22nd - 24th July European Championships 2005

[tunna]

We will be testing the new machine from the Bulldog stable,should turn a few heads,
Nothing exceeds like excess!

Well my heads just been turned with a statement like that (hope it justifies it !!!)

Look forward to seeing it. Nobody seems to do excess or extreme any more.

Roger.

P.S. Hoping to have my Feather running for this event - Its a bit extreme itself.

[tunna]

Bulldogs new weapon is in my profile total weight
including teeth 18kgs,made from T6, with D2 tool steel teeth, 1500 rpm,

Der Boyz

Nice Tony.€¦ Very nice indeed.€¦ Any chance you could publish the dimensions of the disc so I can do a KE calculation!! :wink:

Hello Geoff
I have already done a calc before I made it but it will be interesting to get someone elses calc
Here goes,Dia across disc 500mm,Dia across teeth when in position 600mm, Disc 27mm thick,teeth 25mm thick,geared to 1500 (dependant on testing)
starting and stopping has to be considered!
Lem 130 prime mover Shaft dia 38mm,

tony

Tony,
My calcs suggest it would give 6.5kj @ 1500RPM. Spin up time should be less than a second with a lem130. Max tip speed is about 100mph.

Looks great! Cant wait to see it in action.

Mark

I agree the KE calculation (I came out at 6.47Kj) But The only way you could produce a spin-up time even close to what Mark states is by having to run the LEM at 36V at a reduction ratio around 4:1, NO slip whatsoever in the drive and a very effecient set of battries. Even then I think 1 second is being a little hopeful. Pratical experience (plus a bit of fancy maths) sugests a spin-up time some were between 1.7 and 2.3 seconds (still more than acceptable!)
Looking forward to seeing that run in anger Tony!

Thanks for that guys I got around 7kjs I was out a little then,! dissregarding efficiency, spin up time depending
on what type of transmission/ setup I use, we estimated 2.0 secs,from still, recovery after a heavy impact
around 1.2-1.5 secs, battery performance all important, but more important to me is that
with this disc flying round, drivability!!!!!
it has to perform and deliver the weapon, I dont expect bots to be queuing up to run into the front,

Tony, as far as drivability goes, depends if you are going to run it horizontal or vertical!
Horizontal shouldnt cause you a problem, but that mass running vertical will be nightmare when it comes to doing a tight turn...just watch our featherweight and you will see what I mean!

Horizontal definately!!!!
Gyroscopic probs if we go vertcal,also greater
strike area horizontal,also can invert if flipped,but check out this Im seriously
thinking of spending some of my own money on this machine!!!!!!!!!:sad::sad::sad:,