22nd-Apr-20, 08:06 PM
The tyranny of numbers....While Carver is making (should I say outstanding) progress on the coachwork, EM is still, literally, scratching along with pencil on paper:
The current arithmetic - The critical measurement is the width of the body at the back of the rear tires. On my drawing I make that to be 44.2mm. Now, assuming my esteemed colleague can come up with some magic material to reduce the thickness in that region to 1.5 mm on each side, that means that the O/A width of the axle/wheel/tire combination must be a bit less than 41 mm (allowing for a bit of clearance)
One set of gears arrived today. The spur gear is a fine example of minimalism measuring just 4 mm over the hub. The 13" X 5 mm wheels from RS Slotracing are currently in transit - looking at the photo and using an "eyeball optical comparator" I'm going to guess 7mm over the hub so....
4 mm + 2 X 7mm = 18 mm - now add a motor:
FF 050 (soldered in with no allowance for screw mounting) 30.65 mm - adding 18 mm and rounding..."Houston, we have a problem"
Plan "B" .. Bear dog or equivalent FF 030 motor - motor, gear, wheels all fit with space left over for a set of golf clubs! - This is a small car and the shell is looking very light so the small motor might have adequate power (and brakes)
Options? FF 050 motor in an angle winder configuration (more complex chassis - not a lot of experience here with that style) Different wheels - A CB design 14" X 6mm wheel - "hub less" design and perhaps enough meat to turn off another 0.5 mm - 5.5 mm instead of 7 mm but still not there for the 050 sidewinder.
The noise you may be hearing in the background is the grinding of mental gears....
To be continued..
EM
The current arithmetic - The critical measurement is the width of the body at the back of the rear tires. On my drawing I make that to be 44.2mm. Now, assuming my esteemed colleague can come up with some magic material to reduce the thickness in that region to 1.5 mm on each side, that means that the O/A width of the axle/wheel/tire combination must be a bit less than 41 mm (allowing for a bit of clearance)
One set of gears arrived today. The spur gear is a fine example of minimalism measuring just 4 mm over the hub. The 13" X 5 mm wheels from RS Slotracing are currently in transit - looking at the photo and using an "eyeball optical comparator" I'm going to guess 7mm over the hub so....
4 mm + 2 X 7mm = 18 mm - now add a motor:
FF 050 (soldered in with no allowance for screw mounting) 30.65 mm - adding 18 mm and rounding..."Houston, we have a problem"
Plan "B" .. Bear dog or equivalent FF 030 motor - motor, gear, wheels all fit with space left over for a set of golf clubs! - This is a small car and the shell is looking very light so the small motor might have adequate power (and brakes)
Options? FF 050 motor in an angle winder configuration (more complex chassis - not a lot of experience here with that style) Different wheels - A CB design 14" X 6mm wheel - "hub less" design and perhaps enough meat to turn off another 0.5 mm - 5.5 mm instead of 7 mm but still not there for the 050 sidewinder.
The noise you may be hearing in the background is the grinding of mental gears....
To be continued..
EM
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