my VTOL design

[uriah]

My VTOL design is quite simple... You have a horizontal fan and a verticle fan. The horizontal EDF's airstream splits in two and can be vectored accordingly with turning on the lift fan...

:o I HOPE IT WORKS....

-uRIAH n. gEORGE

[rdresch]

I'd like to see more. I see the horizontal fan and vector vanes. How does the vertical lift fan fit in. Is there a second fan?
Rudy

[uriah]

yeah there is a second fan... think of my set up like a mix between the F/A-22 and the F-35 JSF

in the picture below is shown the basics of what i'm gonna do. if Lockheed Martin made it work I think I can make this idea work as I'll be dealing with a much smaller scale.

note: the ground in the picture below is shown in Thermal vision showing the plane's heat "footprint" during a VTOL opperation. you will notice the lifting fan is putting out little to no heat. that is because it is designed so the horizontal engine (which must be some kind of hybrid turbojet/ turbo prop) can turn the lift fan by means of a clutch, like from a car...

-uriah

[uriah]

I was thinking I might need a gyro to sense roll and pitch. i.e. If the nose rises too far, then the lifting fan's rmps are lowered untill the plane is level. with roll it is much more difficult. if the plane starts to roll the only thing able to stop this are the vectoring nozzles. by pointing the one opposite the direction of the roll to the rear instead of down the one on the side of the direction of the roll will be the only one pushing down, in turn rolling the other way, untill correct. but there is a problem here. when one nozzle's flow is directed back horizontally and the other is down there will be a thrust forward, a roll to the side of the one pointed rear, and a turn in direction towards the side of the downward pointed nozzle. so this won't work for VTOL. in flight the vectoring can be used to control nearly all manouvering, but during VTOL it just won't work.... any suggestions???

[Tuner]

Id love to see it. Keep it up!

[Lewist]

Uriah

You are going to need gyros for pitch roll and yaw.

My suggestion for the contolls are as follows.

pitch - vary rpm of the front and rear fans
yaw - a vein under the front fan used to direct airflow
roll - this is tricky. with the two sets of nozzles close together i doubt that there will be enough differential to actually controll the roll.

I have been thinking about this (i got my hover test platform to work, but i would like to try and make a scale vtol) and i reacon that a b/l EDF40 might be the ticket here. It could have a duct that splits in two and these ducts are rougted through the wings to the tips (or near). at the spit in the duct a diverter slide could be used to then vary the flow to each nozzle, just like the real thing!

I know there would be a lot of duct losses but i do think that it is possible to make it happen.

[uriah]

hmm.... that sounds about correct. i'm working with a profeshional, so I think i'll be able to figure out something...

were can I buy electric gyros and learn how they work???

[rdresch]

I would test the lift of your fans and duct arrangement before I spent money on gyros etc. Ducted fans are the least efficient lifting device. Most are designed high efflux speed. I'd figure out my weight and lifting capabilities with the losses from turning the airflow first. It can be done, but it is not easy. The real harrier and vtol jstf fighter pull high pressure air from the compressor to the pufferjets which you don't have. Still I bet you figure out a work around.
Rudy

[v22chap]

uriah

Eric Dainty used bleed air off one center ducted fan to control roll and yaw and pitch on his bird ,,but it was very limited to how long it could hover.

Great project ,,,wish you the best of luck on it and keep us posted with pix and vids when you can.
Larry