Search found 34 matches

by socalfusions
May 14 2012 5:10pm
Forum: E-Bike Non-hub Motor Drives
Topic: Lightest Gearbox for Turnigy 80-100-B?
Replies: 6
Views: 2687

Re: Lightest Gearbox for Turnigy 80-100-B?

E-racer wrote:the thought of an 80-100 powered ornithopter is frightening but i love it! good luck with your build!
Gratitude good sir 8)
by socalfusions
May 13 2012 9:02pm
Forum: E-Bike Non-hub Motor Drives
Topic: Lightest Gearbox for Turnigy 80-100-B?
Replies: 6
Views: 2687

Re: Lightest Gearbox for Turnigy 80-100-B?

you need to knock a 0 off that weight (well, almost). a single stage ple80 is about 2kg, or about 4lb. extra stages add about 400g. There isnt going to be anything much lighter than that that will handle the 80100's torque. at 25:1 even the ple80 isnt enough, as a 80100 has a peak torque of ~10nm, ...
by socalfusions
May 13 2012 7:55pm
Forum: E-Vehicles General Discussion
Topic: Anyone use Gates Carbon Belt Drive?
Replies: 2
Views: 1514

Re: Anyone use Gates Carbon Belt Drive?

Miles wrote:The forum's search isn't completely useless......... :wink:

http://www.endless-sphere.com/forums/se ... mit=Search
Touche, thanks!
by socalfusions
May 13 2012 4:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: Lightest Gearbox for Turnigy 80-100-B?
Replies: 6
Views: 2687

Re: Lightest Gearbox for Turnigy 80-100-B?

What is the lightest 25:1 gearbox, or variable ratio gearboxe, that is a good choice with the Turnigy 80-100-B? is there a reason you're looking for 25:1? Because if you're trying to do all you're reduction in 1 stage you need to be aware that a box to handle a 80100 will be at least 100mm long... ...
by socalfusions
May 12 2012 11:26pm
Forum: E-Vehicles General Discussion
Topic: Anyone use Gates Carbon Belt Drive?
Replies: 2
Views: 1514

Anyone use Gates Carbon Belt Drive?

This carbon belt seems superior to conventional belts or chains. It's much stronger, requires no lubrication, very durable towards the elements and is noiseless. Has anyone ever incorporated one of these into one of their ebike projects?

by socalfusions
May 12 2012 10:38pm
Forum: E-Bike Non-hub Motor Drives
Topic: Lightest Gearbox for Turnigy 80-100-B?
Replies: 6
Views: 2687

Lightest Gearbox for Turnigy 80-100-B?

What is the lightest 25:1 gearbox, or variable ratio gearboxe, that is a good choice with the Turnigy 80-100-B?
by socalfusions
May 08 2012 7:56pm
Forum: E-Bike General Discussion
Topic: Belt to chain single primary reduction stage?
Replies: 3
Views: 1087

Belt to chain single primary reduction stage?

Can anyone explain what kind of applications would use or benefit from this type of reduction system? What is the reasoning to go from a belt to a chain and what benefits does it entail?
by socalfusions
May 07 2012 8:23pm
Forum: Motor Technology
Topic: Predator 50/6 Vs. Predator 37?
Replies: 5
Views: 1668

Re: Predator 50/6 Vs. Predator 37?

is it for sale now? more specific datas ? (thrust , rpm ..) The link I posted was the only existing page that had any info on the Predator 50/6 and it was very limited. I just got a response from a Plettenberg employee and they said it is for sale but that they do not have any data online, likely b...
by socalfusions
May 03 2012 5:41pm
Forum: Motor Technology
Topic: Predator 50/6 Vs. Predator 37?
Replies: 5
Views: 1668

Re: Predator 50/6 Vs. Predator 37?

Someone must have knowledge on these motors!
by socalfusions
May 01 2012 8:32pm
Forum: Motor Technology
Topic: Predator 50/6 Vs. Predator 37?
Replies: 5
Views: 1668

Predator 50/6 Vs. Predator 37?

After being impressed by the power of the Predator 37 http://www.plettenberg-motoren.com/UK/Motoren/aussen/Predator37/Motor.htm , I came across the Predator 50/6 http://web.mac.com/goransson/Watts_up/Blogg/Poster/2011/6/13_PREDATOR_50_6.html . Is this a large upgrade from the Predator 37 and do any ...
by socalfusions
Apr 30 2012 10:58pm
Forum: Motor Technology
Topic: 15-20kw Brushless Motor Differences?
Replies: 2
Views: 868

15-20kw Brushless Motor Differences?

What are the features that really set apart the brushless motors in the 15-20kw range such as the Hacker A200, Predator 37, Joby Motors, etc. Is it the Kv that makes a large difference? The Predator has a unique design that allows better cooling from spaces in the center of it, other than that I don...
by socalfusions
Mar 05 2012 9:30pm
Forum: Motor Technology
Topic: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?
Replies: 15
Views: 3207

Re: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?

Wow that video is amazing if true, I'll be following its progress. The actual power requirements for a flapping-winged aircraft are obviously difficult to work out because it depends on the efficiency of the craft (i.e. "sink rate"). But a way to take a simple view is to look at the efficiency of e...
by socalfusions
Mar 05 2012 7:49pm
Forum: Motor Technology
Topic: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?
Replies: 15
Views: 3207

Re: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?

Moving an aircraft requires a different amount of power than moving a bike, so I imagine that's why those values are different. I was interested a few years ago in electric, human-sized ornithopters. I did some rough calculations on minimum power requirements if you want me to dig them up. Pretty s...
by socalfusions
Mar 03 2012 9:28pm
Forum: Motor Technology
Topic: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?
Replies: 15
Views: 3207

Re: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?

Outrunners have the advantage of a larger airgap radius for a given overall diameter. This is because a PM rotor take up less space than the stator. For a comparison of inrunners vs outrunners see: http://endless-sphere.com/forums/viewtopic.php?p=302385#p302385 Direct drive hub motors are outrunner...
by socalfusions
Mar 02 2012 9:34pm
Forum: Motor Technology
Topic: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?
Replies: 15
Views: 3207

Re: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?

however it also appears that inrunners are more capable of moving more weight and are better suited for high torque, low rpm scenarios. please link to your source for that information. it is in total contradiction to everything Ive learned. It appears I was mistaken, I thought inrunners were made f...
by socalfusions
Mar 02 2012 2:30pm
Forum: Motor Technology
Topic: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?
Replies: 15
Views: 3207

Re: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?

Miles wrote:Why not start by stating what your needs are?

Leaving aside the myths regarding the merits of inrunners vs outrunners... I thought the BMC motor was an outrunner, too? :)
I was theorycrafting if it would power a very large ornithopter hence the 25:1 gearbox :mrgreen:
by socalfusions
Mar 01 2012 11:06pm
Forum: Motor Technology
Topic: 8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?
Replies: 15
Views: 3207

8600w Outrunner vs 2000w Inrunner w/ 25:1 Gearbox?

http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=14427 Vs. http://www.thesuperkids.com/20wabmcbrpoe.html If using these motors with a 25:1 planetary gearbox which would be a better choice? From what I've read brushless outrunner motors can achieve similar tasks because the motor doesn...
by socalfusions
Feb 24 2012 5:55pm
Forum: Motor Technology
Topic: UTIAS Ornithopter with Brushless Motors?
Replies: 5
Views: 2063

Re: UTIAS Ornithopter with Brushless Motors?

Of course there is brushless motors who can. Just look at a neighbor thread: http://endless-sphere.com/forums/viewtopic.php?f=30&t=24617 It's a matter of power-to-weight ratio. Batteries are heavy compared to liquid fuel. But if you look at the whole vehicle, the difference doesn't necessary have t...
by socalfusions
Feb 23 2012 8:48pm
Forum: Motor Technology
Topic: UTIAS Ornithopter with Brushless Motors?
Replies: 5
Views: 2063

Re: UTIAS Ornithopter with Brushless Motors?

Someone must know if brushless motors can produce an equal amount of force as this jet turbine engine (only 18k watts)!
by socalfusions
Feb 20 2012 11:05pm
Forum: Motor Technology
Topic: UTIAS Ornithopter with Brushless Motors?
Replies: 5
Views: 2063

Re: UTIAS Ornithopter with brushless motors?

wow. I was under the impression no one ever made a full-scale ornithopter that successfully flew. Does this qualify as a flight ? I think when the first human-powered flight was achieved there were min-height requirements, and a turn requirement to be "official". Does anyone know if an ornithopter ...
by socalfusions
Feb 19 2012 11:40pm
Forum: Motor Technology
Topic: UTIAS Ornithopter with Brushless Motors?
Replies: 5
Views: 2063

UTIAS Ornithopter with brushless motors?

UTIAS Ornithopter
http://en.wikipedia.org/wiki/UTIAS_Ornithopter_No.1




This prototype ornithopter used a 18kw jet turbine engine to achieve enough thrust to fly, is it possible that 18kw supplied by brushless outrunner motors would supply an equal amount of power?