Type07 FWE

[Nick]

Hi all,

attached pic is the Type 07 as designed by Graham using U flow to optimise the design. Well find out in the next day or two more about its running characteristics.

Nick

[Mike Everman]

Yeah, baby, yeah! That's what I was looking to see! Looks good, Nick. Nice build.

[mk]

Very nice workmanship!

Please keep us informed what you're "running in" with the engine.

[Eric]

Hope it works well for you. Did steve have any involvement with the project?

Eric

[Dave]

Nick
It looks great. Looking forward to hearing about how she runs.
Dave

[Nick]

Hope it works well for you. Did steve have any involvement with the project?

Eric

not at this stage, no. But we have used to FWE as a bench mark, then using what Graham has learned about U Flow we can make alterations/enhancements to the design on U Flow then build and test them. This way we can ratify the system Graham has developed, if this iteration goes well we can test its thrust agains that of the std FWE i built earlier and see what if any improvement has been made. the model says it will improve but as always there's nothing quite like hard imperical data.

Test goes ahead this morning!.

Fingers crossed.

Nick

[Bruno Ogorelec]

Did steve have any involvement with the project?

Ha-ha-ha... exactly what came to my mind, too -- but for a different reason. Though, shouldn't a Steve kind of a plug be portlier? This one is awfully long and spindly...

[Nick]

Ok heres the film of todays test, i cant do it for long as its Very loud.
Unfortunately not a completely sucessfull run, but its close, probably needs some length taken off the intake.
But not today. :oops:

Nick

[Graham C. Williams]

Dear Nick.
Great, I love the exhaust massflow. The video puts me in mind of one of Mike’s tests (with Bill I think). So perhaps after the induction length tests we should try to reduce the induction pipe diameter from 17mm to 15mm. Or, do a Mike Everman and squash it a little. Your thoughts Mike or Bill.
Graham.

[Dave]

Nick
Love the video, especially watching the engine mount flex when she fires!
Dave

[Nick]

After some adjustments- Houston we have LIFT OFF!.

Sucessful run film attached, pics of thrust measurement device to follow.

On this run it pulled 550ml of water, unaugmented and against the friction and inertia of the device itself, i have yet to find out how much 550ml of water is im sure someone can tell me.

Enjoy

Nick

[Nick]

Here is the thrust measuring device pic
Nick

[Graham C. Williams]

Oh. Nick.
You are the man.
That is great.

Graham.

[larry cottrill]

Nick -

I wish somebody would try my "variable displacement" thrust dingbat, which would only be modification of what you show. Here's how it would be done:

Use a hollow cylinder that just sinks in water - say one of the really big CO2 cylinders with enough added ballast to make it neutrally bouyant or just slightly sinking. You'd also need a deep bucket of water, of course. Suspend the cylinder from your cable by threading an appropriate fitting in the neck. Glue a waterproof ruler to the cylinder's side, like a section of steel measuring tape, and calibrate it on a chart using various weights pulling it up out of the water via a pulley. The greater the force, the higher it will rise above the water's surface [which will drop slightly as the displacement is reduced - that's why you want the scale ON the cylinder!].

This is only a little more work than what you have, and once calibrated would give you instantaneous readings at any power level. You should also raise your pulley if possible so that the upper part of the cable is pulled truly horizontally, for good linearity.

Very nice build of this engine, Nick! It will be fun to learn what this does to the thrust, as well as to the observable heating pattern along the pipe.

Great work, as always!

L Cottrill

[Nick]

Thrust measurement, Hi larry good idea, Ill look around for some suitable doner devices/objects.

In the mean time the thrust at the last run is coming aout at 1.2125lbs , that is plus the wieght of the bucket and string and without redirecting the front thrust which is fairly considerable.

The other thing is i dont know if the last run was at full throttle but that wil have to wait, still all in all i dont thing thats bad for an intake dia of only 15mm!.

If i can find my wifes kitchen scales i will see how much to add to the above figure.

Cheers all

Nick