wiring hobbs hour meter

[n85ae]

Pick a low oil pressure switch for pretty much any older model car, and
get the sending unit from the auto parts. They are almost all 1/8 npt. Then just
use a tee fitting with your oil pressure sender. Have it toggle your hobbes
on when the engine starts. I run mine to a relay that flip flops, and turns
on an idiot light if master is on and oil pressure is zero, or hobbes on when
master is on and oil pressure is > 5 psi

summitracing.com has them

http://www.summitracing.com/parts/sum-g1438/overview/

Regards,
Jeff Hays

[Dave S]

Patrick,

Many ways to accomplish this........to some extent, it depends on what other equipment a person has on the panel.

Please check the attached photo. In this case, the UMA electronic tachometer just below the Quad gauge (conveniently labeled for a 912) has a hobbs tap on the back.(hobbs just below the tach) ......when the engine is not running, no signal is produced and the hobbs stops.

Maybe I ran across a few too many rental planes which had battery powered hobbs meters which would just keep on running till the battery died if a careless renter happened to have left the master on...then I would have to get both the hours straightened out as well as the dead battery before I could use the plane in the morning. (admittedly not so much a problem with owner operated planes)

However, the Hobbs tagged onto the UMA tachometer (if a person happens to have this tachometer) is a pretty simple system and effective.

Sincerely

Dave S
KF7 Trigear
912ULS Warp Drive

St Paul, MN

[colospace]

Unrelated to original question, but Dave, I was wondering about what appears to be a small window in your left boot cowl adjacent to your left foot.

[Dave S]

Hi Gary,

The window you are looking at in the photo is a cutout for the pilot's side air vent...that was just after my first flight after deciding that flying a Kitfox without air vents and without a heater shutoff valve in 85 degree F. weather would be more comfortable with some fresh air..... At that point the vent was not installed yet. I fabricated one for each side....sort of RV style installed in the high pressure area on each side of the cowl and so the pilot and copilot can easily reach their respective air vents for adjustment.

If you do a thread search on Teamkitfox for cowl vents, you can find photos of this completed installation as well as vent installations of other builders.

Dorsal started a thread titled "Thoughts on cabin ventilation" back a while....several photos and discussion there.

Sincerely,

Dave S