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DIY manometer to check your ASI

 
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Aero Siam



Joined: 30 Jan 2006
Posts: 16
Location: Thailand

PostPosted: Sun Jan 03, 2021 12:49 am    Post subject: DIY manometer to check your ASI Reply with quote

The link below gives instruction to build a manometer. This article appeared in EAA Sport Aviation in August 2006.

http://www.iflyez.com/manometer.shtml

The manometer allows you to check your CAS and correct the IAS readings. That only leaves position error.

The author suggests blowing into the inlet tube. I suggest a 20cc syringe which is much more controllable. You can use 2 hands (butting against each other) to ensure the plunger can not slip and over-pressure the system.

The factory-installed ASI was quite inaccurate - underreading at low and overreading at high speeds. I recalibrated it to make it both read accurately and to read in knots instead of mph.

From memory, there are 3 plates with screws inside the ASI. The high speed plate is easy to set but any alteration to the low speed plate affects the speeds up the scale as the plates impinge on each other.

I bought a second ASI for redundancy. It overread at approach speeds by 5 knots which was unsafe and needed to be recalibrated. I later added a Dynon. To minimise position error, I set the Dynon pitot at minus 5 degrees to give accurate readings at high angles of attack. This is helped by the conical design of the pitot tube.

At half flap with the stall warning on and level flight, the Dynon reads 38 kts and the ASI 30.
At full flap, Dynon is 32 and ASI 20. At speeds above 45, all 3 read accurately. This plane is fitted with vortex generators which lowered the stall speed and also improved the slow speed handling.


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haroldhooverrr



Joined: 02 Dec 2020
Posts: 8

PostPosted: Thu Jul 15, 2021 7:56 am    Post subject: Re: DIY manometer to check your ASI Reply with quote

A medical residency personal statements portfolio is necessary, first of all, for those who are going to enter the magistracy. And maybe for graduate school - if you are studying for a specialty, or if you are already a master's degree. If, upon admission to the master's program, the portfolio will bring only additional points, then it is definitely impossible to get into graduate school without a good portfolio.

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