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4hv.org :: Forums :: Projects
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Large Quadrotor FPV.

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Move Thread LAN_403
Chris Cristini
Wed Nov 21 2012, 04:04PM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
 		Oh dang I guess I am going to have no Choice but to spend $100 Plus on LiPo. I will get a Prius Battery haha.
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Sparrow338
Wed Nov 21 2012, 05:24PM
Sparrow338 Registered Member #661 Joined: Sat Apr 21 2007, 03:17AM
Location: Ventura, CA
Posts: 41
 		For cheap lipos try hobbypartz.com. I have a few of their "sky" series lipo's (3s1p) that I use in a 450 size heli and have had great performance with them. Their "eco" series (I believe is their cheapest series) have also given me great results running in a large RC tank.

Anyways, thought that might help.

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Chris Cristini
Wed Nov 21 2012, 09:50PM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
 		OK Four 18x6 Props and Matching electric start 2 strokes can get 21 LBS of thrust a piece 84 Lbs of lift sounds better any way and much easier to construct with out all this expensive battery crap. Also I want long flight time more than 4 mins haha
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Patrick
Wed Nov 21 2012, 10:23PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		yes for heavy lift youd be better off with piston power of one sort or another.


you also have to remember that above some whieght (under AMA rules here in the US) you wont be able to fly over peoples houses and heads, your effectivly building a cruise missle too, should anything go wrong.
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Chris Cristini
Wed Nov 21 2012, 11:33PM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
 		Maybe lower the scale I really wanted electric but the technology is just to Horrible.
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Chris Cristini
Wed Nov 21 2012, 11:38PM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
 		Maybe a twin Copter setup Twin engine and the Tail prop will be electric? Sorry for double Posting I forgot this time. Maybe something like These Link2
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Ash Small
Thu Nov 22 2012, 12:07AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Chris Cristini wrote ...

Maybe a twin Copter setup Twin engine and the Tail prop will be electric? Sorry for double Posting I forgot this time. Maybe something like These Link2

You won't get far with those. I think the technical term is 'knackered'.

(Unless you rebore, replace pistons, rings, etc, maybe big ends, but they probably aren't replaceable anyway)

New ones aren't that expensive, but the ones you linked to are only good for paper weights....they have very low compression...about 4:1)
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Chris Cristini
Thu Nov 22 2012, 12:30AM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
 		Haha OK This would be Good? Link2
For some reason I don't like Glow engines.
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Pinky's Brain
Thu Nov 22 2012, 12:46AM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
 		Without a variable pitch system you won't be able to control power quickly enough ... even with a variable pitch system the standard quadcopter control systems won't work out of the box.
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Chris Cristini
Thu Nov 22 2012, 05:47AM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
Steve Conner wrote ...

No, laptop pack cells aren't designed for rapid discharge, you'll just destroy them.

To answer your original question, the thrust figure should be equivalent to lift.
Thanks Steve for answering my Thrust question. I guess it is back to the drawing board.
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