Project Red Hotshot (11th Mar,2010 updated)

[tiger1]

Why cut the wing mount?....

I think I can speak on behalf of minimini: it is simply smarter to mount the wing on the rear shock tower!

I would do the same

I now understand why you ask me to give you one more shelf.
Oh tiger~ you are bad

Next time I may take away the shelf to save some cost.

Hey, I am NOT the bad guy. I got a few things from you (Emerson) and minimini IS the bad guy who chopped up the wing tower. I was just saying that I 'would' do the same but I have yet to do it. Nice product.

[minimini]

Why cut the wing mount?....

I think I can speak on behalf of minimini: it is simply smarter to mount the wing on the rear shock tower!

I would do the same

I now understand why you ask me to give you one more shelf.
Oh tiger~ you are bad

Next time I may take away the shelf to save some cost.

Hey, I am NOT the bad guy. I got a few things from you (Emerson) and minimini IS the bad guy who chopped up the wing tower. I was just saying that I 'would' do the same but I have yet to do it. Nice product.

ahaha...........I do not mind being a bad guy.........provided that I am doing the right & meaningful thing.........

as you all know.......DIY is one of the major components of vintage R/C cars........& every single car got their own character........no compromise........

[tiger1]

overheating of motor was a common problem in the Hotshot series...........many racers in the old days did experience melting of the rear gear box because of the great heat generated by the motor..........horrible.........

in view of this.........I prepared two pieces of motor insulator plates........plus a metal heat sink (from a kyosho car) in between.........make it like a piece of Orio......... ...........hope to improve a bit........

Hey, which Kyosho car was this metal piece (heat sink) from??

[minimini]

overheating of motor was a common problem in the Hotshot series...........many racers in the old days did experience melting of the rear gear box because of the great heat generated by the motor..........horrible.........

in view of this.........I prepared two pieces of motor insulator plates........plus a metal heat sink (from a kyosho car) in between.........make it like a piece of Orio......... ...........hope to improve a bit........

Hey, which Kyosho car was this metal piece (heat sink) from??

during that time .......... every kyosho car came with this metal piece........I got mine from one of my optimas........

[tiger1]

Many people said the hotshot diff was stiff and sometimes noisy. Some blamed it on the e-clip that was used to retain the diff outdrive.

Here is what I did, I polished the contact surfaces of the gears (not the 'teeth' though), just polish them so that they are smooth but not mirror shine.

The set on top was original condition. The set in the bottom was the polished set.

I put them into my front gearbox, just nice and smooth with perfect tightness!!

[tiger1]

I tried to get something special for my red hotshot. I remember long ago someone made some ball differential for hotshot. I also know they cost a tons of $$ now, only if one is lucky to find them....

Then I saw a Paranoia Fox diff for sale here. I know fox and hotshot has the same 47 gear but the drive cups fits differently. But I decided some surgery is all it takes

The width of hotshot diff was approximately 15.9mm. This Paranoia fox diff was approximately 21.0mm in width. First, I removed that excess ~5mm width from the diff hubs. I heard that the original hotshot gear diff was a little tight, so I arbitrarily reduce the width of my ball diff so that the resulting width is approximately 15.4mm. At 15.4mm, the differential spins freely in the assembled gearbox

Then what I did was I sacrificed a pair of 959 wheel hubs, shaved it down to about 1mm thick in diameter. Opened up the diff to house the modified hubs, made sure I left about 1mm think material as well. Use some 0.75mm stainless steel wire to key the pieces together and bonded them with JB Weld epoxy. All these were done without a lathe, just hand held rotary tools. The challenge was to keep things center and true. Anyway, the result was rock solid!!!

A ball diff for the hotshot

[cooltoys]

Nice mod on the ball diff..

[tiger1]

Thanks for the comment

More work is being done on my red-shot