Search found 211 matches

by Dave Hayfield
October 18th, 2016, 11:47 pm
Forum: General Discussion Topics
Topic: Use of our website
Replies: 23
Views: 4279

Use of our website

The LMA website does not seem to be getting the usage that other association sites attract considering the hundreds of members in the association. Not many discussions about the hobby, the equipment we use, experiences we come up with etc. etc. I go on to other forums and they are full of various co...
by Dave Hayfield
July 14th, 2016, 11:07 pm
Forum: General Discussion Topics
Topic: ADDITIONAL ENGINE FAILSAFE
Replies: 0
Views: 547

ADDITIONAL ENGINE FAILSAFE

I have put an item in 'Electric Stuff' on our website but to bring it to a wider readership I thought that if it was on this category I would get more feedback; The CAA requirement laid down in Article242 Air Navigation Order 2009 states that; (i) Any aircraft with a mass of more than 7Kg must be eq...
by Dave Hayfield
June 19th, 2016, 6:35 pm
Forum: The Old Forum Lounge
Topic: Aviation humour
Replies: 1
Views: 1063

Re: Aviation humour

Was looking along the shelves of the Royal Navy bookshop at the naval base at Portsmouth. One shelf had a row of about 12 volumes of Anecdotes and Jokes from the Royal Navy. At the very end of the row was a book entitled Anecdotes and Jokes from the Royal Air Force. I looked through some of the Navy...
by Dave Hayfield
May 22nd, 2016, 9:23 pm
Forum: Electric Stuff
Topic: BACKUP ENGINE FAILSAFE
Replies: 3
Views: 1631

Re: BACKUP ENGINE FAILSAFE

Hi Steve, there is usually a capacitor in the RX that will deal with this, never the less a protection diode will not go amiss. Thanks for the suggestion so have added it to the diagram, also an extra protection diode to safeguard the RX if wrong polarity is applied.
by Dave Hayfield
May 22nd, 2016, 3:07 pm
Forum: Electric Stuff
Topic: BACKUP ENGINE FAILSAFE
Replies: 3
Views: 1631

BACKUP ENGINE FAILSAFE

The failsafe system that we use on our models is not 100% reliable. If the voltage supply to the receiver is lost then failsafe will not occur because it needs the working RX to set controls to preselected positions. If power is lost to the RX through any reason, broken connections, faulty cell, on/...
by Dave Hayfield
May 9th, 2016, 5:36 pm
Forum: General Discussion Topics
Topic: Ivan Goodchild
Replies: 9
Views: 2127

Re: Ivan Goodchild

Very sad news, you could not meet a nicer person and his value to the LMA with his knowledge of electronics has been invaluable. We will miss you...............Dave and Greg
by Dave Hayfield
April 27th, 2016, 9:45 am
Forum: General Discussion Topics
Topic: What is it?
Replies: 3
Views: 1137

What is it?

Can someone identify the twin engined canard U-0244 shown as one of the featured pics on the homepage.
by Dave Hayfield
April 17th, 2016, 6:05 pm
Forum: General Discussion Topics
Topic: Batteries
Replies: 35
Views: 6194

Re: Batteries

Just in case you have a Maplin store near you they have a Scottky diode ....3 amp rated with 80 amp surge which will do the job for you.....stock number N91CA at 36 pence. Sorry about the no stock at CPC...they didn't tell me !!!
by Dave Hayfield
April 15th, 2016, 10:10 pm
Forum: General Discussion Topics
Topic: Batteries
Replies: 35
Views: 6194

Re: Batteries

Hi Edgar, Google CPC who are a components supplier who you can order from on line. There will be quite a selection of diodes so you will have to select according to your reuirements.
by Dave Hayfield
April 15th, 2016, 12:45 pm
Forum: General Discussion Topics
Topic: Batteries
Replies: 35
Views: 6194

Re: Batteries

by Dave Hayfield
April 14th, 2016, 10:13 am
Forum: General Discussion Topics
Topic: Batteries
Replies: 35
Views: 6194

Re: Batteries

Hi Tony, put it like this....if you have two jars of the same capacity, ie. the same voltage capacity, one full of water and the other empty and then put a tube to syphon water from one to the other. Nothing will happen even though they are both of the same capacity. What will get things moving is t...
by Dave Hayfield
April 13th, 2016, 10:28 pm
Forum: General Discussion Topics
Topic: Batteries
Replies: 35
Views: 6194

Re: Batteries

Hi Tony, if you use Ohms Law to explain this quandary your facts do not compute. V=IR where V is the voltage, I is the current and R is the resistance. The nominal voltage levels of each battery are the same so there will be no or insignificant little current flow presuming the internal resistance o...
by Dave Hayfield
April 13th, 2016, 12:45 pm
Forum: General Discussion Topics
Topic: Batteries
Replies: 35
Views: 6194

Re: Batteries

Rob, the reason there is only a small current flow when a flat battery is paralled with a fully charged one of the same type is that there must be a significantly higher voltage applied to any battery to charge it. In this particular case the flat battery is only capable of responding to its nominal...
by Dave Hayfield
April 1st, 2016, 12:49 pm
Forum: General Discussion Topics
Topic: Occasional flying sites for LMA members
Replies: 0
Views: 578

Occasional flying sites for LMA members

Just seen an advert for a vintage vehicle and aircraft event at what was RAF Bicester near Oxford. The airfield is now owned by these enthusiasts and is also used by the local gliding club. I don't live near this airfield but if any LMA members do it may be worth making enquiries to see if they woul...
by Dave Hayfield
March 3rd, 2016, 12:12 am
Forum: Technical Help required
Topic: Tygon alternative
Replies: 13
Views: 1659

Re: Tygon alternative

Lots of it in large quantities on ebay
by Dave Hayfield
March 3rd, 2016, 12:10 am
Forum: General Discussion Topics
Topic: TSR 2
Replies: 11
Views: 2792

Re: TSR 2

Whilst on the subject of government decisions, who thinks the right decision was made to axe the Harriers and sell all of our remaining ones to the American Navy so that they could keep their Sea Harriers flying till 2035. The replacement STOVL aircraft on our new carriers is supposed to be the F35B...
by Dave Hayfield
January 25th, 2016, 11:40 pm
Forum: Electric Stuff
Topic: 12v STARTER BATTERY
Replies: 2
Views: 1341

Re: 12v STARTER BATTERY

I use a Just Engines heavy duty starter on 24 volts (2x 10amp hour, 12 volt) to start Zen 62's. This starter is ok on 12 volts for smaller engines so depending what you are starting 13.2volts shouldn't be a problem.
by Dave Hayfield
January 17th, 2016, 11:59 pm
Forum: General Discussion Topics
Topic: nuisance phone calls
Replies: 3
Views: 1209

Re: nuisance phone calls

I know that I shouldn't encourage this naughtiness but sometimes you have to play along with scammers. I have had several calls from someone with an indian accent telling me that they are from microsoft and that I have terrible things in my computer that need to be removed. Feeling rather playful on...
by Dave Hayfield
December 16th, 2015, 1:55 pm
Forum: General Discussion Topics
Topic: Drones & Model Aircraft in the USA.
Replies: 8
Views: 1895

Re: Drones & Model Aircraft in the USA.

Nasty incident reported on the news a few days ago where a child lost the sight in one eye due to being struck by a small quadcoptor. The people who fly these toys have no idea of rules and regulations to do with flying models and will continue in complete ignorance. Hopefully the repercussions will...
by Dave Hayfield
December 11th, 2015, 10:02 pm
Forum: Electric Stuff
Topic: Diodes in twin battery set ups
Replies: 12
Views: 6349

Re: Diodes in twin battery set ups

With over 20kg models it is mandatory to have two separate radio systems. This means two batteries powering two systems. If one battery fails or anything else in the system stops working, the model is still safe and operable on the remaining receiver. If you know your model, and you should, you will...

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