RC Truck and Construction

RC Truck and Construction (https://www.rctruckandconstruction.com/index.php)
-   Farm Tractors and Implements (https://www.rctruckandconstruction.com/forumdisplay.php?f=10)
-   -   Joskin KTP27/65 Tridem (https://www.rctruckandconstruction.com/showthread.php?t=12339)

Stuart 02-17-2017 01:36 PM

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

kolpen 02-17-2017 04:21 PM

Re: Joskin KTP27/65 Tridem
 
You caught my attention!

Thanks for sharing ☺️

egronvold 02-17-2017 04:23 PM

Re: Joskin KTP27/65 Tridem
 
Off to a good start. It will be an awesome addition to your fleet.

bigdogrod 02-17-2017 04:49 PM

Re: Joskin KTP27/65 Tridem
 
what tires are those?

Stuart 02-18-2017 02:01 PM

Re: Joskin KTP27/65 Tridem
 
Quote:

Originally Posted by kolpen (Post 153151)
You caught my attention!

Thanks for sharing ☺️

Your welcome

Quote:

Originally Posted by egronvold (Post 153152)
Off to a good start. It will be an awesome addition to your fleet.

Thanks Emil

Quote:

Originally Posted by bigdogrod (Post 153154)
what tires are those?

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

kerst 02-18-2017 05:17 PM

Re: Joskin KTP27/65 Tridem
 
Looks great!

Kerst

Grainfarmer 02-23-2017 05:03 AM

Re: Joskin KTP27/65 Tridem
 
Tres jolie remorque! Bien fait... :p

Stuart 02-24-2017 01:43 PM

Re: Joskin KTP27/65 Tridem
 
Quote:

Originally Posted by kerst (Post 153215)
Looks great!

Kerst

Thank You

Quote:

Originally Posted by Grainfarmer (Post 153354)
Tres jolie remorque! Bien fait... :p

Merci Frank!

Today I started the drawbar:

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

Stuart 03-01-2017 01:26 PM

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

Lil Giants 03-01-2017 01:43 PM

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:

Grainfarmer 03-04-2017 10:53 AM

Re: Joskin KTP27/65 Tridem
 
Great job! How did you get the air bubbles out of the suspension system?

Stuart 03-04-2017 11:34 AM

Re: Joskin KTP27/65 Tridem
 
Quote:

Originally Posted by Lil Giants (Post 153527)
Lots of hi-tech on this trl build Stuart :eek: it's gonna be wondrous to see it in motion :cool:

Thanks Joe, gone a bit adventurous on this one!

Quote:

Originally Posted by Grainfarmer (Post 153600)
Great job! How did you get the air bubbles out of the suspension system?

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

Stuart 03-06-2017 01:06 PM

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

kolpen 03-06-2017 03:45 PM

Re: Joskin KTP27/65 Tridem
 
Fantastic. Thank you so much for sharing all your progress!!

kerst 03-06-2017 05:55 PM

Re: Joskin KTP27/65 Tridem
 
beautiful!

Kerst

Lil Giants 03-08-2017 10:46 PM

Re: Joskin KTP27/65 Tridem
 
Well that steering linkage system is gonna be comprised if you travel in extreme terrain! :thinking:

Bo Wallen 03-09-2017 08:14 AM

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. :)

porky69 03-09-2017 09:48 AM

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).

Bo Wallen 03-09-2017 03:32 PM

Re: Joskin KTP27/65 Tridem
 
Quote:

Originally Posted by porky69 (Post 153744)
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).

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.:)

porky69 03-10-2017 08:54 AM

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.


All times are GMT -4. The time now is 11:03 AM.

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.