Not published anywhere I can find. Anyone have any info on best glide speed and or glide ratio for a Navajo Cr? Seems like good info to have despite having two engines.

Yeah, not published anywhere...

IIRC it was about 120 or maybe 110 in the simulator at Simcom...but, it has been several years.

A lot of times, the speed is in the POH just not annotated as such. Look carefully through the emergency procedures. There may be an engines out procedure and I bet it has a recommended speed.

But yeah 110/120 sounds right.

I would dispute the idea that it's a useful number though.

Interesting. Why?

Interesting. Why?

Thanks for the replies. I suspected about 110/120. No idea what the glide ratio is. Not good I bet. I want to get a valid glide distance ring for ForeFlight. I know it’s unlikely, but what if there was an event that caused both engines to cease, incorrect fueling, fuel exhaustion, etc... admittedly I’m a low time multi engine guy, but I’m trying to learn the aircraft inside and out and know how to maximize my glide distance

Good impulse, wrong direction.

Gotcha. I mis-read it as 'the numbers are bogus'.

Coincidentally, I was looking at this earlier today for the 421...planning to fly a short stretch over water tomorrow (family on board).

Silly waste of time, I know.

But I have nothing better to do at the moment so I might as well plan for the 'inevitable heater fire', or dual engine failure, over the gulf.

Here's what's in the 421 POH...

Good impulse, wrong direction.[/quote]

Im not sure I understand what you mean. My impulse should be solely practicing single engine ops? Should I just start saying prayers if I lose both engines?

That sounds like a great idea, but there are just soooo many things to manage on a piston twin that focussing on a double engine failure is unrealistic.

Im not sure I understand what you mean. My impulse should be solely practicing single engine ops? Should I just start saying prayers if I lose both engines?[/quote]

Learning the machine in and out is important. But best glide speed is sort of like learning the skin thickness of every part of the plane. Not a useful detail.

Dual engine failures are just vanishingly rare. And glide speed only matters in rare circumstances. 600 AGL and JetA just destroyed both engines? doesn't matter. Over ocean? doesn't matter. Over the rockies? Doesn't matter. Over IMC and not near a runway? Doesn't really matter. Night? Probably won't matter. Over an interstate - or west texas? Doesn't matter. Do everything perfect and find the one flat piece of land within 30 nm ... but hit a ditch at 90 kts? Doesn't matter, still dead. Overshoot that one perfect field by 1/4 mile (because how much practice do you get at deadstick accuracy landings) - glide speed didn't matter.

The two navajo dual engine failures of which I'm aware both yielded 100% fatality rates neither of which would have been best changed by an emphasis on glide performance. One in Australia was over the ocean at night. The other was a low-time pilot who hadn't gotten a checkout and didn't switch fuel tanks after they ran dry.

There are lots of nitty gritty details to learn. The exact ins and outs of your avionics in normal operation. The common failure modes of all your systems. The exact normal operation of all your systems. And yes single engine ops - far far far far far more mishandled OEI than all DEI put together.

3rd one here in Canada last year: viewtopic.php?f=41&t=152073

2 "professional" pilots ran the tanks dry with 80 gallons on board. :/

Everyone survived but that's just blind luck...

Lesson: study the fuel system more

According to the Standard Catalog of Piper Twin Engine Aircraft, sanctioned and co-written by the principles of Piper Aircraft Corporation...

-- Best Glide reflects S/E ROC for the C/R.

For the 1974-1979 Piper Navajo 325 C/R:

This manual lists: "Best Glide" = 97 Knots

It is a little different for every Navajo model.

~ ME