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Cox Mercedes with an interesting front suspension modification.

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Cox Mercedes with an interesting front suspension modification.

Post  rsv1cox on Thu Mar 14, 2019 2:14 pm

The Achilles heel on these is the fragile and near impossible to find front suspension axle spring.

Mudhen searched for a replacement here a while back to complete a model for his friend Cole Williams the designer of the model who did not have one of his own. He finally found one and gifted the completed model to him.

https://www.coxengineforum.com/t11886-cox-mercedes-benz-w-196-911-help-front-axle-spring

Well, this fellow had a different approach. Looks pretty normal from the outside.



But....




Also missing the driveshaft. I contacted the seller and he said it belonged to his grandpa who collected Cox model planes and cars and made the repair.

Sterling effort but not functional. To much flex in the brass plates as the suspension bottoms out with no travel. I have to figure a fix as I want to maintain his idea.
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Re: Cox Mercedes with an interesting front suspension modification.

Post  NEW222 on Thu Mar 14, 2019 3:37 pm

I do not know how original you want to keep the repairs that are there, but may I suggest re-doing it only with heavier gauge brass plate or similar?
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Re: Cox Mercedes with an interesting front suspension modification.

Post  rsv1cox on Thu Mar 14, 2019 4:02 pm

NEW222 wrote:I do not know how original you want to keep the repairs that are there, but may I suggest re-doing it only with heavier gauge brass plate or similar?

Thanks Chancey, and yes, suggestions please.

I would like to keep his repair or the concept of it.  My simplistic approach is to epoxy on top of the existing plates wooden tongue depressors.  But there has to be a solution better than that.

It's interesting how he bent over the tabs on the posts which by friction keeps them in place and how the down angle does add some down flex control but not nearly enough.

Bob
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Re: Cox Mercedes with an interesting front suspension modification.

Post  rsv1cox on Fri Mar 15, 2019 10:28 am

My son came up with a good idea, chip off the old block.  

Coil springs.  Hmm, possibilities.  Captured coils, McPherson struts, Coil overs.    

I'm thinking captured coils cut to length and centered.  I found a couple among my stuff that might work but I need four.  Any hardware store has selections.  Play with these for awhile to ball park then buy what I need.




Going to add an alignment dowel that the PO forgot to include.  



A mess now, but out of disorder will come order. Hopefully.  Going to paint it silver, inside and out.  Always wanted a silver one like they ran at Le Mans.  No collector value here.  Maybe a May first runner after an over-spray of Top Flights Lustrekote clear.



BTW, these do have suspension travel of about 1/4 - 3/8th" front and rear.


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Re: Cox Mercedes with an interesting front suspension modification.

Post  fredvon4 on Fri Mar 15, 2019 11:46 am

Your son beat me to the recommendation coils...considering how you like to rebuild to factory spec...AND sometimes like to retain the original owner's ingenious modifications...this one seems to demand the later...IMO
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Re: Cox Mercedes with an interesting front suspension modification.

Post  rsv1cox Yesterday at 10:12 am

fredvon4 wrote:Your son beat me to the recommendation coils...considering how you like to rebuild to factory spec...AND sometimes like to retain the original owner's ingenious modifications...this one seems to demand the later...IMO

It worked out pretty well Fred.

Remembered my Wolff compression spring assortment from my old gun smithing days that expanded my options.  Decided on 8/32's machine screws vise 10's and selected a spring that mostly duplicated the originals resistance which can be adjusted simply by turning the nut.




I still need to do a little fine tuning but I'm in the ball park.

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Re: Cox Mercedes with an interesting front suspension modification.

Post  fredvon4 Yesterday at 10:50 am

Necessity the mother of invention....I think your collaborative* effort with the original owner is probably a better front suspension than factory stock

*even if he/she is/was not consulted....grin
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Re: Cox Mercedes with an interesting front suspension modification.

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