Lift reserve Indicator, but DIGITAL...have you seen one?

[prporter]

I want to put an LRI on my panel, but would prefer a digital one... has anyone seen one?

[hevansrv7a]

When I chose the LRI I had this in mind which I offer for your consideration:

• totally independent of electrics
• if mounted far upper left, can be accurately perceived with peripheral vision while looking outside which is where you should be looking when you are on approach and landing
• less to go wrong
• analog is provably easier to interpret for us mere humans

So, now you have the opposing view and - the wonderful part - can do what you want to do.

[prporter]

Awhile back, I had seen a digital unit that moved in an arc like the analog one, but was done with LED's in a circle.

[Scud]

Here's a company that sells one with LEDs. No prices listed. http://www.lriaoa.com/kits.htm

[praterdj]

What is and LRI? Is it similar to AOA? Probably a stupid question but I'm trying to learn.

[RV_7A]

LRI- Lift Reserve Indicator

http://www.liftreserve.com/

Very very nice instrument.

-Jeff

[praterdj]

Thanks Jeff. I checked the website. Might have to add that to the list. Would this be necessary if I were planning on an AOA or would it just be redundant?

[RV_7A]

That would be redundant. Im installing one in my plane. Its on my list as well.

-Jeff

[Ted Radclyffe]

Originally Posted by Scud

Here's a company that sells one with LEDs. No prices listed. http://www.lriaoa.com/kits.htm

I have installed one of the circular kits but have not had a chance to test it yet. 'Rough Red' (VH-ITR) is about to have the wings finally grafted on.

My observations are that the advantage of the circular indicator is that it fits exactly in the standard small instrument hole. The mechanical unit is a tad bigger. It catches the eye really well and goes dormant when there is maximum lift reserve (Cruise).
The LEDs are dimmable and have a sensor which automatically dims them to a predetermined level when the ambient light level falls.
On the unit I received, the warning sound (Required in Aust for IFR) is internal and is not able to be fed to the intercom. It is however quite loud. It can be switched off for aero's and there is a indicator LED to indicate that the warning has been disabled.

Fitting of the instrument is easy being mostly mechanical tubing and pipe work. There is a box to mount and the indicator is connected to the box with a meter or so of cable. I re-terminated the cable to get rid of all the additional wire but the intention is that the box which has the hose fittings can be mounted in any convenient spot and the indicator is mounted in the instrument panel.

I mounted the wing probossus in the aeleron bell crank cover near the pitot pipe. Taking off the fuel tank to 'P' clamp the tubes to the spar was a drag but if one didn't care so much they can be simply poked in the space between the spar and the tank.

Setup is a breeze with a protractor being provided to get the correct angle. Fine adjustment can be done at the instrument.

My observation is that the whole instrument is well constructed for the price, fits into the panel well, and is easy to see and interpret.

Next month when 'Rough Red' finally takes to the air, we will know if the choice was vindicated.

Hope this helps a bit with the choice.

Ted

[prporter]

Ted, did you install the circular LED or circular mechanical?