PDA

View Full Version : Here we go the design has started.



truckersnuts - n/a
12-Dec-07, 05:45 AM
A few topics ago i mentioned about a massive model.

Well I am going ahead with the build.

I wont disclose the size yet but its going to be big. I will keep you all up to date with the progress through out the build.



Engine wise I am looking at one of these to power it.



http://www.leavesleyaviation.com/modelgliders/jets/wren/wren (http://www.leavesleyaviation.com/modelgliders/jets/wren/wren_turboprop.jpg) _turboprop.jpg



Its a scaled down real working jet engine which powers a propeller.



Just in a matter of interest why do all small hovercraft have ducted fans? Massive versions like the srn4 and above have open propellers ie the SRN6



http://cache.viewimages.com/xc/3064333.jpg?v=1&c=ViewIma (http://cache.viewimages.com/xc/3064333.jpg?v=1&c=ViewImages&k=2&d=32F168F2F013CA9A56A48428C7CBFC85A55A1E4F32AD3138 ) ges&k=2&d=32F168F2F013CA9A56A48428C7CBFC85A55A1E4F32 AD3138



But newer versions like the AA188 has ducts.



http://www.jameshovercraft.co.uk/hover/images/large/ap1_at_s (http://www.jameshovercraft.co.uk/hover/images/large/ap1_at_sea.JPG) ea.JPG



Can anybody explain this?

profqwerty - n/a
12-Dec-07, 09:30 AM
Have you played with jet engines before?

They lag a bit between opening throttle and it actually spooling up.

kach22i - n/a
12-Dec-07, 12:50 PM
The scale test models used in the development of larger hovercraft were done for a reason; skirt design, scaling weight and handling.



From your powerplant selection I assume that recreating the sound of the craft will be part of the re-creation or illusion. This is something the test models did not even do, just another problem to overcome.



The universal awe which the guy who built a scale working Ferrari got is akin to what you are thinking about doing. He spent 20,000 hours on his project, good luck.



Link:

http://www.youtube.com/watch?v=fbcQdjf6qRw (www.youtube.com/watch?v=fbcQdjf6qRw)

truckersnuts - n/a
13-Dec-07, 06:43 AM
Hi

This model is going to be rather extreme, especially in size and power.



Yes I have owned many jet engines in the past, I have even built one years ago from a truck turbocharger.



I am working to keep the craft to a size of 10ft long because any bigger it wont fit in my study.

Engine wise I am hoping to probably use 2 gas turbine engines. one being a turboprop to power the propeller and the other to power a lift fan.

I suppose you could ride on it but i am keeping the hull design light so you could put your feet through the floor and wreck it.

Plus I wouldn't want to get to close to a 21 inch prop spinning at full power.





The only people who will ride in it are my action men and a video camera.



As for design so far the lower part of the hull is my own design but I have not yet decided on the upper part and layout.



So far I do like the look of the SRN6



http://www.simplonpc.co.uk/Hovertravel/SRN6-02.jpg (www.simplonpc.co.uk/Hovertravel/SRN6-02.jpg)



Any ideas?

profqwerty - n/a
13-Dec-07, 02:44 PM
hold on...do you really mean 10 feet?? that's pretty big. especially for inside of a study! for that size though, surely 21 inch prop is too small?

What about using the air from the jet exhsut to lift it (need a heat exchanger though!)

hovmart - n/a
13-Dec-07, 04:43 PM
this has got to be a wind up http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif

jon_curtis - n/a
13-Dec-07, 05:51 PM
surely it has, why would anyone in their right mind want to build a 10ft long radio control hovercraft for his action man? this guy is either a certified window licker or taking the micheal!

truckersnuts - n/a
14-Dec-07, 07:20 AM
This is no wind up.

This model is going to be the real deal.

As for the 21 inch prop. Depending on jet engine but will probably have 2.

Acton men are the best for using in large scale modeling.

If you think I'm crazy building such a model have a look at these.



http://www.mark-1-tank.co.uk/jpgs/tiger-1-3030b.jpg



http://www.thirtythousandfeet.com/gifs/tomthumb01-00.jpg



http://www.hpibajaforum.com/Kids/Shane1-4ScaleLegends.JPG

hovmart - n/a
14-Dec-07, 08:09 AM
so which one did you build

profqwerty - n/a
14-Dec-07, 08:17 AM
I remember seeing a video of that plane flying - tis awesome:D

jon_curtis - n/a
14-Dec-07, 01:41 PM
i can see the apeal in radio control toys, i have a couple of planes, what i dont understand is why you would want to spend more money than you would spend making a real hovercraft, or car or plane for that matter. building a radio control thing? and if it was big enough to fly or drive, why dont you get in it?



i just dont get it!



i mean those jet engines probably cost more than the cost of a complete cruising craft!



how do the action men feel about it? assume you talk to them and they all talk back, cos you are quite obviously nuts!

kach22i - n/a
21-Dec-07, 03:22 PM
Muppets, I think I understand what you are trying to do.



I say bravo, bravo.