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May 02, 2007, 03:47 PM
Lance Armstrong- 7 times!
flybike's Avatar
'reduce cell count to spin a bigger prop'

That's what I tried with Pink Floyd and my Hacker C50. Yes, it worked, but you have to raise the amps by a lot. With heat generated being a function of amps squared, this really limits max motor power. So, it's either a reduction drive (like they use in the above link) or a super high torque (low kv) motor.
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May 02, 2007, 03:51 PM
iumop ap!sdn w,I
G.P.'s Avatar
I'm sure that you could get some sponsors for this. Who wouldn't want to be able to claim that their batteries and/or motor powered a 50ft rc plane?!?!?! As long as you gave them the rights to the video and pictures someone would go for it.
May 02, 2007, 07:29 PM
Registered User
Your original power system seemed fine, just needed a bit of a mod which I believe was being done. The main issue at the moment is to find a Lipo supplier who has sufficient confidence in their product to sponser you.

Ron...
May 02, 2007, 07:40 PM
Lance Armstrong- 7 times!
flybike's Avatar
You're probably right. I'll take a look at the gearbox when I get it (next week?) and see what needs to be done.

hans
May 02, 2007, 08:27 PM
iumop ap!sdn w,I
G.P.'s Avatar
Just start sending out the photo from this post to all of the major lipo dealers; it sure would make one heck of an ad. I know that if I was flipping through a magazine the Big Floyd would catch my eye!
May 02, 2007, 10:06 PM
What...me worry?
bluswede's Avatar
Hans,
That was a 60 X 36 prop as I recall.
As for the drive...the main need, in my "built a couple interesting things around the house" opinion, was a wider belt and pullies, prob'ly also a little more belt wrap on the one motor pulley. Motors, reduction ratio, prop RPM/thrust, and such seemed fine. The batteries seemed to deliver well also.
The maiden attempt was a "while ago" when it comes to battery pack development...did they even have balance plugs on them?
Regards,
Scott
May 02, 2007, 11:06 PM
Lance Armstrong- 7 times!
flybike's Avatar
Yes, they have balance plugs on them. I didn't have a balancer for the first ~8 months I had them, but they also didn't get more than about 3 cycles in that time. Now I use an Astro balancer every time I charge them. (which still isn't very often)

hans
May 03, 2007, 07:57 AM
Registered User
What happens to the pink foam over time? Will it become more brittle and prone to failure?
May 03, 2007, 08:29 PM
ok, maybe it is a toy
rob mueller's Avatar
Quote:
Originally Posted by RonD
What happens to the pink foam over time? Will it become more brittle and prone to failure?
The insulating properties remain so long as it remains out of direct/indirect UV light.
May 04, 2007, 10:40 PM
Promoting Model Aviation...
Murocflyer's Avatar
Quote:
Originally Posted by jrbackus
Every time this thread is bumped to the top of the list, another person is suckered into not only reading 100+ pages but also sentenced to months (or years) of waiting to see if big floyd will ever really fly. It's like a cult...
Gotta admit though, it makes for interesting reading. I don't think there is one person here on RCGroups that hasn't read a few pages or so.

Frank
May 05, 2007, 03:11 AM
Registered User
Quote:
Originally Posted by flybike
Ahh.. I didn't realize that Tram = CommonSenseRC until now! I just sent some customers your way two weeks ago.

The batteries we initially tried were TP 5300 prolite 5s. We had 6 packs, two in series for each motor. I'm not sure if the cells inside the packs are 3p (1325 cells) or 4p (1760 cells).
I guess space is not an issue so, unless weight is one, maybe someone could donate 108 A123 cells for 3 12S3P packs. At least they don't die just by laying around waiting like Lipos do....

Fred
May 05, 2007, 12:03 PM
Registered User
kushal_22's Avatar
Quote:
Originally Posted by flarssen
I guess space is not an issue so, unless weight is one, maybe someone could donate 108 A123 cells for 3 12S3P packs. At least they don't die just by laying around waiting like Lipos do....

Fred
What?? Lipos dying? You meanto tell me they don`t last "Forever"

Mal
Jun 01, 2007, 12:33 PM
Registered User
I don't know where you can get these motors in the US, but this might be suitable. It is one of the cheap chinese motors. Produces 6600Watts! Thats nearly 9 horse power!

The website : http://www.brchobbies.co.uk/?page=sh...ditem&item=542
Jun 01, 2007, 12:43 PM
Suspended Account
Cheap Chinese or not 6600Watts is amazing.
Jun 01, 2007, 01:16 PM
Registered User
JWilliams2's Avatar
Quote:
Originally Posted by fly4fun
Cheap Chinese or not 6600Watts is amazing.
Yep there are a couple of links in this thread now for massive, very inexpensive motors and I think they'd be far more suitable than the home built power train that was part of the original attempt.


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