Originally published July 1994
To: Norm Howell, Lord High Exalted Editor, third chief Poobah, and Senior Officer of the Day in Charge of Sprinkler Dismantling
Yo... Major DUUDE; (Possibly premature? but waaay cool)
Regarding the last newsletter article about batteries: You have raised some interesting points that I think should be imediately investigated by the chapter.
Let's see, 12.6 V * 1100 amps means 13860 watts. 13860 watts divided by 746 gives you 18.579088 hp. 1500 amp minutes divided by 1100 amps means 1.36363636363636363636 minutes duration. HMMMMMMM. What can we do with 18.6 hp for 1 minute 21 seconds??
Possible problem 1: Will the battery actually output 1100 amps
for its rated duration? I did not make the last meeting, but suspect
not. P.M.'s and E.E.'s get real weird when you want to test stuff
in this failure mode. Besides the load is difficult to simulate
with a carbon pile. Fires and rapid expansion-like incidents,
you know... Bad Karma... Did I tell you that the last time I was
employed as a test technician we
blew up had
a negative test result to test stand 1C15 at Phillips Lab?? (ed.
note: I think a Titan IV rocket motor was involved somehow too).
Possible problem 2: Will the experiment cause so much excessive heat to be generated that the battery will melt itself out of the subject flying styrene battery holder? (A.K.A. Three Mile Island Scenario.) Test aircraft owners get real weird when this failure mode possibility is mentioned, not to mention the Kern County Fire Department.
Possible problem 3: TEST equipment, or lack therin. Do we know of any spare Quickies or 17 HP 12 VDC motors just lying around so we could test this? Isn't Brian Martinez's Q-200 just about like a Quickie??? I do not see a reason for it to be finished. We have the battery available, just have to swipe it out of subject spam can.(president's note: Hey!!) Maybe we could find an old Ford starter motor.....
Finally: I agree with Mr. Piavis regarding your apparent bias against propeller driven, conventionally geared, low earth orbit, manned inorganic manufacture vehicles with thrust capabilities under, say, 1000 lbs and not burning fuels having octane ratings less than 145 or utilizing a kerosene derivative as a primary reactant. S. Freud might have an appropriate comment about that regarding certain specific inadequacies.
Pete (Paddles) Moore
Contents of The Leading Edge and these web pages are the viewpoints of the authors. No claim is made and no liability is assumed, expressed or implied as to the technical accuracy or safety of the material presented. The viewpoints expressed are not necessarily those of Chapter 1000 or the Experimental Aircraft Association.
Revised -- 22 February 1997