KADMAC Electric comp result

This year’s event took place in near perfect conditions, light breeze and an overcast sky for the full 2 hours or so of the event, the pleasant to fly in conditions also meant a level playing field for all 7 competitors.

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Charlie Lee kicked of the event with a good solid flight followed by myself and young Jack Bradley who was the first to score a clean 2 minute time on his 3rd. I still find it incredible that you can judge a 2 minute flight with the plane landing dead on the 2minutes, but he did it and so did Harry and Oliver all on the same day.  

Results

1st Peter Harvey 52

2nd Harry Wadington 57

3rd Dave Smith 65

4th Oliver Firth 76

5th Charlie Lee 81

6th Jack Bradley 91

7th Roger Wynne 143

Coming UP

 

Aerobatic comp 1st October from 14.00 with 2nd from 10.00 as a reserve date. CLICK HERE for the schedule.

Scale comp 8th October from 14.00 with 9th from 10.00 as a reserve date.

Indoor flying 2nd October and 23rd October at the normal location, Holy Family School Keighley, starting time around 2pm until 5pm. CLICK HERE for directions.

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Multi Rotor training sessions have now moved to Saturday mornings, so if you’re looking for assistance in gaining a CCA qualification for commercial use or just to gain confidence in your crafts systems please come and join us.

4th October’s club meeting will see Andy Symons of the BMFA attending to give us the latest information on , caa regulations, national centre, A &B test standard’s etc. If you have any questions/ideas or information to put to our governing body, this is your chance.

lipo safety

There are many thoughts by many people on Lipo safety, listed below are the ones which I consider to be the most important.

Please let me know if you have any other thoughts/ideas which can be noted and then passed around to club members.

I gather from most people that Lipos when treated correctly are as safe as any other battery, otherwise we would have umpteen model shops burned to the ground.  Most problems seem to occur while charging and this can happen for a number of reasons.

Never charge a damaged Lipo caused either through crash damage or other reasons.

Best and safest charge rate is 1C which is 1 x the capacity of the battery. Example: a 3000mAh Lipo would be charged at 3 amps.  Some Lipos advertise charge rates of up to 5C and while this may be so it doesn’t do the Lipo any good long term.

The balance lead on a Lipo plays a very important part in the charging process and should be connected every time.   The reason for this, on a normal charge the individual cell voltages are being monitored so no cell should exceed 4.2 volts and the charging process should stop even if some cells haven’t reached the 4.2 limit.
If the balance lead is not connected, say for example on a 3 cell Lipo, the charger is looking for a total finished voltage of 12.6 and it doesn’t know how this value is made up.  One cell could be 4 volts, another 5 volts and the third cell 3.6 volts, the danger being the cell at 5 volts.  With a few chargings like this the overcharged cell is likely to start degrading and swelling up.

I have been told that 90% of heat generated in a Lipo happens in the last 10% of usage causing the Lipo to swell and I consider this to be true through my own experiences of over discharging Lipos.  I now adopt Bill White’s practice of trying to leave 20% capacity in the Lipo at the end of a flight.  Bill is an F3A competition flyer and generally charges and discharges his Lipos at least 800 times with no adverse affects.

The charger and Lipo should be sat on a heat proof surface with the Lipo in a charge sack or bag which will help to limit any damage.

All chargers vary in their set up but most have a few safety features that when activated can stop a potential disaster.

The timer can be set to knock off after so many minutes charging, after a couple of charges you should see how long it takes to charge a certain pack and can adjust the timer accordingly.
The charge limiter can be set to the capacity of the Lipo and again will stop charging when this has been reached.

Remember that if a Lipo starts hissing or bubbling either during or just after charging it is likely to catch fire and once started will not stop until used up.  The heat is very intense as it is a chemical fire which produces its own oxygen so it is best to try and contain it rather than try to move the Lipo while burning.

This leaflet is best read in conjunction with the BMFA’s guide to Lipo safety.

Coming up in June

Two new dates for indoor flyers 12th & 26th June indoor  Indoor meeting Holy Family School Keighley, starting time around 2pm until 5pm. CLICK HERE for directions.

FUNFLY Competition 25th June See post below.

Ones to book in your diary.

2nd July Scale Competition

9th-10th July Aerobatic Competition plus barbeque and ground working party. Cancelled, rescheduled date to be announced  at July club meeting 

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