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FreddyGearDrive Some of Freddy's contributions to our hobby


 
 
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  #1  
Old 07-03-2010, 06:38 AM
FreddyGearDrive FreddyGearDrive is offline
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Default Man! I sure miss my knight!

Built this streched knight about 4 years ago.Was going to make it a Atlas truck,but sold it before I finished it.


Ever since I sold it,done nothing but wish it got finished. So..did some diggin in my parts bins,& this is what I came up with.

Looks like time to bring my dream to reality. First cut out & drilled some nice 31"RAILS

Now the building begins,This is where she's at now.



Plan on going all out on this one,she's gunna have a car hauler on tractor & a 9 speed trany. & I know how you boys all like drom boxes,she's getting one of those also. This drom will be the same higth as the cab.
Thanks for takin a look!
FGD
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  #2  
Old 07-03-2010, 07:33 AM
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Like I said on the other sight WOW!!
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  #3  
Old 07-03-2010, 09:56 AM
FreddyGearDrive FreddyGearDrive is offline
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Thanks Losi!
Some grinding,lathe work,drilling & a bit of talkin to my self,& she's a 9 spd!



This is gunna be a blast,trying to master going through the gears.
Thanks for lookin!
FGD
  #4  
Old 07-03-2010, 10:13 AM
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here we go again... wish I had 1/4 of your extra parts...
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Old 07-03-2010, 04:20 PM
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That's a lotta gears!
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Old 07-03-2010, 04:45 PM
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gonna be like the real deal with that many gears
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Old 07-03-2010, 06:22 PM
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Nice. Bet its gona look twice as good as the first one.
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Old 07-03-2010, 08:07 PM
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thats gonna crawl in first, very cool though,also anyone know the ratios on a semi 3 speed?
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Old 07-03-2010, 08:25 PM
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Here are the stock gear ratios.

Low (1st) gear ratio: 1:32.49
Middle (2nd) gear ratio: 1:17.66
Top (3rd) gear ratio: 1:10.66
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Old 07-03-2010, 11:23 PM
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If i remember correctly 3 of the gear ratios will be doubles, but i'm not up for the math tonight. That aside, the project has a lot of potential and your sure to bring it out.
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Old 07-04-2010, 12:24 AM
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You will end up with a six speed.

You will need to run a high rpm motor because your reductions are going to be insane:

1:1055.6
1:573.8
1:346.3
1:311.9
1:188.3
1:113.6

If the transmission gear ratio provided was correct. Then add an additional 1:3 reduction for the axles.

I cant wait to see the video!!

Nate
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Old 07-04-2010, 02:31 AM
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sig's got a point however i think his math has gone haywire don't you add one reduction to the other? i think you multiplied there will be 9 possible combinations, however 3 will be the same
1 1 : 1/64.98
1 2 : 1/50.15
1 3 : 1/43.95
2 1 : 1/50.15
2 2 : 1/35.32
2 3 : 1/28.32
3 1 : 1/43.95
3 2 : 1/28.32
3 3 : 1/31.32
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  #13  
Old 07-04-2010, 08:08 AM
FreddyGearDrive FreddyGearDrive is offline
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Thanks Guys!
Yea,Sig & wheely,Travis & I figured it to be a six spd on the up shift. One thing guys,the pinion is a lot bigger than stock going into the second trany.
So the ratio of the second will be different from the first.As long as tamiya determans ratio off of pinion & not input gear of trany. Guess I'll find out today! Was going to lay this unit on its side,but turns out I can get away w/it upright.

She's a tight fit,don't think a set of fleas balls could fit between windshield & motor.
Can't wait to see how this all works out w/a mfu. Have a feeling the mfu won't take to this to good!
Well if mfu sound don't work right,I'll have a truck that will sound like a flippin jet.
Here's the motor I'm going to try first.

So you think 30,000 rpms will be enough??
I can't wait to get some juice to this just to see how it acts!
Again, Thanks Guys for the info!
FGD
  #14  
Old 07-04-2010, 08:35 AM
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i was thinking this is on o.k. build until i read "9 gears", this is now an awsome build
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  #15  
Old 07-05-2010, 12:06 AM
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I am going to have to stick with my calcs.

One example, the stock crawler has a gear ratio of 23:1, but if you add the optional gear reduction unit the final gear ratio is 174:1. The optional gear reduction box is 7.4:1. If you take 174/7.4 you get about 23.5.

If you are running a 30,000rpm motor with stock tires, in low-low you should achieve a speed of about 0.103302 MPH, if you follow my calcs. If you add the ratios you would be able to achieve a speed of 1.678145MPH. It should be pretty easy to determine who's calculations are correct at that point.

I am calculating a top speed of 0.95961MPH with a 30,000RPM motor.

You have an awesome build, but no speed demon.

Nate

PS, if my calcs are wrong, I will have to ask for a refund from my engineering college and they may force me to return my masters degree. If I am wrong, I will buy you a coke if we ever meet and if I am right, i will still buy you a coke.
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Last edited by sig p232 : 07-05-2010 at 12:20 AM.


 


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