[NSRCA-discussion] Lost Abbra

[vicenterc at comcast.net]

Hi Chris,

Thanks.  The brand is Batteries America.  Sanyo model HR-3U.  I open and the connections are construction is clean and well done.  I am using these batteries in other two planes and I have no indication of problems with the switch.  Therefore, at this point I am completely clue less.  I flew my YAK 54 after the crash with the same TX and frequency.  As we said in Spanish one nail takes care of another nail.  I am not sure how to translate in English. 

Vicente "Vince" Bortone 

-------------- Original message -------------- 
From: Chris Moon <cjm767driver at hotmail.com> 

> Sorry about your crash. What kind of battery (brand) did you use? A 
> couple of years ago I used ni-mh from Tower. Their Hydrimax brand. I 
> almost lost a plane due to the plastic shrink wrap nearly cutting 
> through the lead. Luckily I had it fail on the bench and if I wiggled 
> the wire, it would work sometimes. I cut off the wrap and was shocked 
> at the construction. It used scotch tape to hold the wires and masking 
> tape to insulate the tabs from touching. I would check that out and 
> also the switch for an intermittant connection.. 
> Chris 
> 
> vicenterc at comcast.net wrote: 
> > 
> > Yes, yesterday afternoon I lost my Abbra. I was doing the 45 degree 
> > down with snap. After the snap, I could not control the plane. This 
> > is my recollection of events: 
> > 
> > 
> > 
> > 1. I over rotated the snap for a kittle more than 90 degrees. It was 
> > clear to me at that early stage that something was going wrong. I 
> > snapped to the right. 
> > 
> > 2. My friend Charlie was calling for me. He also noticed and said 
> > something to put it back in position. I told him that the plane was 
> > not responding. 
> > 
> > 3. First reaction was to give full left to get it back upright. The 
> > ailerons did not respond. When I realized that, I tried to take it 
> > out of the dive by given down elevator since was pracically in 
> > inverted position. It did not respond. It that aptitude everything 
> > goes very fast. Finally, I tried to give up elevator but was already 
> > too late. I am aware that I applied these control input. It was 
> > clear to me that there was no reaction. I was able to realize that I 
> > didn't have control and I could not avoid the crash. 
> > 
> > 4. I did not have time to do anything with rudder and throttle. 
> > Throttle was at idle. 
> > 
> > 5. When we checked the crash site. One aileron servo was buzzing 
> > hard. I disconnected the servo. Therefore, my first impression that 
> > the battery flew off and it got disconnected with the force of the 
> > snap was not valid. 
> > 
> > 6. I took the plane home as it came from the crash. I disconnected 
> > only the ailerons servos. I checked the radio and everything is 
> > working fine. Only two servos are not working. The throttle servo 
> > that was practically destroyed in the crash and one aileron servo that 
> > the gears were stripped. I believe that this was caused by the force 
> > of the impact. There was not evidence of flutter in the ailerons 
> > before the crash or structural damage after coming out of the snap. 
> > 
> > 7. I believe that the plane was well over stall speed after the snap. 
> > Therefore, the plane was not in stalled condition. However, I could 
> > be wrong. 
> > 
> > 7. I use JR all around with digital servos. PCM receiver with fail 
> > safe programmed to cut engine and leave the servos in the last 
> > commanded position. 
> > 
> > 8. I use 2300 mah NiMh battery (4 cells AA Sanyo). I checked the 
> > battery voltage and was at 5.15 volts after the crash. Discharged the 
> > battery and gave 1540 mah using 250mah rate. I am planning to cycle 
> > the battery with higher loads. 
> > 
> > 9. It was very hot day. The plane was sitting in the sun and it was 
> > second fly of the day around 2:00 PM. Easily was close to 100 oF. 
> > 
> > 
> > 
> > At this point, I have to admit that has to be pilot error since I have 
> > not been able to find a definitive cause of the crash. It is clear 
> > that the snap initiated some kind of failure. Other pilots think that 
> > the NiMh battery gave up at high currents during the snap and caused 
> > the crash. I have been flying this type of battery for two years now 
> > with no problems. 
> > 
> > 
> > 
> > I am informing this to the group since I would like to have your 
> > feedback. If someone had a similar problem and found the cause of the 
> > crash, please let me know. I am going back to my backup plane (the 
> > old hydeout). I have a brand new Abbra so need to put it together. 
> > 
> > 
> > 
> > Thanks and have a nice day, 
> > 
> > 
> > 
> > Vicente Bortone 
> > 
> > ------------------------------------------------------------------------ 
> > 
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