Reply to "Modified Lionel PW GP power truck...!!"

Dtrainmaster posted:

WBC posted:

DanssuperO posted:

OK  I turned it 21 times  (of the armature  to make   one full revolution  of the wheels) ..........daniel

 

Thus, the gear ratio expected based upon the worm and gear train would be 8.33 + 2.45 = 10.78. 

 

 

That is 8.33 x 2.45 = 20.41:1

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WBC, you're probably right about the 11 tooth pinion; 

9 tooth pinion would give 25:1

10 tooth pinion would be 22.5:1

Dave

 

Yep, multiply not add. That is what I get for rapid posts while at work. 

With at 21:1 gear ratio cogging must nearly be eliminated, but top speed is probably no more than 50 mph.