Airspeed indicator Alarm

[Bennie Vorster]

How will I be able to install a low airspeed alarm in my plane? It is stalling at aboute 58 mph, thus I would like having a buzzer of some kind to be set say at 60 or 65 mph.

[Arnulf]

low airspeed alarm

stall warning

[Bennie Vorster]

low airspeed alarm

stall warning

Yip, how do I get that? cheap, cheap.
Does the Fly dat instruments have something like an airspeed indicator with an buildin alarm funktion?

[Arnulf]

Built in alarm function is a bit dodgy, because your aerie can stall at any speed. You want a stall warning!

[Bennie Vorster]

your aerie can stall at any speed.

You are confusing me now, how you do that.

[Bennie Vorster]

Some thing like this.



The SW2.2 Stall Warning system is a simple electrical device that gives a clear sounding alarm if the aircraft flies slower than 1.1 times the stalling speed of the moment. This may be adusted to any other value during flight tests. The Aeromax SW2.2 is not certified. It is designed for experimental, homebuilt, ultralight aircraft and gliders, flying in non-icing conditions. Because the system feels the pressure around the wing, the stall warning adjusts automatically to position of flaps.

Features: Accurate threshold of operation, No mechanical parts protruding from the wing; no ground handling hazard, Automatically adjusts to the position of the flaps, Loud buzzer, audible even with headsets, Mechanically adjustable buzzer volume, Test button on instrument panel for control of battery and buzzer, Completely independent of the aircrafts electrical circuit, Mini lithium battery with a 5-yr. life, No electronics, No ON/OFF switch; system is always ready, No interface with audio sys. of the aircraft, Weight (incl. cables & battery): 11oz., Suitable for all aircraft with stall speed of 30 knots or more.

[Arnulf]

You are confusing me now, how you do that.

O.k. Bennie, its going to be a bit longwinded if I explain it to you here. We could discuss this over a case of beer. Better is if you ask your local instructor to explain it to you. Problem is not really your speed, but your angle of attack that stalls your aircraft. But I see you are on the right track.

Regards,
Arnulf

[KFA]

Bennie gaan kyk by www.aircraftspruce.com onder instruments / stall warning systems

[Thunderboy]

Bennie are you looking at one for the trike or BB

If a BB is like a TB the indicated air speed you stall at changes depending on what flap setting you on.
Eg the TB stalls at 40 mph no flap, 35 mph 1 flap, 30 mph 2 flap and only 25 mph on 3 flap although it is not actually the speed but angle of attack as Arnulf says. If you have a skydat system on the BB you can set it to give a warning at a certain speed but this would be for a speed you set, not neccesarily a stall...

Hope I have not confused you more......

[Aerosan]

Bennie, take a piece of wool and then tie it to say the strut on your wing. Out of the prop whash of course. Now watch this piece of wool (you will have to get the lenth right) if it isnt flying straight and looks rather "pap" you are stalling.

[Duck Rogers]

..... and looks rather "pap" you are stalling

There's a couple of us on this forum that's continually in a stall

[Aerosan]

Yes Duck we know ...we know..... speaking about pap hows your back told you that Superman suit was a bad idea....

[Morph]

Bennie,

your BB is an enclosed 3-axis. Here you have to watch the ASI religiously particularly on takeoff and landing. I know trikes rely on the feeling in the face and stuff, here you are cut off from the wind. Once you are used to focusing on the ASI a stall warning is no longer necessary

[DarkHelmet]

What is an ASI?

What morph says is so true... The "feeder pipe" on the ASI on my trike came loose after take off on a corrugated gravel road. I did not notice my ASI not working until well after take-off - I went oh - cods twallop and just flew the aerie!

My conversion onto the challenger showed me how important that little dial is!

[Bennie Vorster]

Bennie,

your BB is an enclosed 3-axis. Here you have to watch the ASI religiously particularly on takeoff and landing. I know trikes rely on the feeling in the face and stuff, here you are cut off from the wind. Once you are used to focusing on the ASI a stall warning is no longer necessary

My problem is that I'm so focused on the instruments that I can't enjoy the scenery. I'm too scared I might go into a stall. further more I'm not using my flapperons on my BB at all coz the nose is a bit heavy with the VW motor in it. Thus I do not have that mush different stall speeds and an simple low airspeed alarm will be significant.