Kerr205
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| posted on 22/3/15 at 09:41 PM |
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What is the lightest "7"
I've started to get a bit obsessed with this......I've read that Richard Meaden of Evo magazine fame built his own blade engined 7 and got
it down to 370ish kg and it got my thinking. What is the lightest kit and what is the lightest bike engine? Is 370kg the utter minimum that can be
achieved? Is this easy enough to achieve, I'm guessing not.
Just thinking whilst I'm idle!
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daniel mason
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| posted on 22/3/15 at 10:04 PM |
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Think the early blade motors In the caterhams were very very light as a package!
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Kerr205
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| posted on 22/3/15 at 10:13 PM |
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I'm positive it was a Caterham and a blade that Meaden built.
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Jon Ison
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| posted on 22/3/15 at 10:16 PM |
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mines 440 with a bit of fuel, to get to 370 I would have to ditch the chassis and some..............
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loggyboy
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| posted on 22/3/15 at 10:23 PM |
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Westfield had the fw400.
400kg carbon tubbed with a k series.
not much point in getting much lighter unless you want it to handle like a matchbox car on a hard floor.
Mistral Motorsport
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INDY BIRD
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| posted on 22/3/15 at 10:34 PM |
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Video picking up a Caterham
https://www.youtube.com/watch?v=yAjl4TZdz_o
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theduck
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| posted on 22/3/15 at 10:35 PM |
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Even the light car company rocket was 380kg
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daniel mason
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| posted on 22/3/15 at 11:47 PM |
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The lighter the better! But the stripped out bike powered west fields at the top of the sprint tree are all just over 400kg! Around 405kg usually
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ali f27
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| posted on 23/3/15 at 12:06 AM |
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all about power to weight and yes you can build a car at 370 kg
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daniel mason
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| posted on 23/3/15 at 12:13 AM |
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It would be tough! My force was 307 kg with no battery and tha carbon chassis only weighs a few kgs
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Ugg10
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| posted on 23/3/15 at 07:38 AM |
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There were a couple of guys built r1 fury's fir the track only with lightweight chassis and paper thin bidies, those were reputed to be less
than 450kg. A while back sculptural engineering (built the elisealike larini which became the gtm ballista) were building a composite sandwich
structure seven chassis (think quantum extreme stainless chassis but in a carbon/fibreglass and structural foam sandwich). Don't think it saw
the light of day though, similar chassis have been used in formula student.
---------------------------------------------------------------
1968 Ford Anglia 105e, 1.7 Zetec SE, Mk2 Escort Workd Cup front end, 5 link rear
Build Blog - http://Anglia1968.weebly.com
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simonrh
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| posted on 23/3/15 at 09:05 AM |
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quote:
Originally posted by Ugg10
There were a couple of guys built r1 fury's fir the track only with lightweight chassis and paper thin bidies, those were reputed to be less
than 450kg. A while back sculptural engineering (built the elisealike larini which became the gtm ballista) were building a composite sandwich
structure seven chassis (think quantum extreme stainless chassis but in a carbon/fibreglass and structural foam sandwich). Don't think it saw
the light of day though, similar chassis have been used in formula student.
Think this project is for sale on ebay at the moment?
http://www.ebay.co.uk/itm/BALLISTA-RACE-KIT-CAR-BODY-AND-MOULDS-/290956700477?pt=LH_DefaultDomain_3&hash=item43be5eeb3d
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Ugg10
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| posted on 23/3/15 at 09:31 AM |
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Interesting, my only worry would be that you may have the moulds but do you have the rights to make and supply the cars (trade marks, copyrights,
intellectual property etc.).
I almost bought one of the first kits before opting for a fury. It has a similar design to the gtm libra. Composite sandwich monocoque with metal
frames front and back for the running gear. It was originally mk2 golf based iirc., vr6 anyone? The original designers, sculptural engineering, were
racing yacht builder I think and so that is where the grp foam sandwich structure comes from. The original demo car was very well put together, it
started out yellow, then was turquoise and I think it is now black and sold recently on ebay.
http://www.gtmdrivers.com/forum/ballista-body-moulds-for-sales-t2680.html
Back on topic - original advert for the SE Monocoque seven - stillborn afaik but great idea, would lover the time, knowledge and funding to develop
this idea.
[Edited on 23/3/15 by Ugg10]
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1968 Ford Anglia 105e, 1.7 Zetec SE, Mk2 Escort Workd Cup front end, 5 link rear
Build Blog - http://Anglia1968.weebly.com
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coozer
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| posted on 23/3/15 at 10:21 AM |
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Pretty sure that MNR had a race car built out of t45 that was 380kg?
1972 V8 Jago
1980 Z750
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MK9R
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| posted on 23/3/15 at 11:14 AM |
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Ypu can make it as light as you want, but the question should be "what is the lightest structural sound 7 built"
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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Jon Ison
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| posted on 23/3/15 at 12:44 PM |
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Just to clarify my post above, in no way was it intended to read that it cant be done, just that no way it could be done with mine.
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jossey
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| posted on 23/3/15 at 06:01 PM |
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mine was 410 kg with a bar but no cage, no fuel and only 1 seat.
Thanks
David Johnson
Building my tiger avon slowly but surely.
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Sam_68
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| posted on 23/3/15 at 08:16 PM |
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quote:
Originally posted by daniel mason
It would be tough! My force was 307 kg with no battery and the carbon chassis only weighs a few kgs
...although that's almost exactly 100 kilos more (nigh on half as much again!) than the claimed weight of the lightest hillclimb single-seater I
know of. 
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gixermark
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| posted on 25/3/15 at 04:00 PM |
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i had a road legal blade striker that was ~530-40 Kg, with full cage...
it had capri alloys.. and normal road bodywork, nothing fancy.. you could build one to 400Kg with thought and a few quid.
you could build a 36-380Kg 7, but for sure you would need to be creative... and spend a few quid
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Kerr205
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| posted on 25/3/15 at 10:05 PM |
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Whoah, thanks for all the replies, I'm intrigued but this weight gain game.
K.
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Chet
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| posted on 28/3/15 at 01:52 AM |
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FYI-
My Hayabusa powered J15 weighs a confirmed 441 Kg on the road.
A well built R1 powered Riot should weigh considerably less.
It's amazing how strong and light a Jeremy Phillips designed car is.
Chet
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Riot Squad
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| posted on 1/4/15 at 05:20 PM |
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A bike engine Riot shouldn't have any problems getting under 400 Kg for sensible money. If you want to spend lots of money on Lipo batteries,
carbon fibre panels and body work there's certainly more weight to be saved.
A slight problem we have run into as the Riot is so light, is that for many race series we have to add a lot of weight to reach the minimums for regs!
www.Riotcars.co.uk
Tel. 01643 709330
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perksy
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| posted on 1/4/15 at 07:23 PM |
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Barneys blade engined Westfield was the lightest Westfield in the country iirc and was campaigned in the westfield speed series.
The attention to detail was superb and he had saved weight from every area of the car.
No problems with the handling and it certainly wasn't slow 
I'll have a dig and try and find out what it weighted, but iirc it wasn't alot over 300kgs
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Riot Squad
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| posted on 1/4/15 at 08:40 PM |
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A mid / rear engine car should always be lighter in theory than a front engine rear drive car due to the lack of propshaft, diff housing and
associated mounting hardware.
www.Riotcars.co.uk
Tel. 01643 709330
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The Huff
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| posted on 2/4/15 at 08:39 PM |
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My Fisher Fury with an R1 5PW lump weighed-in fully fuelled at 422Kg at SVA, 427 at last corner-weighting - has grown a Petty strut to the roll bar,
decent extinguisher etc.
Rather than worry about the car, I worked on me - upped the cycling & daily attitude etc to counter my increasingly desk-bound day job; and in
8months shed a bit over 18kg; target - 500kg for the car with me in it. 3yrs later I strive to keep it that way (I've currently got ~4kg to bin,
post-winter). Not all performance is about hp/tonne, 0-whatever - or requires buying more carbon! 
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