Where is Yipster?

My model plug is ready!

 

i'm here my frend, wanna show us what your doing? thought i saw you on eurosport but those offshore triple step boats were open

 

At last we see you without the shades! Cool dude!!

 

so where is the MIB glasses that made u so cool... like a tuna killer?... I prefer the raybane version... nice pic...

 

Running Surface

A Picture worth a thousand words??

 

Yipster's got EYES !! I thought the man was a BLIND sailor

Verytricky, is that a bait boat for fishermen ?

 

Jou Gat Boertjie!

 

Very nice comment there Verytricky, and that for such a large member.

Why don't you explain what it is so we can learn from it ?

 

thats a raceboat Fanie, my african is poor it seems, 3 words and only boertje is dutch but saw the deadrise lines and reply's
good to see the pics and progres, how big is that model, how is that gonna be tested and more
for no good reason i sort of like the canopy form and wonder bout the deep steps and iff i see a small centerline rail
you also mentioned a flat running pad right? keep me posted and dont hurt your backbone

 

VT,

Beautiful work on that plug. From the person standing nearby, it looks about 6-7 ft/2 m long? Don't know if you're hiding the details of the bottom, but the inverted pix showing the 2 steps is intriguing. Almost look like notches, although it's hard to see in that pix. If possible, some more pix of the bottom would be nice.

If I remember correctly, you're planning on the wings being functional, giving WIG effect; that's cool.

In the pre-Moppie era, when I was a mere lad, a fine entry with very high deadrise forward, transitioning to a flat area at the transom, gave small powerboat hulls good roughwater ability at planing speeds. Looks like you've incorporated some of those principles in your hull, as opposed to a constant deadrise.

 

Each 'hull' is designed to do its job differently, so each segment of the boat is more or less divorced from the rest of the boat. It may or may not work, but it was my theory. When running 'flat' as the boat is designed to do, the hull running surfaces will provide a 5 degree angle of attack. Some of the parts of the hull are 'hidden' as they may work, may not work, and I want to test the prototype first, before revealing their true form.

It has a large amount of recovery built in if I stuff it, and a very flat planing surface, whilst still complying with the UIM rules for monohull.

The whole running surface has been designed for the English coast, and as such would classify as a 'rough water boat' as this is our default sea state!

The end boat, as measured per UIM formula, will be 29' 10" ( 9.093 meters ) - this is due to my wish to attempt several UIM world speed records ( offshore ) for the 'under 30' category of craft. So you can say the end result is a 30 foot boat, and this is a 1/5th scale model. It is over 6 foot with the things the UIM does not measure.

The mould from this plug is being built as we type, and then the plug is being sent to chack some calculations regarding air manupulation, whilst the first prototype model will be made from the mould, fitted with RC and tested in the harbour to see how it actually handles the waves.

Air manipulation is threefould - One to create a low pressure section just above the engine to provide some lift, two to help the flow of air into the void created by the boat, reducing vaccume drag, and three to help stop 'slamming' when re-entring the sea off a wave.

The wings do also provide lateral stability, and because they are at the rear section of the boat, help prevent a blow back if you 'kite' the boat.

 

Can you use a hydrofoil for keeping the boat to fly up ? If it is allowed it can run neutral, then as the boat starts to lift the hydrofoil trims down a little.

 

Hydrofoils are a different animal and one I have little knowledge of. I assume Hydrofoils need to be in the water to work, and we spend about 1/3rd of the time out of the water at 80mph due to the roughness of the sea, so I am assuming the Hydrofoil will get damaged coming in and out of the water.

Some examples from the last year in a similar design.

 

Oh I see now... it's an aircraft that flies low over water.

Saw a small servo driven cat hull model on youtube. These things really move for it's size.

How is your's propelled ?

 

I will be using a 8.2 l v8 powering a duoprop. We expect a top speed IRO 115mph ( setup for short distance records ) and a crusing speed IRO 90mph in the sea.