Replacing an airspeed indicator

"Soartech" wrote in message
...
K, none of those Winters, in either size, are 0 to 120 knots which is what
I need.
I was looking at this one as best available. Low price, easy to read.
Does anyone have any comments on this brand, other than the fact that
there is no such measurement as KPH?
http://www.aircraftspruce.com/catalo...p-10-05383.php


KPH is kilometers per hour. 120 KPH equals 65 Knots, unsuitable for your
use. Try this one instead:

http://www.aircraftspruce.com/catalo...nasi120n-3.php

On Friday, March 7, 2014 12:43:14 PM UTC-6, Soartech wrote:
Seriously, none of the Winter ASIs come with 0 to 120 knot scales. In fact this is one of few ASIs that does. It seems very easy to read and the price is good. Does anyone have any comments on the brand (Skysports)? http://www.aircraftspruce.com/catalo...p-10-05384.php

Just a bit of advice. Do NOT get an airspeed indicator that has its max range limit at your plane's redline. Why? Do you really know if you are at redline or maybe 20 knots past it if your indicator hits a stop (either visible or not) at your indicated redline?

http://www.ntsb.gov/aviationquery/br...30X01573&key=1

Willing to gamble your life on a couple of hundred dollars?

As UH says, FWIW.

Steve

who knows, this glider may go to 160kts, but do I really need to go that fast?

YES!

On Friday, March 7, 2014 11:41:38 AM UTC-7, Brad wrote:
dunno, not smart enough to know all them fancy wurds



Brad

LOL!

On Friday, March 7, 2014 11:33:00 AM UTC-8, mike wrote:
On Friday, March 7, 2014 11:41:38 AM UTC-7, Brad wrote:

dunno, not smart enough to know all them fancy wurds







Brad



LOL!

agreed!

last year we towed the Tetra15 out to a mountain airstrip to do some late fall flying. On the way back my buddy flying the Colt towplane had it firewalled and I caught up and passed him. The air was smooth a silk and I was going as fast as I had ever gone in the ship............it was a great opportunity to expand the speed envelope. We have all the control surfaces mass balanced and the ship is incredibly torsionally stiff.........bet it would go faster....game on!

On 3/7/2014 12:17 PM, Steve Leonard wrote:
Snip...
Just a bit of advice. Do NOT get an airspeed indicator that has its max
range limit at your plane's redline. Why? Do you really know if you are
at redline or maybe 20 knots past it if your indicator hits a stop (either
visible or not) at your indicated redline?

http://www.ntsb.gov/aviationquery/br...30X01573&key=1

Willing to gamble your life on a couple of hundred dollars?

As UH says, FWIW.

Steve


Dsve Lawrence (PIC in the aforenoted NTSB report) wrote up the accident for
AW&ST (Aviation Week & Space Technology) and Soaring magazine (online archive
available). I know and have soared with Dave (former Libelle/ASW-20 owner),
and shared more than one post-camp-flight B.S. session with him. Good
pilot/person/guy. He has an extensive background in (manned and unmanned)
flight test, flown military aircraft, and IMO is very much a 'switched on'
pilot, with no obvious "I am God-personified" in his pilot attitude that I
ever sensed. Yet he was fortunate to not lose his life in this 'he screwed up'
accident. Human perfection isn't an option...

Also, "What Steve L. said."

Also also, FWIW...

Bob W.

Originally Posted by Soartech

K, none of those Winters, in either size, are 0 to 120 knots which is what I need.
I was looking at this one as best available. Low price, easy to read.
Does anyone have any comments on this brand, other than the fact that there is no such measurement as KPH?
http://www.aircraftspruce.com/catalo...p-10-05383.php

Um, kilometers per hour?

Is there any reason to suspect that an ASI (especially a non-TSO'ed one) might be more accurate in the middle of it's range?

Also, to anyone with a combo vario/secondary ASI like LXNAV V7, does the AS indicated on the V7 agree with your primary ASI and if not, which one do you trust? A sanity check on the primary ASI with a secondary instrument seems like such a good idea to me. I mean... when my ASI eventually goes broken, I want to know right away. The redundancy is nice in the meantime, especially if they agree on speed.

On Friday, March 7, 2014 2:17:45 PM UTC-5, Steve Leonard wrote:
On Friday, March 7, 2014 12:43:14 PM UTC-6, Soartech wrote:

Seriously, none of the Winter ASIs come with 0 to 120 knot scales. In fact this is one of few ASIs that does. It seems very easy to read and the price is good. Does anyone have any comments on the brand (Skysports)? http://www.aircraftspruce.com/catalo...p-10-05384.php



Just a bit of advice. Do NOT get an airspeed indicator that has its max range limit at your plane's redline. Why? Do you really know if you are at redline or maybe 20 knots past it if your indicator hits a stop (either visible or not) at your indicated redline?



http://www.ntsb.gov/aviationquery/br...30X01573&key=1



Willing to gamble your life on a couple of hundred dollars?



As UH says, FWIW.



Steve

Are you kidding me? I think anyone can tell when going 100 knots or 20 knots.
Slow down! Who wants to go over 100 knots? Not me.
I have no idea what FWIW means, nor do I care. YIMMV

On Friday, March 7, 2014 2:45:53 PM UTC-7, son_of_flubber wrote:

Also, to anyone with a combo vario/secondary ASI like LXNAV V7, does the AS indicated on the V7 agree with your primary ASI and if not, which one do you trust? .......
Son,
You have to remember that your ASI shows IAS and the V7 shows TAS. Typically these are always different (With a larger difference at higher altitudes and hotter than standard atmosphere). I trust either one but of course you use IAS for things like flap speeds and approach speeds.