KADMACaerobatic1

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.

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Up and coming

Scale comp 24th September from 14.00  with the 25th from 10.00 as a reserve date.

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Aerobatic comp 1st October from 14.00 with 2nd from 10.00 as a reserve date.

2nd. Tuesday 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.

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Can you justify unsafe flying to your club mates.

Threat to Model Flying from European Regulation – EASA Prototype Rules for Unmanned Aircraft

EASA’s intent with Article 15 was to allow national authorities (like our own Civil Aviation Authority) some freedom to largely maintain the ‘status quo’ for model flyers, but only for the benefit of ‘those operating within associations or clubs with proven satisfactory safety records’.  However, the ‘Prototype Rules’ lack clarity on how this would be achieved in practical terms and still leave the potential for large areas of the proposals to be applied disproportionately to model flying.

Please click here to read the full proposal.

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.

Lipo FIRE

Earlier today it was reported to me that Nick Hemple has had a Lipo fire within his model room which is situated within his house. First reports are that whilst there is extensive damage to his model room the rest of the house has only sustained minor smoke damage and everyone got out safely.

Comment from Nick.
Reading about lipo fires in no way prepares you for the event, apologies to my wife Nancy and a warning to us all. I don’t know if I will trust them, or myself again.
PLEASE TAKE CARE

I think we can all appreciate the sentiments in Nick’s comment and as members of KADMAC we would like to offer any support as needed to  Nick and his family.

A full report will be issued as and when the full facts are ascertained.

nick 1

My first thought after find out everyone was ok, was how many times have I nipped off for my tea or some other reason when charging my lipos, never again

nick 2

This might not be an appropriate time to mention this, but recently a lot of house insurance policies have taken to excluding aero modelling actives. I think this must be a good time to check ours.

If you would like information on Li-Poly use and safety please checkout in our Handbook section of this website.
LITHIUM POLYMER BATTERY SAFETY BOOKLET
written by  Bob Smith

Battery safety

Or Click Here

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What’s coming UP

Everything has been a bit quirt within KADMAC for the past month or so with members being on holiday or attending model shows and even away competing.  I have news of two confirmed events coming up.

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1st. Indoor flying will be restarting on Sunday 4th September at Holy Family School Keighley, starting time around 2pm until 5pm. CLICK HERE for directions.

2nd. Tuesday 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.

Also coming up late September early October will be our club aerobatic, scale, electric and control line competitions. Watch this space.

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New Club Trainer

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Today saw the new club trainer make it’s maiden flight, piloted by Bob, who is a new member to the club, using the buddy lead system.

Although not easy to fly in windy conditions Bob made a very good attempt on his first ever flight and is looking forward to flying again hopefully in calmer conditions.

 

 

Scale comp

Last weekend Nick Hemple had to call off the scale competition due appalling weather conditions, as the calendar for this year is now quite congested we will be running the event this coming Saturday 9th July from 14.00.

In the event this weekend is weathered off we will set a new date at the next club meeting.

KADMAC a club run by its members for its members