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Post  Davenz13 Thu Feb 03, 2022 4:06 am

Having posted the general idea of my entry into the Tether Car Speed competition I will post the build here.
This Russian Speed Tether Car gave me the idea for the type of design I decided to build.

Tether Car Speed entry Pic_0010

Rough sketch of design.

Tether Car Speed entry Pic_0024

Scale side view mainly to work out prop ground clearance

Tether Car Speed entry Pic_0025

Scale drawing of final measurements sent to Waterjet Cutters

Tether Car Speed entry Pic_0023

Since most of the cost involved is the programming it’s only material cost for an extra one.
Also had a piece of steel cut 60mm x 60mm x 8mm thick, which the reason for will become obvious in the next photos.

Tether Car Speed entry Pic_0014

The steel piece will be used as a former to help shape the bends accurately.

Tether Car Speed entry Pic_0015

Rounded the sharp edges of one side so as to provide a small radius in the bends

Tether Car Speed entry Pic_0017

Piece of cake with the former held tightly in place.

Tether Car Speed entry Pic_0018

Now for the engine mount.

Tether Car Speed entry Pic_0016

Final checks, everything looks square

Tether Car Speed entry Pic_0019

Rear portion sitting perfectly flat.
I start to get a bit nervous when everything seems to go right without a problem.
That feeling that there's something I've missed which is going to bite me further down the line  Damn!  

Tether Car Speed entry Pic_0111

Final checks and a high five from the Chief Test Pilot as the Snoopworth Camel takes shape.

Tether Car Speed entry Pic_0110
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Post  getback Thu Feb 03, 2022 5:54 am

Hey man thats looking good ! I hate to tell you and should have been announced but Luke bowed out of the CD position. I don't know what the plan is now ? Sad Here on page 3 https://www.coxengineforum.com/t15880p50-prop-rod-2022-a-cef-contest-idea We need to figure something out on this . Old Bugger


Last edited by getback on Thu Feb 03, 2022 5:59 am; edited 1 time in total (Reason for editing : change meaning)
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Post  Davenz13 Thu Feb 03, 2022 12:17 pm

I did see that but decided to build it anyway, probably should have said this "would" have been my entry.
I'm not worried about the competition not going ahead, I'm just glad it gave me the motivation to start this build.
I just want to see if it works.
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Post  roddie Thu Feb 03, 2022 7:17 pm

I think that any interested forum members should still work on a design. Dave (from New Zealand) is obviously serious about competing! Lets build off his energy!
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Post  Davenz13 Thu Feb 03, 2022 11:51 pm

Took a bit of time-out from other jobs to finish the engine mount today.

Tether Car Speed entry Pic_0112
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Post  rsv1cox Fri Feb 04, 2022 12:15 pm

Heck, contest or no contest I'm eager to see Dave's final product!
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Post  Davenz13 Wed Mar 02, 2022 3:52 pm

Part 2

It was here while undergoing air flow tests (compressed air) that it became obvious I had greatly underestimated the weight of the rear section of the vehicle and overestimated the weight of the engine. This can happen frequently when using the guesstimation formula so it's one of the reasons I had two templates made.
I say to people there are no mistakes (nice way of putting it) in my rubbish bin but, “there are a lot of prototypes”.

Tether Car Speed entry Pic_0114



So I cut the axle mounting section out of the spare template and folded it into shape.
Tether Car Speed entry Pic_0113



Then cut the axle sections off the main chassis
Tether Car Speed entry Pic_0115



Briefly experimented with different mounting positions
Tether Car Speed entry Pic_0116



Decided it needed to be adjustable
Tether Car Speed entry Pic_0118
Tether Car Speed entry Pic_0117



I cut 40mm off each side of the rear spoiler to reduce weight in that area and also added some more holes for more adjustment.
Then shaped and cleaned up the chassis.
Tether Car Speed entry Pic_0119



Starting to get somewhere.
Tether Car Speed entry Pic_0210



Had a spare nacelle in the cupboard thanks to Chris Vaughn at Red Venom Repros. I’d sent him some nos Cox Shrike parts to make new moulds and get colour matches and when he sent my ones back, he put a lot of other bits in. Real nice guy.
I’m not a fan of the self-tapping screw mounting arrangement so for custom builds I like to modify the nacelles for machine screws and nuts.
Tether Car Speed entry Pic_0211



Happy with the progress so far. Added two more holes for adjustment. Always have plenty of holes in stock though sometimes finding the right size can be difficult.
Snoopy seems happy with it
Tether Car Speed entry Pic_0212


Next job is to clean up the axle mount
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Post  rsv1cox Thu Mar 03, 2022 6:18 am

Beautiful work Dave, what are you going to use for tires?

Do you have your own water jet cutter or are you sending it out?

This is interesting:

https://www.plantservices.com/blogs/plant-nexus/diy-make-your-own-water-jet-cutter-for-less-than-200/
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Post  getback Thu Mar 03, 2022 6:45 am

Looking Good Dave , glad you had a change in design before you got to far . Nice work! Very Happy
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Post  Davenz13 Thu Mar 03, 2022 9:36 pm

Hi Bob
You can just see the tires in the bottom left corner of the last photo. They're the knife edge speed type I've used on previous builds.
I get the waterjet cutting done by a company that just does that. I've dealt with them since they started, they understand my scribblings, don't mind doing small jobs and send it straight back by courier and email me the bill later.

The pressure cleaner turned waterjet cutter is an interesting read but it's a bit like welding.
I just don't do enough to justify the setup and learn how to do it properly to be able to do it myself.

Hi Eric
I kind of knew before I started that this build would be a series of constant changes as it progressed but that’s part of the challenge and the fun for me.
Overcoming each issue as it arises. Might be able to get it to work okay, might not.
Might end up the “Looked Good, Went Rubbish” cabinet  lol!
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Post  rsv1cox Sat Mar 05, 2022 9:45 am

Thanks Dave, I see them now. Your water jet cutting company sounds like a great place to do business. Setting an example that others should follow.

Bob
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Post  Davenz13 Mon Apr 18, 2022 10:53 pm

Cleaned and sorted the axle mount and also did a drawing of the tether arm and sent that off to the Waterjet cutters.
The template arrived and, in my haste, I didn’t have it properly secured in the mill where it came loose and promptly became a prototype.
I tell people there are no mistakes (nice word here) in my workshop bin but there are quite a few prototypes. lol!

Anyway, I had to make the embarrassing call, admit my error (much laughter on the other end of the phone) and ask to have not one but two cut so that this time, I had a spare. Should have done that in the first place.

Got the milling done this time no problem at all and made a slotted hole in the end for the tether wire.
Usually always goes that way when you have a spare.

Tether Car Speed entry Pic_0215

Had some spare time so shaped the edges and gave it a good polish.
This build has been dragging on a bit and poor Snoopy was almost at the end of his tether.

Tether Car Speed entry Pic_0213

So, I decided to get into it and keep at it until it was finished
The underside arrangement with a little bit of outwards thrust on the engine.

Tether Car Speed entry Pic_0214

An old plastic pill container (have heaps of those in several sizes) got cut up to make a seat and the top off another one became the cushion.
The final product with one happy pilot

Tether Car Speed entry Pic_0218
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Post  getback Tue Apr 19, 2022 5:56 am

It Looks Fast ! Hope you got snoopy secured good LOL Small Cox Logo Good Fun . You going to run it ? Very Happy
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Post  Davenz13 Tue Apr 19, 2022 6:07 am

Yep sure will Eric.
Went and saw my mate today who has the yard where we ran the car that's my avatar. Will give that a run at the same time.
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Post  getback Tue Apr 19, 2022 6:14 am

Popcorn Popcorn Popcorn cheers
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