Featherweight Database

If you cant beat them join them. But we have a flipper coming too just started to built it today check my profile
Tony

Just make a good brick thats what I say

status of KENNY pic on profile

speedos,batteries,ram,valve etc :D

thanks
kenny

I think weve got a LP featherweight gravity :)

Bah! get a propar size ram, 63mm bore, 320Kg of force!

lol :) I think a RIP vs G3 vs KENNY grudge match is coming soon

dont need 63mm bore ram get better results with 50mm bore with big buffer and massive valve

thanks
kenny

:)

Ewan a featherweight gravity? Nah

TO do featherweight gravity on low pressure you would want something like 100mm bore ram powered on 16bar by a 1inch bore valve with huge buffertank.

Regards
Ian

May not be quite as throwy but it sure looks the part (but still, 210kg of force at the ram isnt bad when throwing 12kg...)

but can he lift a heavyweight?

Ignore stats and figures. Its not just how powerful the flipper is, its how good the rest of the robot is and so on.

Mr Stu

Bah, they are all still just simple pneumatic flippers, my team mate is having a go at a new style of flipper, something none of you guys have played with yet :proud:

spinning disc holding energy then transfering it into a flipping arm?

Oh im so sorry that us british are not up to your assuie standards yet. LOL!

Mr Stu

featherweight gravity?.....

Oh well...
I suppose I better put it up on here for her!

Name..PILLOW TORQUE
Driver..Jenny Smith
Weight..12Kg
Type..4WD Pushbot
Drive..2 X 750W Astroflight motors with Team Whyachi gearboxes.
Top speed..12MPH
Power..24V 3.3Ah Ni-MH
Controler..IBC (With additional fan cooling)
Armour..2.5mm grade 5 titainium

Can it push??...Ask Stu! :wink:

me featherweight gravity thats james bakers bot :D

thanks
kenny

titanium Geoff, not titainium :)

Whats the odd i between friends? ...
Goes off and writes out 100 times I must learn how to spell! :sad:

.......and friends have to be pretty close to stop the i rolling onto the floor

....strange AND macabre :wink:

quote: Alan young

but can he lift a heavyweight?

you have seen today at newcastle that it did and we just nearly flipped behomoth

but you needed G3s help :P

nah you will see if you recorded it i could lift it up :)

btw i had the lift it up and keep it up for g3 to get under then i let it go so g3 got squashed :)

thanks
kenny

Ive updated my profile with a completed all-new microCHIP. The blades are 1.2Kg in total but spin at 6000rpm. The v belt has still to be fitted.
Rob

Hi Rob,

How come you have a 1:1 reduction with huge belt pullys....why not make smaller ones and loose alot of weight? would be the same gear ratio just smaller and lighter.

but it wouldnt look as cool

also more likely to slip if smaller.

also more weight on the disc side means more Knetic Energy.

Mr Stu

Spose it does look better with big pullys :)

Big pulleys stand up to more punishment from Eds whirly bit as he put it.

Ive messed about with diddy pulley on feathers (eg BlacknBlue)and watched other feathers for ages and I decided to go for BIG ONES!! They only weigh 400g each and take a beefy 13mm v belt. It never comes off or slips due to the huge surface area of contact. With the blades needing to be bolted on I needed something substantial in order to take the punishment (An EV Warrior @ 36v). Its worth remembering that the pulley itself adds to the MoI (Possibly both pulleys do?)
The mounting is aluminium and the inner shaft is 20mm titanium. Sadly it all weighs 12.7 Kg so I may have to run it with just one 500g blade not two, unless I can make savings elswere.

How about using 8v batteries.
Im sure others would agree! :proud:

Mr Stu

Rob, That is one nice looking bit of kit.:)
Having played with many types of belt / pully arangements for weapons drive, the one thing we have learned is that it is always handy to have a little slipage in your drive train. Think on this.. You manage to bring that EV to a dead stall @ 36V any idea what the stall current is? ...Trust me, its a SERIOUS number of amps!!
Its more than possable to weld relay contacts shut (with all the embarassement that causes when you discover that you cant turn your weapon off!!)
Not to mention the excess loading on your battries, increasing the very real chance of some high quality pyrotecnics!:sad:
Yes, you will gain a little MoI from the bigger pullies, but it is only a little. For what its worth I would set that up with just enough slack in the belt that if you were to lock the blades, the EV is JUST capable of slipping the belt.
A far as reducing the 0.7Kg are you using Ni-CAD or Ni-MH batts.? Remember 36V of Ni-Cad weighs around 2.8 - 3Kg but 36V of Ni-MH will come out somewhere around 2.1Kg.
Oh yes, just one other thing..Just how thick are those polycarb body panels? :wink:

Regards,
Geoff.

Thicker than your polycarb pannels, so go back to your Astro flight!

Mr Stu

LOL!
The panels are 6mm polycarb. But Im hoping that nasty spinners will be kept away by simple side bars like in big CHIP. Ill need lots of spares!
Im going to be testing the weapon once Ive have hardened the blades. If things get difficult I can run it on 24v, or use a small solenoid, or do what we do with our other spinner BlacknBlue - namely cut the motor just before every hit.
The power at the moment is 3 x 2100mAh, 12v NiCAD in series. I have loads of other types to try out. 2100mAh may not be enough for a battle.
It may well be that the 2WD design with the blades well away from the robots centre of turning mean that the weapon wont stall anyway-glancing cuts and tears only, especially at 6000rpm.

Looks good Rob. Cheers Geoff got the green belt. DragonStrike Nearly done just got the electrics to do. Running my EV on 24v. Latest pic on profile. Tiamat coming on nicley latest pics on web site.
Regards Tony.

Thanks Tony
DragonStrike looks a very strong robot! Is that steel all over?

No its not steel its 6mm Ali with 10mm poly bulkheads the bar is 2kg and 30cm long 6cm wide and 2cm thick steel. Power 2x 3300 NI-MH. Drive 14.4v Drill motors.
Tony.

Lookin good so far Tony :)