Hi Carl. Long time no see.
The trim set up determines the airspeed. The trim motor arm extends with a
tiny magnet fixed to it which operates the proximity switch. Finding the co
rrect combination of switch and magnet to give a precise reliable switch wa
s a significant part of the development, which took nearly a year.
Cheers. Bryan
From: carl@flyers.freeserve.co.ukTo: europa-list@matronics.comSubject: Re:
Europa-List: Wheels up WarnerDate: Sun, 8 Jun 2008 20:51:01 +0100
Sounds like a great idea Bryan.
I had always wanted to fit something similar but just havent had the time t
o think it through - or get round to doing it.
I guess when it happens to you then it focuses the mind.
I would be interested in the details.
BTW how does the system recognise the aircraft is below 65 knots - ie: wher
e is the input taken from?
Carl
G-LABS
----- Original Message -----
From: Bryan Allsop
Sent: Sunday, June 08, 2008 7:15 PM
Subject: Europa-List: Wheels up Warner
Hi all Fellow Mono Pilots, It seems strange that I was showing my wheels up
warning device to Bob Hitchcock last weekend. He was saying that other peo
ple could be interested , but I was not so sure. It seems that I may have b
een wrong! I have developed a simple processor to control the system. With
the trim set to less than 65 Knots for landing, a proximity switch puts a +
ve signal to the controller. With the wheel up a bright red led flashes. Af
ter 30 seconds of no further action a very loud intermitent siren makes its
elf known. Normally you will have the wheel down within the 30 seconds, so
that the siren does not come on. The siren can be temporarily overidden if
required. When the wheel is down and locked, a bright green led comes on, a
nd the red flasher goes off. Having had my own wheels up experience I have
no intentions of having another one. It works well, but installation requi
res a bit of patience to get it set up for the 65 knot speed. It weighs a f
ew ounces, and you need about 6 cubic inches of space behind the panel. I h
ave no ambitions to start large scale marketing of it, but if sufficient pe
ople were to be interested I do have the resources to knock out some kits.
There are no approvals on the device, I don't even know if it needs one sin
ce it is not attached to any part of the controls. Regards to all. Bryan
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