lml@lancaironline.net Mailing List Archive

Hi Jay,

The light supplied by Lancair in the later kits mounts on the original nose gear fine. My kit was among the last few IV P’s which had the new heavier nose gear strut. The new strut is enough larger in diameter to prevent the nose gear doors from closing with the Lancair supplied light.

If you have the earlier nose gear strut I suggest you look into the original Lancair mounting set up.

Mine also came with the “Dolly Parton” cowl which has larger outlet area so the light in the right side cooling inlet does not seem to cause high cylinder temperatures in my case.

Jack Morgan

On Mar 11, 2014, at 6:01 AM, Lancair Mailing List <lml@lancaironline.net> wrote:

From: "Jay Phillips" <jayph@fastairplane.net>
Subject: IV-P Landing/Taxi Light Location
Date: March 10, 2014 at 7:31:25 AM EDT
To: lml@lancaironline.net

My IV-P has the landing/taxi light located in the right-hand cowling inlet.

Since I’ve owned the aircraft (2011) it’s been a challenge to manage the engine cooling during climb. My home field is at 5100’. I climb at 165 KIAS. By 13,000’ or so my hottest CHT is 400 dF and I have to reduce climb rate or level off for a few minutes to start the CHT’s back down. This situation occurs both winter and summer, although it is worse on a hot day.

While training with Bob Jeffrey recently, he suggested I try removing the landing light to see what effect that has on cooling. So I tried it yesterday and, apparently, problem solved. After takeoff I climbed at 165 KIAS all the way to 17,500’ and my hottest CHT only got as high as 392 dF. Indeed the CHTs had begun trending down.

So it seems that I need to find a new location to mount the landing/taxi light. The obvious location, that doesn’t involve cutting composite, is the nose gear. Can anyone who has a IV-P with a light mounted there provide guidance as to: type of light, mounting hardware, clearance issues, and anything else I should be aware of?

Thanks,

Jay Phillips