ez-hook nose

[fastlammy]

Can any one tell me the purpose of cup in the nose in the front of the ex-hook stream liner

[Glen]

That is the air intake for the rider and air to the engine.

[panic]

Any info on how the size was selected?
Obviously, enough area for 355 is too small for 200, etc.

[Glen]

google the easyhook web site

[stwheeler]

http://www.streamliner.com/

[fredvance]

Is Sam going to be at Cooks Shootout this year?

[stwheeler]

He is shooting for it.

[John Burk]

An inlet at the static pressure area doesn't need to be sized like a scoop but 100% pressure is in a fairly small area so oversize means less pressure .

[Jon]

Lots of interesting NACA research in "nose nozzles", worth a google, a lot better pressure recovery than NACA ducts, the hard bit is getting the air from there to where you want to use it efficiently.

Sizing is not as critical as you would think if the rim is of decent design.

Cheers
jon

[Dean Los Angeles]

The nose is an excellent place to pull air. It's too far from anyplace to be useful unless it's on a motorcycle fairing.  Conductance losses in the long ducting to the engine on a streamliner would make the NACA duct or a ram air duct closer to the engine a better choice.

[sockjohn]

The nose is an excellent place to pull air. It's too far from anyplace to be useful unless it's on a motorcycle fairing.  Conductance losses in the long ducting to the engine on a streamliner would make the NACA duct or a ram air duct closer to the engine a better choice.

Would make sense on a front wheel drive car too.

I know there was a front wheel drive lakester running around 2007 or so, but for the life of me can't remember whose car it was.  I don't recall the details of the air inlet, but will look to see if I have a picture of it.

[PorkPie]

George Johnson - Saltosaurus

[wickedwagens]

The nose is an excellent place to pull air. It's too far from anyplace to be useful unless it's on a motorcycle fairing.  Conductance losses in the long ducting to the engine on a streamliner would make the NACA duct or a ram air duct closer to the engine a better choice.

Would make sense on a front wheel drive car too.

I know there was a front wheel drive lakester running around 2007 or so, but for the life of me can't remember whose car it was.  I don't recall the details of the air inlet, but will look to see if I have a picture of it.

Not just front wheel drive but anything front engine.

[gidge348]

Just thinking of this a different way but I’m probably on a totally incorrect line (please let me know).

What if the duct taken from the stagnation point has nothing to do with "supercharging” the engine, but has to do with reducing effective total frontal area?

Say the duct represents 20% of the total frontal area.

The air at the duct is getting sucked in at say 300mph and the vehicle is traveling at say 300 mph so efectively duct is sucking a vacume equivelent to 20% of the frontal area.

I guess this is kind of like the early jet fighters of the 1950’s (F86 Sabre/Mig 15 etc.).

I believe that the main reason for the change in inlet ducts on modern jets is that as speeds began to rise closer to mach 1 air flow though the engines became a problem.

Another analogy would be pushing a piece of pipe through water, say both ends are open so it pushes through with little resistance. Now block the ends and resistance from the created stagnation point is conciderable.

Any thoughts?

Ian...       

[Rex Schimmer]

First the air going into the inlet is not sucked in at 300 mph, it is pushed in by the forward speed of the bike, in this case, and you now have air at 300 mph that is going through an inlet tract that may not be smooth so it is probably turbulent and very likely un-attached so therefore high drag. Nothing is free, in your pipe example if you push the pipe through the water slowly then the drag is only related to the "frontal area" of the pipe as the flow through the pipe is laminar, but as you go faster such that the Reynolds number exceeds approx 5000 (I think, it might be higher) the flow becomes turbulent and the drag increases considerably with speed.

Rex