SlotForum banner

1 - 17 of 17 Posts

·
Registered
Joined
·
312 Posts
Discussion Starter · #1 ·
Finally finished is the rolling testbed AKA FW08b. This was an exersize in making a true 4WD rear end. The body is a Scaley FW07 and the chassis is made from plain circuit board.

The rear end was designed by good friend Tery Cosgrove and was built using parts from Patto's place. The motor is a spare plain old SCX RX41.



The motor pinion drives the first contrate which in turn spins the centre prop shaft and consequently the rear contrate. The bogie is made from circuit board and the axle tubes soldered in it.



Quite a revolutionary approach to the problem. As always there is a bit of mechanical loss but in real life a faster motor would overcome this and the small diameter wheels. It is not a ball of fire and does generate a degree of mechanical noise due to the metal gears but we are working on a nylon gear substitute.



The Williams had the rear deck extended and the diff cover moved back. The car was resprayed with acrylic as the original white had faded quite badly and Mr Bruce 'Patto' Paterson supplied the decals.

The bogie is actually mounted on a centre pivot but, as initially expected, the torque reaction causes the bogie to ride up on the pront pair of wheels. There is now a small bracket and an adjusting screw mounted to one side to allow for the bogie to be adjusted flat on a level circuit and fixed in place.

On board tracks this model corners like it is on rails and also performs well on plastic tracks

The MK 2 is now under construction and this will incorporate a pivoting bogie to compensate for track undulations. It may also be mounted in a Scalextric March 2-4-0 to eliminate body works.
 

·
Registered
Joined
·
3,883 Posts
What very neat work and a nice presentation!
It's such a shame in some ways that every time someone came up with innovative ideas for F1, some other someones managed to find ways to have it stifled shortly afterwards.
My great regret is that I never saw a gas turbine powered car actually running on a track. Never will now I suppose.


With some designers focussed on maximising traction with 4 small rear wheels and others viceing versa with maximising steering grip and low profile, 4-wheel front ends, it's a wonder we didn't ever see the equivalent of an 8-wheel Foden lorry dressed in GP clothes!
Such a shame!
 

·
Scott Brownlee
Joined
·
4,275 Posts
Very nicely done and I admire you skill and patience. I like unusual cars and that Williams has a certain charm.

On the real car the aim was to improve aerodynamic flow, particularly through the rear diffuser, hence the use of narrower tyres. I think the 4WD element was to try to help the smaller tyres last longer, rather than traction benefit of 4WD in the conventional sense.

The earlier, similarly laid-out March was looking for aero gains too, but in that case low drag, as was the six wheel Tyrrell.

However - doubtless motivated by my being a lazy sod - I can't help feeling that on a slot car such a rear 4WD set up offers only disadvantages (friction losses and inconsistent contact patch for the tyres) and no real benefits that some better tyres on a standard rear axle wouldn't give you.

Still a nice model though.

Scott
 

·
Graham Windle
Joined
·
4,442 Posts
I am so glad to see the amount of scaratch builds appearing on this forum now , at one time it seemed the black arts were dying but now ther coming on strong ,Well done wix great stuff keep it coming
 

·
Registered
Joined
·
715 Posts
Here-here, Howmet.

I love this section! Great Williams. I am inspired. I've got a couple of bodies and a chasis just waiting for me to do something wonderful with them.

It would be great if this artform stays alive and everyone does not run off to diecast.

This is a GREAT example of engineering.

-Maltese
 

·
Administrator
Joined
·
4,887 Posts
Very nice and it's inspired me to finally build a Tyrrell 6-wheeler.

David
 

·
Alan Tadd
Joined
·
4,030 Posts
Great work, very interesting solution. Nice choice of chassis material as well.

Regards

Alan
 

·
Registered
Joined
·
312 Posts
Discussion Starter · #10 ·
Thanks for the kind words guys. The concept may be floored in some aspects but like all things it is a stage that has to be passed through to get to the next. ie we had to have the MK1 escort before we had the Focus,

The next idea is threequarters built and is a converted March.

Some of the things that have come from our furtive minds is the single lane pit lane for board tracks (posted somewhere once?? I lose track) The racing circuit with Rally infield and other things.

While most of us enjoy getting down to the track and getting head to head, and rightly so, there is also a small eccentric group plotting the next level! Some will be taken up commercially. Scalex didn't invent the sidewinder but I'm sure they wouldn't be without it now. Digital racing (like it or loathe it) will be the next quantum leap for home and small club racers. Night racing with cars aglow! even I have been sucked into that one and it's good fun.

Some ideas are destined for the archives. I have a horrible feeling that unless Hornby throw money at it, the Moto GP's will sit along side Jump Jockey and Ninja turtles in a lot of collections in 20 years time. I can guarantee, even as we speak, someone is trying to overcome the physics of getting them to lean!

So carry on racing guys and the boffins will see what they can come up with next.
 

·
Premium Member
Joined
·
491 Posts
Wixwacing,
In process of converting a Scalextric March 771/ 2-4-0 to 4 wheel drive and wanted to use your original Williams solution but cannot find that thread on your slot car Outhouse website and the images here have gone. Could you repost or let me nkow where on your site the images are?

Thanks
Stephen
 

·
Registered
Joined
·
3,646 Posts
just looked at the pics and its a really neat solution. I,ve got a 4 wheel drive march on the back burner. it consists or a 5mm round bronze rear axle holder with brass arms soldered to it with holes in for the front axle and small dia pulleys on the inside of both wheels. it will need a pull out front axle and grubscrew gear for assembly. the only reservation I,ve got is when power is applied to the first axle is whether the rear pully drive will lift the rear wheels. I,m hoping the weight of the bronze will cure any of that. will see when I get round to doing it. John
 

·
Registered
Joined
·
4,003 Posts
this was for sale on ebag a while ago.

 

·
Registered
Joined
·
3,646 Posts
that's the sort of thing I had in mind Gordon. but its a bit complicated, I work on the kiss principal and its just come to mind that I can put a grubscrew on top of the swinging back axle to keep it level and stop it riding up, if need be. John
 

·
Registered
Joined
·
4,003 Posts
I thought I was quite a simple solution. c'mon though John , its time you worked out how to post pics , I for one would love to see some of your work!!
 
1 - 17 of 17 Posts
Top