Balancing Severely Out of Balance A123 Pack

The following is a recent exchange discussing some charging logic that is impacted often by time-out settings in chargers. Not a bad thing all in all. The same logic can be applied to Lipo packs as well. Hi, Dave: Here’s my situation: All of my A123 batteries...

Scratch Building: Transfer A Drawing To Wood

We’re converting a Hobby Lobby Telemaster into a 1928 Fairchild FC-2W2 for a National Parks Service program. This aircraft was the first ever owned by NASA and later the first owned by the National Parks Service. Information link at bottom. While making a...

Crash Investigation, Why did it crash?

Just as in full scale aviation, crashes are often because of a sequence of things going wrong. I received a letter recently asking my opinion on a set of circumstances. At the time of this writing there is no 100% sure answer, not enough info is provided, however...

Iowa City AeroHawks Nice Remarks

Good Morning Dave: Attached please find a flyer advertising our 10th annual swap meet scheduled for January 20th 2013. You participated in one of our first swap meets several years ago and gave us some very valuable suggestions which we took to heart. We have grown...

Lipo Battery Disposal

Warren Behymer asks and interesting question: I need to know how to dispose of LiPo battery that has swollen due to an overcurrent. There are two issues. 1. We want to discharge the battery in such a way as there is minimal risk of fire during the discharge and later...