a 17" x8" prop at 50amps, 600 watts at full throttle. Max rated for this motor is 10s at 90 amps continuous.

A video showing it's performance
RC Cub (2 min 41 sec)


Have a 660gram Keda motor that has yet to find a home.
Aug 26, 2017, 01:26 PM
Registered User
Brave flying with that big Cub BG!

I wasn't expecting the ending though!

Way back in the day my Dad had a 1/3rd scale Cub

The first time I saw it I wondered why somebody was buzzing my Dad's property in a cub!

It had a small chainsaw motor with a pull start, but that big engine of yours might have worked!
Aug 26, 2017, 03:04 PM
Laughs at un-boxing videos...
basicguy's Avatar
You are going to have 2x the wing? and about half the wing loading?

The cub is fine. Did have too much fire in the hole on landing.

Took about all the down elevator that I had to keep it anywhere near level inverted.

I fly most of my planes about the same. Flying in circles sux.
Aug 26, 2017, 05:13 PM
Registered User
Yes, biplane with lots of wing/low wing loading.
The idea for this one is low and slow.

I'd like to get better at acrobatic flight, can do loops, rolls, lazy eights ok, but that's about it.

This plane is more of a goof - just for fun and to freak people out (and a good learning experience for me)
Aug 26, 2017, 07:12 PM
Laughs at un-boxing videos...
basicguy's Avatar
Hi
Wouldn't we all like to get better at flying. Going big scale seems simple at first glance. You know the complications that goes along with it.

I like to balance the plane with the batteries at CG and pick a motor that will balance it. Usually that involves having a bigger than recommended motor which many times actually makes for a more efficient running motor as most motors are most efficient at substantially less than maximum power output.
Aug 28, 2017, 07:54 AM
Registered User
380 kV motor, 100A ESC, 8000 mah battery, and 24 x 10 WWI XOAR Scimitar prop ordered!
Aug 28, 2017, 09:06 AM
Laughs at un-boxing videos...
basicguy's Avatar
What motor did you get?
Aug 28, 2017, 10:14 AM
Registered User
Quote:
Originally Posted by basicguy
What motor did you get?


PROPDRIVE v2 5060 380KV Brushless Outrunner Motor
Aug 28, 2017, 12:13 PM
Laughs at un-boxing videos...
basicguy's Avatar
About the same motor as in my cub.

The 24" prop. is pretty big for a 6mm shaft . You won't need much voltage though.

I usually fly the cub on 2 2400 4s batteries in parallel. Get about 5 minutes of flying before it hits 3.9v/cell
Last edited by basicguy; Aug 28, 2017 at 02:24 PM.
Aug 29, 2017, 08:16 AM
Registered User
Quote:
Originally Posted by basicguy
The 24" prop. is pretty big for a 6mm shaft .
You are right, so I won't be using the 6mm shaft.
I ordered a bolt on 8mm adapter made for this motor.
I also ordered a 10mm adapter for another motor that I am hoping to make fit.
The 24" prop has a 10mm hole.
Aug 29, 2017, 08:51 AM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by Scott in NH
You are right, so I won't be using the 6mm shaft.
I ordered a bolt on 8mm adapter made for this motor.
I also ordered a 10mm adapter for another motor that I am hoping to make fit.
The 24" prop has a 10mm hole.
Ummm, isn't that still using the 6mm shaft?

Ken
Latest blog entry: Ken's CAD Models new web site
Aug 29, 2017, 09:06 AM
Registered User
Quote:
Originally Posted by dz1sfb
Ummm, isn't that still using the 6mm shaft?

Ken
Hi Ken,

No, the motor gets turned around and it bolts to the "can" .

The 6mm shaft will go though a hole in the firewall and spin away without doing any work.
Aug 29, 2017, 10:56 AM
Retired CAD guy
birdofplay's Avatar
IT , being the Larger aluminum 3 lobe prop adapter.
The rear frame part where the Wires exit is what gets Bolted to the CROSS mount part and then to the Firewall.

It makes Prop shaft replacement so MUCH easier.
No Special "C" clip pliers and No Arbor Pressing of the bent shafting to remove it.

This hobby didn't used to have as many options.
But these days it seems that the larger hurdle is choosing from Too Many Options.

But It's nice to have all those choices. ;>}
Aug 29, 2017, 01:53 PM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by Scott in NH
Hi Ken,

No, the motor gets turned around and it bolts to the "can" .

The 6mm shaft will go though a hole in the firewall and spin away without doing any work.
I guess what I was hinting at is that everything is still turning on the 6mm shaft inside the bearings.

Ken
Latest blog entry: Ken's CAD Models new web site


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