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PS4002FK vs. Hawk 7 motor dimensions


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#1 Gary Pershall

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Posted 27 December 2017 - 12:49 PM

going to build up a couple chassis this week for a race series that runs the PS motors, I only have hawks and can't get any PS motors til next week. Can I use a hawk in the chassis as I build or should I wait until I get the PS motors?






#2 Eddie Fleming

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Posted 27 December 2017 - 01:12 PM

People change between the two motors for different retro series so you should have no problem building around a Hawk.


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#3 MSwiss

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Posted 27 December 2017 - 01:23 PM

If you use a Hawk 7,as your set-up, or jig motor, the Proslot will fit.

They are approx. the same height and width.

On the length, the Proslot may be a tad shorter.

The obvious thing is the Hawk 7 is The same dimension the whole length of the motor.

The Proslot's plastic endbell is varying dimensions, of course, all smaller.

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#4 Gary Pershall

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Posted 27 December 2017 - 02:40 PM

Thanks everyone... Will build away...



#5 MSwiss

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Posted 27 December 2017 - 04:03 PM

Now that I'm at the raceway, I'll add if you use the Hawk 7, I wouldn't run rails right up to the sides of the can.

 

The Proslot is about .015" wider (in the middle, anyway)

 

Also keep in mind the Proslot has screws coming out of the corners, so if you ran rails close to the motor, you might be limited to .062".

 

IOW, I don't think an .078" monorail design would work, unless the rails were out a bit, nowhere under the curve of the motor.


Mike Swiss
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
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17B West Ogden Ave Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#6 Gary Pershall

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Posted 27 December 2017 - 04:06 PM

Thanks Mike, appreciate it.



#7 Richard G With

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Posted 27 December 2017 - 08:31 PM

If you're using a Zpoid type of bracket you'll be OK by using the Hawk jig motor, maybe not if you use a ProSlot jig motor since the PS endbell tapers toward the bearing. In that case, the ProSlot can would be the contact point on the jig but the Hawk's slightly longer length would place it's front below the bottom of the rails.

Keep in mind too that the Hawk electrical connectors are up out of the way but there are conductive bits low on the ProSlot endbell that could get shorted by something like a center pan that floats too far aft.

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#8 Tex

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Posted 28 December 2017 - 07:11 AM

No matter how precise I try to be, the endbell end of the motor tends to droop below the chassis plane UNLESS I put a piece of tape or two on the bottom of the motor when I build the chassis.


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#9 Alan Dodson

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Posted 28 December 2017 - 10:32 AM

Tex, that's because your main rails are too flexible. If you would use .078 or even better, 3/32" main rails, not only would your motor not droop, but then I could probably beat you once in a while! 


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#10 SlowBeas

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Posted 30 December 2017 - 10:41 AM

I use a shim as well under the endbell of my jig motor, just to keep it from dropping below the main rails. I think I soldered a piece of .015 underneath.

 

I only have one chassis with .078 mains, and the thing is so stiff that it doesn't work well on some tracks. I usually go with anything from multiples of  .047 or .055 to singles of .062. That's usually stiff, and yet flexible enough for most tracks.

 

Enjoy building.

jb


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