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Feb 15, 2003, 12:41 PM
Single-task at best...
tim hooper's Avatar

Bubbles gets LRK brushless - Ohmigawd, yes!


This hobby just gets better and better, doesn't it?.

I've been flying Bubbles for the last 3 years now, and have always been delighted with its performance on an Astro 15G & 12 cells. (68 oz).

However, having witnessed the remarkable performance of the electric version of the Weston Cougar, I couldn't help but wonder how Bubbles would react to a similar set-up.

The first job was to build new larger ailerons, and a tailgroup to match with bigger elevators and rudder. Having flown the modified Bubbles, it was obvious that it would be worth shelling out the cash to upgrade the power system too.

I took the sensible option of simply copying the Cougars proven set-up; an LRK 350/15 outrunner, Hacker 70A ESC (with BEC), 8x3300 NiMH cells, all from WestonUK;

http://www.westonuk.co.uk/cougar.html

Today saw the first flights of the re-vitalised Bubbles, and the difference is stunning! Having shed 10oz, and gained a stack more umph, the model was airborne in a few feet & heading vertically upwards. After a couple of hundred feet, the momentum petered out (this was the battery's first discharge cycle), and the model just hung there for several seconds, before I cut the power. The model is vastly improved all round - far more agile; quicker rolls, tighter loops & bunts etc.

Duration is easily equal to the old set-up's 8-9 minutes, and the reduced weight has lessened the landing speed considerably too.

All I need to do now is get a few more cellpacks - don't you just hate waiting for NiMHs to charge?

tim
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Feb 15, 2003, 01:35 PM
Senior Member
Welcome to the family, Tim

Just wait to hear how it would do even better geared etc.


Petri
Feb 15, 2003, 05:59 PM
Sloping off....
leccyflyer's Avatar
Well done mate!

Looks like you've given Bubbles a wash as well

Bri
Feb 16, 2003, 07:20 AM
Registered User
hrvojekl's Avatar
Nice job Tim, but which prop you use? It's look pretty small for LRK 350/15??
H
Feb 16, 2003, 11:33 AM
Single-task at best...
tim hooper's Avatar
H,

The pic was taken before the LRK was installed. Caught me out there....

The LRK is turning an APC 12x6, and very nicely too!

tim
Feb 23, 2003, 04:26 PM
Registered User
R101's Avatar
I get good performance with the Bubbles (aka Skoosh) using an Axi 2820/10, 10 Cp1700, MA 11x9, although it probably doesn't have as much oomph as the LRK.
The great thing is the plan is FREE !!!
Feb 23, 2003, 05:50 PM
Single-task at best...
tim hooper's Avatar
Hi Lew!

I was prepping Bubbles for flight yesterday, when a clubmate, who had never seen the model before, asked, "Thats looks nice for an electric - will it take-off by itself, or does it need a handlaunch?"

The 15 feet run, followed by the vertical climbout answered his question!

tim
Feb 23, 2003, 06:12 PM
Sloping off....
leccyflyer's Avatar
Quote:
Originally posted by tim hooper
The 15 feet run, followed by the vertical climbout answered his question!

tim
Funny, that sounds just like one of your handlaunches

Bri
Feb 25, 2003, 04:28 PM
Registered User
Fredrik W's Avatar

Re: Bubbles gets LRK brushless - Ohmigawd, yes!


Quote:
Originally posted by tim hooper
an LRK 350/15 outrunner, Hacker 70A ESC (with BEC), 8x3300 NiMH cells, all from WestonUK;
Tim, how many turns does your motor have? The West UK link doesn´t say.

// Fredrik Wergeland
Sweden
www.flyingmodels.org
The Great Electric Motor Test
Feb 25, 2003, 06:50 PM
Single-task at best...
tim hooper's Avatar
Fredrik,

I'm embarrassed to admit it, but I haven't got the foggiest idea! It works in the Cougar so I just copied it....

tim (going to stand in the corner...)
Feb 26, 2003, 08:21 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Fredrik & Tim (ok, you can come out now ), you'll find the figures here:
http://www.flyware.de/dshop/docs/pd-1566393124.htm

Groeten Ron
Last edited by Ron van Sommeren; Feb 26, 2003 at 08:27 AM.
Feb 26, 2003, 03:52 PM
Registered User
Fredrik W's Avatar
Thanks Ron!

Next question: Is it a 10 pole or 14 pole motor...

// Fredrik Wergeland
Sweden
www.flyingmodels.org
The Great Electric Motor Test
Feb 27, 2003, 05:51 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Quote:
Originally posted by Fredrik W
Next question: Is it a 10 pole or 14 pole motor...
Tim can count the number of magnets.
Last edited by Ron van Sommeren; Feb 27, 2003 at 06:01 AM.
Feb 27, 2003, 08:57 AM
Mr Mootsie
Mr Mootsie's Avatar
Quote:
Originally posted by tim hooper
Fredrik,

I'm embarrassed to admit it, but I haven't got the foggiest idea! It works in the Cougar so I just copied it....

tim (going to stand in the corner...)
ah, yes, another person who doesn't know the technical stuff! I feel better now.
Nov 01, 2004, 10:44 AM
Registered User

lrk350


did you use the prop mount supplied by weston or the spindle coming out of the back. I have a couger set up and am building my first bubbles and am not to sure whether to stick the outrunner bit out in front as the cougar or have it spinning inside the front end


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