The Harbor Freight Challenge

Speed 400 Electric Radio Assist

Speed 280 Electric Peewee Replica

Electric Airplane Photos

Electric Addendum to the 2000 Rules

Rules for Ed Shilen Sponsored Electric Rubber Model RC Events

SAM 8 Electric Rules

SAM Battery Rules for 2008

The SAM Electric group has made new battery rules for 2008. They now are allowing NiCd, NiMh, And LiPoly cells.

The rules are based on a 7.2V battery. This is 7 NiCds cells, 7 NiMh cells, or 2 LiPoly cells. You are allowed 100mah capacity for every 1/4 pound of all up flying weight. Ie, a 16oz airplane can have a 7 cell 400mah NiCd, 7 cell 400mah NiMh, or a 2 cell 400mah LiPoly.

But there is an allowance for more cells of lower capacity. An example is a 8 cell NiCd of 87.5mah could be used in place of a 7  cell NiCd of 100mah.

The easy way to calculate a battery is to multiply 2800 by the all up weight in pounds then divide it by the number of cells you desire to use.

Example:

For a Peewee the has an all up weight of 8oz. 2800 X .5lb = 1400. Then 1400 / 8 cells = 175.  This would allow 8 150mah NiCd cells instead of 7 cells.

An alternate way would be to divide the 1400 (in this case) by the mah of available cells. Ie, 1400 / 110(mah) =  12.72 cells. Or 1400 / 150 (mah) = 9.3 cells.

The key here is to find the maximum number of cells you can use based on the capacity of available cells.

For our contests I will be making up marked battery packs on request. These will be acceptable to the CDs for the purpose of these contests.

Bob Macklin

RottenRobbie