Astec Models for Radio controlled fast electric model boats and accessories. Brushed motors, brushless motors, speed controllers, ESC's, Lipo Cells, chargers, Hardware, Hulls, Hydroplanes, monos, Cats, wirem connectors and accessories.
Parts from AsTec, Billings, Classic Hydros, Danlions, Etti, Feigao, Flight power, Fullers Fast Electric, Graupner, Hitec, HOR, Hydromarine, Imax, Javis, Mega Motors, Octura, Perkins, Radio Active

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Useful Calculations

Speed related Calculations

Select metric or imperial and fill in any four of the fields
metric (mm) imperial (inches)  
Diameter  
Pitch

 

RPM  
Slip  
Speed  

Length/Distance, convert to:

Click the metric or imperial button and fill in the fields.
NB. Figures not in brackets are the total number bracketed figures are what remains after the higher level is removed.
so 12KM is 7 miles 803 Yds, 1ft and 0.94 inches OR 13123 Yds, 1ft, 0.94 inches OR 39,370 feet 0.94 inches.
  metric (mm)   imperial (inches)
Inches Millimetres
Feet Centimetres
yards Metres
Miles Kilometres
Here is a little gem of a spread sheet provided by Mark Shipman that will allow you to calculate your motor efficiency. No Guarantees with this but it is a very good guide. Mark is always looking to improve it and this one has Lipo and A123 cell capability. Any suggestions to improve please let myself or Mark know. Have fun.

Motor efficiency calculator
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