Joskin KTP27/65 Tridem
 

My new project, twin steering axles, hydro-tridem suspension (if it works!):

http://i1252.photobucket.com/albums/...pseovc5gue.jpg

http://i1252.photobucket.com/albums/...pshzl2eyog.jpg

http://i1252.photobucket.com/albums/...psig3gm7fo.jpg

http://i1252.photobucket.com/albums/...ps39nsm6py.jpg

http://i1252.photobucket.com/albums/...psoxudifu5.jpg

First steering axle:

http://i1252.photobucket.com/albums/...psonsq081u.jpg

Mounted:

http://i1252.photobucket.com/albums/...ps9zzpsnvu.jpg

http://i1252.photobucket.com/albums/...psycvvpctm.jpg

http://i1252.photobucket.com/albums/...psfi3hcmci.jpg

Started the 2nd steering axle today:

http://i1252.photobucket.com/albums/...psabsqsbcd.jpg

Cheers
Stu

Re: Joskin KTP27/65 Tridem
 

You caught my attention!

Thanks for sharing ☺️

Re: Joskin KTP27/65 Tridem
 

Off to a good start. It will be an awesome addition to your fleet.

Re: Joskin KTP27/65 Tridem
 

what tires are those?

Re: Joskin KTP27/65 Tridem
 

Your welcome

Thanks Emil

Round ones made from rubber :p .... Found them on modelltruckforum.de

Finished the 2nd steering axle today:

http://i1252.photobucket.com/albums/...pszghnmevm.jpg

http://i1252.photobucket.com/albums/...ps6frvhvf6.jpg

http://i1252.photobucket.com/albums/...ps0ycoy4fl.jpg

http://i1252.photobucket.com/albums/...pskiw2yy7i.jpg

http://i1252.photobucket.com/albums/...psim0pgj83.jpg

http://i1252.photobucket.com/albums/...psh4mcdvxf.jpg

Now to sort the steering, mechanical linkage or servo, can't decide, might try the linkage method first.

Then onto the hydro-tridem suspension, not sure how thats going to turn out...:eek:

Thanks for looking

Stu

Re: Joskin KTP27/65 Tridem
 

Looks great!

Kerst

Re: Joskin KTP27/65 Tridem
 

Tres jolie remorque! Bien fait... :p

Re: Joskin KTP27/65 Tridem
 

Thank You

Merci Frank!

Today I started the drawbar:

http://i1252.photobucket.com/albums/...ps3rtjgemv.jpg

Re: Joskin KTP27/65 Tridem
 

Fitted the draw bar:

http://i1252.photobucket.com/albums/...ps9b9loacj.jpg

Then converted the 1/10 shocks into single acting cylinders for the hydro-suspension:

http://i1252.photobucket.com/albums/...slmhpmabz.jpeg

Filled them with oil to create a closed loop hydraulic system:

http://i1252.photobucket.com/albums/...sk4utmkcx.jpeg

http://i1252.photobucket.com/albums/...psnhyz6cw7.jpg

http://i1252.photobucket.com/albums/...ps7scbn5m6.jpg

http://i1252.photobucket.com/albums/...psa6nbtqkd.jpg

http://i1252.photobucket.com/albums/...psgfcbjyub.jpg

Thanks for looking
Stu

Re: Joskin KTP27/65 Tridem
 

Lots of hi-tech on this trl build Stuart :eek: it's gonna be wondrous to see it in motion :cool:

Re: Joskin KTP27/65 Tridem
 

Great job! How did you get the air bubbles out of the suspension system?

Re: Joskin KTP27/65 Tridem
 

Thanks Joe, gone a bit adventurous on this one!

Thanks Frank,

I connected the 3 cyls with the hoses then turned them upside down without the pistons fitted.
Filled no.1 with oil and put the piston in, pushed gently until oil appeared in the bottom of no.2, filled no.2 with oil and fitted the piston but pushed it all the way in then did no.3.
That way when 1 cyl is fully closed the other 2 are fully extended, et voila!

It works a treat, there a little on the tight side, may need to take a tad out the piston groove to loosen it but I'll try it loaded first.
I worked out that with a 15Kg load the pressure in the cyls is around 9 bar, should be ok, I hope!

Having trouble with the steering geometry at the moment, I've got too much travel at the axle end and it reaches full lock too soon so need to tweak the angles a bit, will update once done.

Stu

Re: Joskin KTP27/65 Tridem
 

Got the steering sorted then made some brass connecting rods:

http://i1252.photobucket.com/albums/...psi3ywlh54.jpg

http://i1252.photobucket.com/albums/...psw2wptxt1.jpg

http://i1252.photobucket.com/albums/...pson8839lv.jpg

http://i1252.photobucket.com/albums/...sxnp9ikfs.jpeg

http://i1252.photobucket.com/albums/...ps9l0nswyv.jpg

http://i1252.photobucket.com/albums/...ps6mlxrfr5.jpg

couple of videos:

Test 1

Test 2

Cheers
Stu

Re: Joskin KTP27/65 Tridem
 

Fantastic. Thank you so much for sharing all your progress!!

Re: Joskin KTP27/65 Tridem
 

beautiful!

Kerst

Re: Joskin KTP27/65 Tridem
 

Well that steering linkage system is gonna be comprised if you travel in extreme terrain! :thinking:

Re: Joskin KTP27/65 Tridem
 

Great work. However the straight axle should change place with the first steering axle. Otherwise the trailer try to go inside of the tractor and make two radius. Just my 2 cent. :)

Re: Joskin KTP27/65 Tridem
 

With 1st and 3rd axles steering they counter each other(front turns left rear turns right and vice versa) and allow for sharper turns without skidding the tires (should only leave one tire track that is undisturbed on each side).

Re: Joskin KTP27/65 Tridem
 

That would work if the trailer/Wagon wasn't hooked to a tractor with a drawbar.
That changes the pivot point from the center of wagon to somewhere else depending on length of drawbar e.t.c. Look at the video and pic.:)

Re: Joskin KTP27/65 Tridem
 

I just watched a couple of videos on http://www.joskin.com/?page=transpor...7&user_lang=en and from what I saw it(the 1:1 version of what this one is modelled off of) works pretty much exactly like I described so I don't see why with a little fine tuning on linkages that the model would be any different.

Re: Joskin KTP27/65 Tridem
 

Exactly what I was going to say :D

I think I have a bit to much steering angle at the moment but with a bit of tweaking should be spot on.

As for "Extreme Terrain" Joe, its not a rock crawler :p

Re: Joskin KTP27/65 Tridem
 

A small update:

http://i1252.photobucket.com/albums/...psbqb9wu9t.jpg

http://i1252.photobucket.com/albums/...pskhj1nnmb.jpg

http://i1252.photobucket.com/albums/...psxgpygraq.jpg

http://i1252.photobucket.com/albums/...pszubf3w91.jpg

Re: Joskin KTP27/65 Tridem
 

Hi Stuart

Looking good man looking good cannot wait to see it in action.

Re: Joskin KTP27/65 Tridem
 

Been awhile but made some progress:

https://preview.ibb.co/ktPUAb/IMG_0920.jpg
https://preview.ibb.co/iD5SVb/IMG_0919.jpg
https://preview.ibb.co/hfQGOw/IMG_0775.jpg

first hydraulic test: video

Thanks for lookin

Re: Joskin KTP27/65 Tridem
 

Good to see you're back at it. Any more pics from the ones missing on the first page?

Re: Joskin KTP27/65 Tridem
 

Have you seen the link that Bo Wallen posted about the photobucket workaround? It worked for me.

Some more progress:

https://preview.ibb.co/k13Fd7/IMG_1124.jpg

https://preview.ibb.co/hOosQn/IMG_1125.jpg

https://preview.ibb.co/cM1wkn/IMG_1128.jpg

https://preview.ibb.co/hZaYWS/IMG_1129.jpg


Couple of vids:
Video 1
Video 2

Stu

Re: Joskin KTP27/65 Tridem
 

Very nice work, great to see something out of the ordinary. Who's hydraulics are you using?

Re: Joskin KTP27/65 Tridem
 

I like it! it's looking good.

Re: Joskin KTP27/65 Tridem
 

24Bar... will you be putting compression collars on your fittings upon final assembly?

Re: Joskin KTP27/65 Tridem
 

Thank you, I'm using a combination of Magom and Chinese stuff.

Thank you

Yes Joe I will, they're sitting in a bag on the bench, I put one on the cylinder lift pipe then forgot the others doh!

Mind you, whilst setting the pressure relief I had it up to 30+ bar with no issues...but for piece of mind I will fit them.

Do you think it needs them on the return side?

Did a little sheet bending tonight:

https://preview.ibb.co/enOCd7/IMG_1134.jpg

https://preview.ibb.co/m1A3kn/IMG_1137.jpg

https://preview.ibb.co/fY9UQn/IMG_1135.jpg

https://preview.ibb.co/dgAay7/IMG_1136.jpg

https://preview.ibb.co/muDvy7/IMG_1133.jpg

Re: Joskin KTP27/65 Tridem
 

now it REALLY does look like something. This thang will be an when completed!

Re: Joskin KTP27/65 Tridem
 

Return side? Yes, you will max pressure when cyl deadheads for a second or two... might get away with it for 20 - 50 lifts, but that hyd line is always ever so little ballooning with pressure... better safe than oil spraying everywhere, no fun to clean up.

When you disassemble for paint, do you cut the hose off the barb or force-ably pull it off? ...I always split the hose with a #11 knife off the barb.

What's the loading height of your box from the ground?

Re: Joskin KTP27/65 Tridem
 

No your right, been there, done that!
So ok I'll fit to all the 3mm hoses.

Yes I have to cut them off the barb with a craft knife, no way you can pull them off, once they're on they're on.

Loading height is 185mm

Re: Joskin KTP27/65 Tridem
 

Thanks skeeter, not sure what you meant to say it will be though lol.

Started the tail gate:

https://preview.ibb.co/ivazAn/IMG_1138.jpg

Re: Joskin KTP27/65 Tridem
 

LOL, yeah, I make a LOT of typos

SHOULD have read that thing will be AWESOME when completed. SOMEHOW, that part got deleted as I was typing it. I HATE them keyboard hotkey things. I DON'T even realize that I've accidently hit one of them, or for that matter what combination of keys I hit to make ti do that!

Re: Joskin KTP27/65 Tridem
 

Ha ha, I know what you mean lol.

Got the front end done, just the sides left to do then glue it all together:

https://preview.ibb.co/hWkUy7/IMG_1141.jpg

https://preview.ibb.co/mh7yrS/IMG_1142.jpg

Re: Joskin KTP27/65 Tridem
 

Wouldn't fit in the oven so had to improvise lol

https://preview.ibb.co/e0UGVx/IMG_1144.jpg

https://preview.ibb.co/heWwVx/IMG_1146.jpg

https://preview.ibb.co/hi90qx/IMG_1147.jpg

https://preview.ibb.co/dCoRVx/IMG_1148.jpg

https://preview.ibb.co/gAfC3H/IMG_1150.jpg

https://preview.ibb.co/jFwwVx/IMG_1151.jpg

https://preview.ibb.co/jnJX3H/IMG_1152.jpg

Re: Joskin KTP27/65 Tridem
 

Well that's taking shape nicely Stuart :cool:

What glue did you use?

Re: Joskin KTP27/65 Tridem
 

looks great can't wait for updates

Re: Joskin KTP27/65 Tridem
 

Thanks guys,

Joe I used UHU endfest 300 plus 2 part epoxy, the hotter it is the quicker and more importantly, stronger the bond is.
I applied the glue at room temp (approx 20*C)
The top of the stove was 274*C and the trailer was around 70*C