Sponson design

[Tim_Duggan]

More to the point, pad width. What's the narrowest pad width that will still launch OK on a 3 3/4 LB's 21 rigger?

I had them a wisker wider than 1.5" and they generated way too much lift causing many blow-overs, even after dropping the AOA to under 3.0 degrees.

I really like the way the boat works everywhere on the course except the last 1/3rd of the straights where it gets too light in the fronts, so my thoughts are to keep the same sponson profile but reduce the pad width (and lift) rather than relying on downforce or slowing to keep them down. The side effect I'm concerned about is whether it will still launch OK with narrower front sponson pads.

Anyone have any info on this subject or any insight?

Thanks,

Tim

 

[anthony_marquart]

.875 - 1.0 are good numbers..

 

[Chris Wood]

i ran as low as .750 @ 5 degrees attack angle

lol i will wait for the WHAT? HOW?

lol

 

[RodneyPierce]

My current set is 1.125 and the new set is .9375.

 

[anthony_marquart]

No "what or how" but I am interested in how that worked.. did the sponsons tend to dip and drag? or teeter back and forth from side to side. That's what I got when I ran real narrow with high AOA..

i ran as low as .750 @ 5 degrees attack angle

lol i will wait for the WHAT? HOW?

lol

 

[Chris Wood]

work just fine on my boat.. but that is me. i could put them on someone elses and it would be a trash truck

 

[Tim_Duggan]

Thanks everyone, have made a set 1.00" wide and will test shortly.

 

[RodneyPierce]

Thanks everyone, have made a set 1.00" wide and will test shortly.

they will be just golden

 

[shoboat]

Chris,

Have you got your sponsons wet yet this year? Are we going to see

you racing anytime soon?

Just Wondering,

Mark Sholund

 

[Chris Wood]

nope and nope mark.

i am all washed up.

 

[MikeP]

Tim,

Are you working on FF sponsons?

Mike

 

[gooycheese]

nope and nope mark.

i am all washed up.

Chris,

You are FAR from washed up...

 

[Tim_Duggan]

Tim,

Are you working on FF sponsons?

Mike

Hi Mike, long time no speak - hows things?

Sort of - working on a prototype which is an evolution of the original FF. Major changes everywhere.

 

[MikeP]

Tim,

Are you working on FF sponsons?

Mike

Hi Mike, long time no speak - hows things?

Sort of - working on a prototype which is an evolution of the original FF. Major changes everywhere.

Tim

Things are good here, looks like you are still getting after it.

I was going to mention that cutting the large sponson top down to more like a crapshooter style seems to get rid of that lift off at the end of the straights. Still leaves you with a little non trip outside edges.

After seeing the pics I understand now......