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Post  John Goddard Wed Jan 23, 2013 6:48 am

Just thinking out loud.....
Most of my cars these days have a spare that's mounted with a very long threaded shaft.
Perhaps bolt it through the wheel and mount your bearing to the other end of the shaft
with cord/wire (whatever) to the bearing.

I doubt the average wheel would be moved by a little car and if worried. one could always
go to a breakers yard and get a BEEEEEG wheel+tyre for a few shekels,
Very Happy

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Post  ado1974 Fri Jan 25, 2013 6:07 pm

ok

i have a front disc off a ford falcon gt... cross drilled, and vented should be getting pulled from the car as i type

picked up some sig stainless wire, and connectors.

just need to make up the bearing carrier and arm and will be set to run

a.
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Post  Cribbs74 Fri Jan 25, 2013 6:20 pm

Cross drilled and vented? It won't help your tether car go any faster Or stop sooner lol!

Just kidding....I couldn't help myself.
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Post  ado1974 Fri Jan 25, 2013 8:54 pm

cribbs74 wrote:Cross drilled and vented? It won't help your tether car go any faster Or stop sooner lol!

true...
but hopefully will look better than a flat plate lol!

a
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Post  ebeneezer Sat Jan 26, 2013 3:30 am

Dont get me thinking it hurts. I,ve never considered a tether car or ever seen one. The only slot cars I ever owned were scalextric. Seeing those pics has got me thinking. Three planes to complete first though. Flying
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Post  ado1974 Sat Jan 26, 2013 7:39 am

ebeneezer

just talk to dizzy... he will tell you there is nothing wrong with "just one more" project...(you have already seen then thread)

cheers
a
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Post  ebeneezer Sat Jan 26, 2013 8:26 am

I now know, one compled project out in the field, is worth ten in the workshop. Flying
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Post  Dizzyman2011 Sat Jan 26, 2013 1:16 pm

So you have a disc and some cable woohoo nearly time to
Let her rip eh ado starting to get excited about running your car it's gonna fly (well hopefully not ) but u see what I'm getting at
Go on ebeneezer get building a tether the more the merrier lets get loads of them running and start some kind of speed /lap race going all over the world have to agree on a line length though
What length were u thinking ado ???
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Post  ado1974 Sat Jan 26, 2013 4:27 pm

i was planning to start with 3.182m from pivot to centerline of car.
that gives 20m/lap
5lap = 100m
50 = 1Km
makes speed calculations easy.

if it looks like it is all getting too fast letting it out to 3.97m
25m/lap
4lap/100m

the shorter line should be ok,
and also makes it easier to find a smooth piece of concrete/tarmac/asphalt

a
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Post  Dizzyman2011 Sun Jan 27, 2013 7:35 am

Either sound good to me like the way you have done the radius so as to easily calculate circumference therefore speed nice touch that can't wait to find out how it goes and also how the friction on the gears holds up should be perfect me thinks as slotty motors go from 15k all the way up to about 25k last time I looked so don't honk you will have any trouble there like the way you can tune the gearing to useful Rpm's that's what mine is sadly lacking but the next one is gonna be along the same lines as yours I think all good fun everyone at work ( mechanics ) said it couldn't be done on such a small scale when I first started this project have proved them wrong now hahahahaha never underestimate a persistent modeller lol!
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Post  Dizzyman2011 Mon Jan 28, 2013 3:52 pm

Any updates have you run it up yet ??
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Post  ado1974 Mon Jan 28, 2013 5:24 pm

not yet dizzy

boss at work goes away wed night for two weeks

will be in there thursday to make the tether pole
(i am off work with broken collar bone at the moment)


a.
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Post  Dizzyman2011 Fri Feb 01, 2013 2:46 am

Any updates me ol chum got it spinning yet ? How did the tether pole go ?
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Post  ado1974 Sun Feb 03, 2013 4:46 am

sorry

been slack... well actually been away for a few days lol!

all going well... this week

a
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Post  ado1974 Sun Feb 17, 2013 6:27 pm

finally got around to making the tether.

front disc off 2012 ford falcon gt.
machined a bearing housing and arm(adjustable for height)

made the tether line from SIG braided steel control line wire
length 3.18m center to between chassis rails, giving 20M/lap

went for first test this morning before it got too hot.

need to do some repairs and mods.
stripped crown wheel, lost grub screw from pinion.
chewed cable(twice) it want to backflip on takeoff, when tuned close to ideal.

onboard igniter broke loose, meaning i had to hand launch with engine running(no push start), causing some of the above problems.

so....
only got a 2 very short vids(need an assistant) of when it was running rich, and when it stripped the crown wheel

https://www.youtube.com/watch?v=NS8ZX9YAKlA&feature=youtu.be

~1.4sec/lap=50kph

https://www.youtube.com/watch?v=UOsAUA2zd6g&feature=youtu.be

and you can actually hear the crunch as the crwown wheel strips... about 0.03 sec
cheers
a
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Post  RknRusty Sun Feb 17, 2013 7:19 pm

I like the rubber stripes it leaves on the pavement. At least you got it out there. My cameraman is a tripod.

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Post  Dizzyman2011 Mon Feb 25, 2013 6:32 am

Hey ado celebration time had its first run out then ok some teething problems but u made it bet your pulse was racing too I'm sure you'll get it running sweet as soon am liking your tether base and setup very swish get the spanners out I need more vids
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Post  nitroairplane Fri Mar 22, 2013 7:13 am

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Post  Dizzyman2011 Sat Mar 23, 2013 11:00 am

Hey bud how ya doin
Saw the vid got any more yet tried mine couple of days ago had tyre issues ie it flew off again DAMMIT!
Oh well plenty more will have to get a vid was just too excited about it looks good less is more with mine where the engineering you have put into yours again is amazing
Need to see
More .... More ..... More .....more
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