View Full Version : Eagle 3 Hovercraft project

29-Mar-10, 09:18 AM
Hi Everyone, this is the new thread, which I have created to lessen confusion about what model I am making. Link to previouse Thread:http://www.hovercraft.org.uk/showthr...t=22431&page=2 (http://www.hovercraft.org.uk/showthread.php?t=22431&page=2)
Below is my update status from all my main posts.

Hi Guys :)


Hello everyone. As you may have noticed, I haven't made any posts since last July. This is entirely down to me, making great and idiotic miscaculations with my timescale and workload. As I have said before, I am a school child (now 14!:eek:) and, as most adolocent teenage males of this species do, I forget tto do things, and educational stuff takes over. Basically, I started to get alot more homework and GCSE preperation work for all my subject :( . This coupled with more vigerouse and numerous Rugby trainning sessions, the forum page slipped my mind. There isn't really an excuse in that, but thats why I haven't posted anything for such a long time, sorry about that :blush:.

My lack of postage, however, does not meen that I have given up with the project! Far from it, I have infact in the past few weeks, made real progress on the construction of the beast. Granted that the planning stage of the project went on for FAR to long, everything has finally been settled and put into its motions. I am about one sixth of the way throug the hull contruction on the eagle 4, I am beginning the process of attaching the softwood ribs to the cocpit sides, and then it will be a case of adding the cocpit decking! All the wood (20x20 20x40 3mm ply 6mm ply & 9mm ply) has been bought. I still need to find a 900mm duct, which will probably come from Ken from K & M Products. The plywood section were cut out on an industrial scale CNC router- although this may seem like cheating, I did actually spend about 3 hours down at the CNC plant, putting the drawings into a CAD system which can be intepreted by the computer that operates the machine. Thus all the plywood is cut to a precise and error free standard.
The 20x20 and 20x40 soft wood battons were cut out at my Grandads factory on his saw mill. I am writing this after coming back inside the nice warm office building from the cold a chilly forest of dean air lying around outside (it smells a bit like a chicken farm at the moment:)) where I have been working on the very craft, preping it for the rib installation.
I come down here now pretty much every saturday now, although it may seem like a LOOONG time to take to get to this stage, I only really began construction a month ago. My Grandad helps out when he can, as does my uncle Rich (Richard), I also have two regular helpers-Norman and Louis(Loi)-who have been very useful in tutoring me and helping out, without them I wouldn't be anywhere near where I am now, they both have backgrounds in the engineering industrie, Louis used to work in a boat yard he has been a maintinance man for many years and is a dab hand with anything mechanicle, Norman used to manage factories and worked in many different engineering enviroments. So they are both experts in this field, which helps alot! Many others have helped me along the way, but I have not the space to list them all on here, nor the time to writ them down!
I am building the craft at my Grandads factory. Where he fabricates one of the most advanced and safe asbestos removal systems available in the modern market (and thats not just a biast Grandsons prattle!). I am working on a very well constructed workbench, it about 16 ft by 9 ft. Everything is very easy to do since the bench is in a large workshop area with alot of space around it. I have been very lucky with all the help I have recieved with the project so far and am very grateful for it all :thumbup: .

I know I promised a blog and regular updates, maybe even some videos, and that will come, but unfortunately that all had to take a sideline because I have been having difficulties with getting camera that will upload photos to my computer. But I will try to set up a blog ASAP so that my project will be a little more accessible to you all and a little more posh :D.

The engine subsequently, has been changed from the originally suggested rotax 503, to a 600cc bandit engine. I have decided to use this engine, because its about the same size as the Rotax, if not a little heavier, but its almost twice as powerful. It also cost 75 as opposed to 500 for a rotax :thumbup: .

Finally, I have a few pressing questions I would like to ask of your most knowledgable selves as with regards to certain aspects of the craft construction. Firstly, I am stuck as with regards to the fan blades, hub and belt drive system. It looks like we are goin to have to buy it from K & M products, but its looking to be a little bit to expensive :( if anyone knows where I could get something just as good for cheaper, then I would be most grateful.
Secondly, I need to know whether it will be worth coating the entire craft in a water proof epoxy-resin of some description, as I am starting to have problems in my mind with the watertightness of this thing.

Well thats about all for now, but stay tuned because I WILL be updating this page, and hopefully soon a blog, with more info on how I am doing.

All the best


Hi, I am a 13 year old school boy, with a big task in mind.

In the 8th year at my school all pupils are required to do a year round project, it can be anything from making a a mini film to a corset to a 13 foot catamaran. The only specific criteria are that you must have a visible result at the end, and you must have learned a new skill or have better knowledge of a skill than at the beginning of the project.

So, me being me, I decided that I wanted to build a full sized hovercraft. Ever since I was 5 when my granddad gave me a model SNR4, I have dreamed of building my own. When the time came for me to choose what I would make for my project I thought this would be a perfect opportunity to fulfill my dream.

So, the term start on September the third 2009 and the project must be finished by may 2010. And I have decided to hit the ground running, by starting a little bit earlier. The hovercraft in question which I wish to build is a Universal hovercraft UH-12T4 (page link:http://www.hovercraft.com/content/in...ex&cPath=33_43 (http://www.hovercraft.com/content/index.php?main_page=index&cPath=33_43)(also if yo google UH-12T4 there are quite a few good sites showing detailed construction photos from start to finish). I chose this craft because of its ability to hold 2 to 3 persons, relatively simple construction and the fact that it looks very good. I have already brought the plans for this craft and intend to start construction ASAP!

The purpose of this post is to draw on the immense wealth of knowledgethat is contained within the Hovercraft Club of Great Britain and it members. I already have quite a few people who can contribute in major way to this project, I.E. supplying materials at discounted rates, using their D.I.Y/engineering skills to ade my poor knowledge of vehicle construction, and just general advice. But what I really need is people with experience in building hovercraft(or Ground effect machines). So if anyone can help in any way whatsoever please post on your advice this topic or e-mail me at c_frazer@hotmail.co.uk. Please share your knowledge with me as I need it desperately.

Below I have included a brief overview of the UH-12T4 model.

Capacity 2 to 3 Persons Payload 450 Lbs Speed 40 mph Hover Height 8 inches Length 12 ft 5 in Width 6 ft Empty Weight 375 Lbs Flotation 1500 Lbs Climb Gradient 14 to 22% Engines 3.5 to 7 hp lift (under 35 Lbs), 8 to 15 hp thrust (under 65 Lbs) Construction Method Wood Rib and Plywood Skin Construction Time 175 hours


Hello again, just a few more bits and bobs.
Firstly, I am now considering building an Eagle 1 or 3 hovercraft (links:1http://www.avdw32.dsl.pipex.com/eagle_1.htm
3http://www.avdw32.dsl.pipex.com/eagle_3.htm)instead of the UH-12T4, partly becuase of there much more simpler contruction, but also becuse they are both intergrated models and use a finger skirt, a design a favour over the bag type skirt. Do you think I should keep to th UH-12T4 or opt for these much more,"First Time Builder Friendly" plan?
Secondly the budget isn't exactly fixed, but I cannot afford anything really above 200-300, but(and thats a big BUT)My granddad owns a well sized unit on a construction business estate, and there he has most of the tool I will need. Also since he has many contact I can get a lot of the things I will need at majorly discounted prices. Also I plan on getting as much off it as I can recycled, from scrap yards and-dare I say the word-scrounged.
Thirdly , we are currently having problems locating a good supplier of Styrofoam. Please, if anyone can help on this,"Its a BIGY!".
Fourthly, I am also a bit ignorant as to the fan/s that I should be using. As aa first time builder, do you think I should be making my own fans or buying them in and if so from where and what type?
Lastly, I am meeting on Wednesday with My granddad and my uncle-both expert engineers-who are the major contributers to this project, to discus and plan out what we need costs hovercraft types etc... So basically by Wednesday we will have(or should have almost)finalized our plan of action. I shall be making a mini blog of the project through all of its stages, and I shall post the link to the site when it is up and running, and the first post has been Posted.
Yours sincerely C.S.Frazer.

Update 02

Just a small budget update, for the UH-12T4 we have been able to source a lift engine for 75 and a thrust engine 144, as for the eagle we haven't really looked into that so far but I am beginning to do some research into it. Budget has been really toned down because I can get allot of the materials for FREE(or at a greatly reduced cost). My personal budget is around 300 but as I say, before Wednesday I am not entirely sure. Thanks for all the great advice you have given me so far, it really has helped me in this project. All the best, C.S.Frazer .

Update 03

Just a quick question before the main update, is it recommended, or is it possible to use plastics instead of ply and fiberglass??


Hello Everyone!
PROGRESS: Now I have painted the underside of the craft, and the air flow duct-area which will be covered up once the plaining surfaces go on. Before that, I covered all the joints in a super strong slightly flexible vehicle mastic, which ended up taking twice as long as I thought (plus a very sore hand due to the stiffness of the mastic and the power needed to push it out). This seems though, to have made the craft twice as strong, which is lucky since wwe have just transported it about 30-40 miles over quite rough terrain and only one piece was damaged! :-) I have also cut out (with help- infact most of it has had to be done with help) some polysterene for floatation aid, should the craft be marooned out in a river or a lake.

WHATS HAPPENING NEXT?? Well, the plaining surfaces are going to be attached to the ribs., this involves the ever so common job of fiberglassing 8=) apparently its quie easy so im looking foward to it . To attach the plaining surfaces to the ribs, im going to use guerilla glue (super-glue) and a very satisfying nail-gun.