With the pitot tube assemblies out of stock, I was wondering if the integrated dual tube that Eagletree sells:


would work with the sensor(s) being recommended for the oilpan?

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Hi Mike, Eagletree's system uses a Prandtl tube which combines a Pitot tube and static port in one tube. Research it on Wikipedia or whatever and you tell us (DIY)! It shouldn't take more than 5 or 10 minutes.
My question related more to the aperture and tubing sizes, to be honest. If nobody's tried it, I'll give it a go...
Pressure is pressure and tubing is tubing. It doesn't really matter the source or size as long as Static is static and total is total. Personally I would just make your own out of pushrod straws or antenna tubes. It really isn't that scientific. For tube I use fuel tubing....

-Beall
O.K. Mike, I see you need some help. The oilpan only has an on board absolute pressure sensor (this means it's for altitude only). For airspeed you need differential pressure and the oilpan description in the store sez OPTIONAL (except in fine print, of course!). So now go look at the optional airspeed module and you'll see it has 2 tubes, 1 for Pitot pressure and 1 for static pressure, the sensor creates the differential pressure between the two for airspeed. The Eagletree setup has the Prandtl tube which has the Pitot pressure and static pressure in the same tube. So if the tube and tubing sizes are about the same in both units it should work pretty good. If not, you can adjust the connection tubing size or add an offset in the software.
Hi Ryan, static is static but pressure is not pressure. Think about a garden hose nozzle! Like they say, size matters!
John, sorry my original wording wasn't clearer. I was asking about compatibility between the Eagletree probe and the offboard airspeed sensor recommended for use with the oilpan, and (I thought obviously) about exactly the points that you haven't answered - namely, whether the tube/tubing sizes are compatible...

Ryan, tubing isn't tubing when it doesn't fit. 8)
I guess I never considered carying a garden hose in my airplane for my static lines maybe I should clarify to break the "common sense" brick wall. Hahaha.

As for specifics on OD and ID not a clue if they will fit. I'm pretty sure a garden hose will be too large but it is worth a shot if you have one laying around.

Just a side note: garden hose affect doesn't really apply because there is no mass flow. The continuity eqations are for mass flow not steady state zero velocity pressure.

mdot_in = mdot_out;
mdot = rho*area*vel;
Never say Never - It's not a closed system, there is mass flow every time the airspeed changes (which really is constantly)!
Hi Mike, I have both units and it looks like both are built from standard model airplane materials - 'small' (1/16" ID 1/8" OD) silicone fuel tubing and K&S aluminum or brass tubes 1/8" OD DIY & 3/32" OD EagleTree. They are close enough to be interchangeable, the tubing stretches easily. If you give it a try, let us know the results!
Mike, I just happened across my Eagletree paperwork and they actually spec the silicone tubing at 1.5mm/2.5mm ID/OD. Whatever........... Long live SAE!!!

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