# Stall Warning

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#### John Pulis

##### New Member
I am looking for a generic stall warning for my home built. I have a vane from a Cherokee but it does not match the wing airfoil so it will be difficult to incorporate. Any suggestions?

JP
captjlp@gmail.com

#### Victor Bravo

##### Well-Known Member
He beat me to it

Although I will agree that there are probably SOME homebuilt airplanes where safety would benefit from a buzzer.

What type of homebuilt aircraft are you referring to specifically?

#### samyguy

##### Well-Known Member
build a lift reserve gauge for your aircraft

#### Dan Thomas

##### Well-Known Member
Any stall warning or lift reserve indicator (AoA indicator) will need calibrating, which means that test flights to determine the stall and subsequent adjustments to the switch vane or other pickup devices will be necessary.

So one needs to get the test flights done on a new homebuilt, and get comfortable flying it, before starting to explore the stall behavior if one hasn't done much of that before. An instructor aboard would be wise, or go get a bunch of stall/spin training. American students get little or no stall/spin training in the PPL and they shouldn't be fooling with it if they're not proficient. Canadians get much more of it, especially in the CPL training.

Stall warnings or AoA indicators won't save the pilot in some situations. The impulsive buzz job and hard pull-up is an classic way to get a vicious accelerated stall and spin into the ground. The warning stuff goes off right as things come apart. It's proof that too many pilots really don't understand AoA at all.

#### cluttonfred

##### Well-Known Member
HBA Supporter
A simple stall warning buzzer and light would be easy to cobble together using a limit switch, homemade vane, LED light, buzzer, push to test button, and a 9V battery.

https://www.kitplanes.com/build-your-own-stall-warning-device/

#### dmar836

##### Well-Known Member
I would be interested to know what type of homebuilt this is.
Dave

#### Rockiedog2

##### Well-Known Member
Smith Sidewinder
Profile page information
It’s a hot looking hi performance retract IIRC

#### Victor Bravo

##### Well-Known Member
OK, this is starting to make more sense for a Smyth Sidewinder than many other HBA's.

A very inexpensive stall warning indicator is a stall strip on the root leading edge of the wings, calibrated to separate the airflow at the root about 5-8 MPH before stall in 1G level flight.

You should hear and feel a strong buffet when it's set up right.

This has the added benefit of forcing the stall to begin at the root, adding a little safety.

The cost will be about 17 cents worth of aluminum and an hour of time, plus another two hours of "trial and error" testing.

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#### BJC

##### Well-Known Member
HBA Supporter
Does the Sidewinder have washout?

An option is to use small stall strips on the inboard wing. Properly placed, they initiate the stall inboard, which is generally desirable, but they also create turbulence that can be felt in the stick before the entire wing stalls.
OK, this is starting to make more sense for a Smyth Sidewinder than many other HBA's.

A very inexpensive stall warning indicator is a stall strip on the root leading edge of the wings, calibrated to separate the airflow at the root about 5-8 MPH before stsall in 1G level flight.

You should gear and feel a strong buffet when it's set up right.

This has the added benefit of forcing the stall to begin at the root, adding a little safety.

The cost will be about 17 cents worth of aluminum and an hour of time, plus another two hours of "trial and error" testing.
Yup.

BJC

#### Rockiedog2

##### Well-Known Member
The idea is to get at least a tickle of buffet across the horizontal/elevator. From flow separation over the wing root area

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#### Rockiedog2

##### Well-Known Member
You can trial error it with angle and duct tape then if you build it right permanent attach it in the right place with 3M double sided tape

#### Pops

##### Well-Known Member
HBA Supporter
Log Member
My Falconar F-12 had no stall warning at about 68 mph and the nose would drop down at about a 45 deg angle and would spin in either direction, to the downwind.
Always had to stop the spin. Then received a notice from the plans seller for a strongly recommended small stall strip on the leading edge about 2' out the wing from the fuselage sides. Then stalled like a Cherokee. Would have never believed the difference along with a nice prestall buffet. Different airplane.