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View Full Version : New blades design - custom made from BUFOcraft



bufo - n/a
5-May-08, 08:45 PM
Like it or not we did it, and we will test them in Sweden in August...



http://www.bufocraft.net/HCGB/blades/blades.JPG



More pictures at gallerie at http://www.bufocraft.net/HCGB/blades/ (www.bufocraft.net/HCGB/blades/)

LouiseBeale - n/a
6-May-08, 07:37 AM
Just to check that you are aware that they have to be load tested etc and approved for use by the WHF?

bufo - n/a
6-May-08, 10:57 AM
We can run them at 137 m/s, but not more... http://hovercraft.org.uk/images/icons/smiley_icons/icon_cool.gif



p.s. blades are much stronger as hascon wing blades or multi wing, our blades dont twist, they are aerodinamics designed (complete blade) and can go no problems to higher tip speed, but unfortunatly is not alowed to turn them faster for the race.

Nauti Buoy - n/a
6-May-08, 02:22 PM
I think what Lou is saying is that the blades will need testing by the officials/club/whf(?) before you can use them at any race meeting.



If you don;t get them tested befor ethe event, you won;t be using them AT the event.

jon_curtis - n/a
6-May-08, 05:49 PM
1 step forward 2 steps back! are they really machined from wood?



what is the weight comparison between your blade and a mulitwing blade?

bufo - n/a
6-May-08, 08:14 PM
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are they really machined from wood?
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I hope you don't think we paint the hascon wing blades in grey http://hovercraft.org.uk/images/icons/smiley_icons/icon_surprised.gif

Our blades are designed by one of our friend - hydrodinamic expert and aerodynamic expert by special 3D program with software simulations, for optimum operating at speed range 40 - 100 km/h.



They are made of same material as airplane probellers. I am noot wooden expert, so I do not know exactly witch. Wood is is glued by segments with epoxie, simular as plywood.

After shape was cut on CNC tooling (so yes they are machined from wood), the blades were exposed to poxies for several hours under pressure of 8 bars so most of wood cells is filled with epoxie.

Blade construction is sort of epoxie in sandwich with plywood. Hard to describe. Blades are realy incredebly strong. I was surprised as well when I got them.

Pictures from above are not finished product yet, finalization work and paint protection is missing, we will use polywretane transparent paint so structure stays visible and keeps the look of the wood.



Realy lot of hand work left http://hovercraft.org.uk/images/icons/smiley_icons/icon_confused.gif , but once is done, it will look crazy.



<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText">Quote&#58;</td></tr><tr><td class="quote">
what is the weight comparison between your blade and a mulitwing blade?
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Comparing the wooden blade to hascon, the wooden is ofcourse a bit heavier (not much), mostly because of larger Volumen, becuase it has different aerodynamics as hascon or multiwing. Ofcourse we can manufacture same blade in carbone version in sandwich with polywretane foam, in that case we get same shape in lighter version as any blade. But carbon is not alowed at WHC as much as I know.



Any whay our aim is NOT to have advantage on the race because of better blades, but we come to show what we can make http://hovercraft.org.uk/images/icons/smiley_icons/icon_cool.gif And wooden blades are just optional impeller on our recreational hovercraft - custom impeller and is also very interesting for the eyes.

sixpackpert - n/a
6-May-08, 09:14 PM
Realy lot of hand work left http://hovercraft.org.uk/images/icons/smiley_icons/icon_confused.gif , but once is done, it will look crazy.






Can't see the point personally. http://i41.photobucket.com/albums/e253/sixpackpert/getmecoat.gif







Any whay our aim is NOT to have advantage on the race because of better blades






I don't think you will, but we won't know unless you get them tested and race them. http://hovercraft.org.uk/images/icons/smiley_icons/icon_twisted.gif

bufo - n/a
6-May-08, 09:23 PM
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Can't see the point personally.
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It is the matter of taste ofcourse.



Beside better efficiency and much lower nosie level, and if we turn them the same rpm as hascon or multy we get out more thrust at same HP... I do not see the point neither - when ther hascon and multiwing exist already, why other should develop new blades... http://hovercraft.org.uk/images/icons/smiley_icons/icon_razz.gif waste of time I gues...

hover t - n/a
6-May-08, 09:39 PM
Are your blades quieter running and whats the thrust power like with them compared to the MultiWing or Hascon?

Nice to see you doing something about the fan blade black hole, it would be good to be able to get a set of blades designed especially for hovercraft.

Keep up the good work. http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif

all the best

Trev

Kevin Eastwood - n/a
6-May-08, 09:44 PM
Just a question and although they have been exposed to epoxy but being "wood" where they fit into the sockets of the hub what happens when any water/moisture gets in here?

How much movement/allowable tollerance is there to

A:swell expand and making adjustments to the pitch difficult when nessecary.

B:shrink in hotter climates making them loose and possibly move when you put on the power

bufo - n/a
7-May-08, 05:18 AM
<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText">Quote:</td></tr><tr><td class="quote">
Are your blades quieter running and whats the thrust power like with them compared to the MultiWing or Hascon?

Nice to see you doing something about the fan blade black hole, it would be good to be able to get a set of blades designed especially for hovercraft.

Keep up the good work.

all the best

Trev
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Thanks Trev. Offcourse blades like my would be too expencive. We can make them in Nylon 66 version as well - in that case price would be same as any other blade, but problem is that is quite big investment in developing the tooling and blade is not tested in all conditions yet. As I said we need to test them in action first (so far they were tested only for an hour or two on the hovercraft). We will see...



<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText">Quote:</td></tr><tr><td class="quote">
Just a question and although they have been exposed to epoxy but being "wood" where they fit into the sockets of the hub what happens when any water/moisture gets in here?
</td></tr></table>

As I said... we need to test them http://hovercraft.org.uk/images/icons/smiley_icons/icon_cool.gif , anywhay they should be watter resistant, in worst case hub will brake http://hovercraft.org.uk/images/icons/smiley_icons/icon_redface.gif , but as I said, it is a prototype made for testing and not for selling. If design proves to be good, we go to Nylon 66 version and same design...

profqwerty - n/a
7-May-08, 11:07 AM
If you don't mind me asking [trade secrets and all that], what'd be the main difference in the design or your blades compared to say multiwing blades?

People are saying 'designed for hovercraft'...but what would be the difference of designed for hovercraft compared to whatever the mainstream blades are designed for?

Jonathan - n/a
7-May-08, 03:04 PM
Good Luck!



Nice to see someone trying to improve fan design,

BTW, Carbon blades WERE used at the 2004 and 2006 worlds by Kent Gano. They were designed by an Australian, they produced better thrust with lower noise, but unfortunately they only fit one size duct (its the tip design that made them special).

I believe it was called the fireblade.



Once again good luck

Jonathan

kach22i - n/a
7-May-08, 06:09 PM
Sexy looking blades, lets hope they don't end up as toothpicks. http://hovercraft.org.uk/images/icons/smiley_icons/icon_cool.gif

jon_curtis - n/a
7-May-08, 06:18 PM
thats the thing, if each blade is slighty heavier, then with a full set, there would be significantly higher rotational mass, and further guarding would be required to contain. and if they go, i would assume large bits of wood flying about, as opposed to a fan which breaks up into lots of bits.



machining from nylon sounds very expensive, its good to see someone trying to produce better fan blades for hovercraft, there are multiwing fans in our aircon at work lol.

but its going to be an expensive process, and not sure the benifit would outway the expense?



you really need to think about the final thing being manufacture is some sort of moulding process, if made from a polymer

bufo - n/a
7-May-08, 06:21 PM
<div class="pre"><pre>If you don't mind me asking [trade secrets and all that], what'd be the main difference in the design or your blades compared to say multiwing blades?
People are saying 'designed for hovercraft'...but what would be the difference of designed for hovercraft compared to whatever the mainstream blades are designed for?</pre>[/center]

Difference is aerodynamics, optimized for speed range 40 - 100 km/h, like they do at airplane plopeler design... Tuch the blade and you will fill the difference http://hovercraft.org.uk/images/icons/smiley_icons/icon_razz.gif . The pilot Renato Presotto that will ride my hovercraft at race saw them and tuch them on last Sunday when he was at my place, ask him of opinuen if you do not belive me.

Aerodinamics of multiving and hascon is far away from optimum or ideal http://hovercraft.org.uk/images/icons/smiley_icons/icon_razz.gif thats clear to anyone that has some idea of what aerodynamic is...

The reason they are from wood is only because of the price, because designe needs to be tested first... and manufacture nylon 66 vesrion of blade takes expencive moulding proces behind...

Maybe they are bullshi..., I dont know... we will see after I test them http://hovercraft.org.uk/images/icons/smiley_icons/icon_rolleyes.gif

Nauti Buoy - n/a
7-May-08, 07:45 PM
Bluddi hill, we can say 'bullshi' on here. Thas fucine amazin'.



Still need to get them tested tho.

team black - n/a
7-May-08, 08:52 PM
Russell!!!!!

bufo - n/a
8-May-08, 03:40 PM
GG