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Old 05-10-2013, 02:14 PM
Frederik Frederik is offline
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Default Custom made 1:10 RWD solid axle Escort MK2

Hi all,

This is my first post as I joined minutes ago I have just recently discovered this forum and god there is some awesome stuff! I like how there is a lot of scale stuff. I made a thread on RCUniverse and thought I would make one here too.

I recently got interested into doing a somewhat mechanically scale Ford Escort MK2, much inspired by member Trinity2DBone's own scale Escort MK2 (Edit: he is also member prestonlal on RCUniverse). He is doing awesome work on his, and as you will see I did use some of the same part as his build, namely the gearbox, the rear axle and Escort MK2 body from RetroRacing. Here is his thread:

http://www.scale4x4rc.org/forums/showthread.php?t=71407


Here are some of the characteristics and guidelines of what I want to build:

- Fully home made aluminium ladder type chassis
- Solid axle rear end (Tamia CC-01 axle)
- Four link rear suspension, with watts linkage
- Macpherson front suspension, with similar operation as the actual Escort MK2
- Front mounted motor (Tamiya sport tuned black motor)
- Realistic weight distribution, both for center of gravity height and fore-aft weight distribution (I would like it to handle like a real car, and not like an rc racing car)

So I would like it to handle more like a full scale car than like the regular RC tend to handle with their very low center of gravity. It would be great if the car would roll, squat and dive a lot, and the best would be if it turns on three wheels like the real thing





For paint scheme I was thinking the look of a Group 4 rally car that would be just out of the body shop with no decals or actual livery, just one color, likely white, with black details (bumper, mud flaps, grille, rock guards on rear fender etc). This is the kind of look I am after:






So I was looking at different axles, and it is very hard to find axles that would fit nicely on a 185mm wide body, and at the same time be somewhat scale looking. I looked at a few ones like this:



Most properly sized and scale looking axles were discontinued, the only option left was the CC-01 axle which fits perfectly, but I was not 100% sure about the diff casing being off-center, I would have liked it better centered like on real cars. Another option was SDI axles, which are customizable in length with no special tools (thanks Trinity2DBone for mentioning these). I had already pulled the trigger on a CC-01 axle when I finally realized I could have got a single SDI axle for 65 euros. fairly expensive but that would be very scale looking. I also liked having a real diff better, instead of the solid spool found in the SDI axles. I might change my mind once I ride the car and have traction issues

http://sdi4x4.com/product_info.php?c...products_id=67

For wheels I already have some pretty scale looking steel rims looking wheels, and they fit nicely with the Tamiya Rally Blocks I already had from my TB-01 Rally. I plan on using these for the dirt rally mode on the escort, unless the offset does not work (they have a pretty high offset, not sure if it is +3 or +6. I found them on ebay but you can also find them at http://www.genkidoridori.com/index.p...acturers_id=48




Not mine, but these are the same wheels and tires so it should look pretty scale:



Last edited by Frederik : 12-26-2018 at 04:31 PM.
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  #2  
Old 05-10-2013, 02:14 PM
Frederik Frederik is offline
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Bought a Jun Fac drive shaft on ebay. I will probably use it at a pretty extended position to have the motor mounted up front.




Mocking up again:





Here is how I will make the holders for the front lower arms. It will be more like a link really, the ball end linked to the chassis inside the square tube (I will drill a hole in the square tube to slide a pin in)



Here you can see the bracket I made to be able to mount the watts linkage to the diff housing. Well on actual cars it is on the diff housing, center, but mine is off center so I made the bracket to be centered.



Here is how a watts linkage works. This is as seen from behing the car. The small cross mark in the middle is where the linkage is bolted to the diff assembly. This allows for a vertical movement of the axle (without the lateral swing that happens with a panhard rod)



Compressed suspension:



Lifted suspension:




Here is a small video of my wooden test rig, makes it easier to understand:

http://s194.photobucket.com/user/fre...1199D.mp4.html


or this animation:


Last edited by Frederik : 12-26-2018 at 04:35 PM.
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Old 05-10-2013, 02:15 PM
Frederik Frederik is offline
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I had to file the housing a little for the small L bracket to fit perfectly flat as the axle had a small slope starting right there:







You see better what I had to remove here, see the top compared to the bottom of the axle:




And mocking this up again with the watts linkage in position:








And a couple more shots of the axle with almost all its brackets (will need something more to mount the shocks, it's already designed in cardboard but needs to make in in metal)




The tamiya sport tuned motor I just received, and the traxxas turnbuckles so I can have 4 links (I got two off of my traxxas nitro stampede)


Last edited by Frederik : 12-26-2018 at 04:40 PM.
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Old 05-10-2013, 02:17 PM
Frederik Frederik is offline
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For the front macpherson suspension, I bought some used Team Losi XXX shocks, they have threaded body and I think I figured out a way of doing the struts and wheel hub/bearings attachment. No pics yet though. Should be pretty much like the real car, shock attached to hub at an angle of approximately 100 degrees, shock upside down (shaft up, body down) and I will use the shocks ride height adjusters to tighten the shock on the wheel hubs. It will be easier to explain with pics

I will update as I do more work. Hope you guys like it!
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Old 05-10-2013, 03:47 PM
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The Stray Cat The Stray Cat is offline
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Sweet looking project man! Really diggin where you are heading with this! Your chassis and linkage design is definitely cool as well.
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Old 05-10-2013, 04:26 PM
Trini2DBone Trini2DBone is offline
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Hey there Frederik! Welcome to the site! Good to see you over here! I go by the name Trini2DBone here (prestonlal over on RCU) !
Thanks for the props! All my inspiration came from looking at the work being done here!
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Old 05-11-2013, 07:05 AM
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Thanks guys! Just need to find some time here and there to make some progress!
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Old 05-11-2013, 11:44 PM
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ill be following along as well, but i do have to point something out here.

the MK1 and MK2 escorts all had the live axle mounted with leaf springs. I had really hoped you would replicate the leaf sprung rear end and that would then do away with the watts link, and the whole four link in the bum.

i know you have made a lot of effort getting all the geometry correct which is great, but would you not consider leaf mounting the axle??
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Old 05-12-2013, 07:34 AM
Frederik Frederik is offline
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Although the factory Escorts were leaf sprung, it appears to me a lot of rally car builders opt for the 4-link when they prep the cars (that is from googling around lol). There are also a lot using the leaf setup on rally cars, but being a suspension fanatic, the obvious choice for me was to go 4-link and watts linkage, as I never modeled any watts linkage before and wanted to try it out. (I found about it while searching for pics for the escort). The fact almost nobody ever uses watts linkage on RCs is cool too I have seen one or two on here but it was on 4x4 chassis.

I read the 4 link and watts linkage kits for escorts turn them into "rear steerers" even more, I think that is because you can more easily adjust the roll centers by altering the mounting points location.

Thanks for the comments though! It is always nice discussing the different options. Trinity2Dbone happened to choose a leaf setup for his escort build:

http://www.scale4x4rc.org/forums/showthread.php?t=71407

Fred
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Old 05-12-2013, 07:43 AM
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yea, i actually subscribed to that thread. nice build too. I appreciate your view on how to do the suspension, so ill just sit back n watch then ey

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Old 05-12-2013, 07:51 AM
Frederik Frederik is offline
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Well you can sit back and watch but please do not hesitate to post your ideas or suggestions!

After all, discussing it is half the fun another half is building and another half driving it ! Yes thats 150% !! Lol
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Old 05-12-2013, 09:05 AM
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That's some nice scale accurate engineering there.
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Old 05-13-2013, 08:04 AM
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Very nice axle mods so far.
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Old 05-15-2013, 11:07 PM
Frederik Frederik is offline
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^ Thanks!

Small update, I did some work tonight, the two brackets holding the four links to the chassis. Here is a small video of the 4-link moving. Watts linkage not mounted yet.

Edit: cant seem to be able to have the photobucket thumbnail and embed the video in the post so it plays directly from here..




Frederik

Last edited by Frederik : 12-26-2018 at 04:43 PM.
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Old 05-16-2013, 07:23 PM
Frederik Frederik is offline
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A few more pics with the body to have an idea of the height the suspension will need to be. Looks like the chassis will have to habe a little bit of forward rake so the front suspension mounting point (lower arm on the chassis) does not end up too high and the arm at a too steep angle.










And these are the shocks I have found to make the front struts. See I used two of the springs collars (normally used to adjust the height and preload) and I will use them to secure the strut to my custom wheel knuckles. Still thinking of how to make the front strut towers, I have a few ideas.




Last edited by Frederik : 12-26-2018 at 04:46 PM.
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