Thread: GP Aero Package
01-05-2008, 11:32 PM #1
GP Aero Package
Im convinced with the 80+ speeds and hull attitude of the GP at those speeds that the underside of the hull area directly inside of the bumpers has the drag coeffecient of a parachute from the huge U shaped area that does nothing but grab air, and has no place for the air to exit.
16 work hours later i have configured this rough draft of an aero kit to block and redirect the airflow away from this huge air trap.
The stock GP hull design has a total of 9 feet on each underside of the hull that does nothing but grab air and hold it.
Weather permitting i will get some preliminary testing done tomorrow..
01-05-2008, 11:40 PM #2
Good deal Ross! Gimme a call when your done testing.
01-06-2008, 12:59 AM #3
I was thinking about someway filling those in.. but didn't know how to do it..
anyway tell us how the results go... looks good!
01-06-2008, 01:01 AM #4
...and others have said it's one of the things keeping the gpr nose-up attitude.
Doesn't hurt to try!
01-06-2008, 01:54 AM #5
I had spoken Jim a while back about the sponsons also. I always wondered, if you ride side by side with another ski you will notice all the water blasting up between the hull and the sponsons. I don't know if you guys had ever experimented but I had thought taking maybe a bicycle tube and cutting into a flat gasket and seal up the plates to the hull and see if there was any aerodynamic gains there as well. I wondered if at those speeds if you can make a tight pressure pocket between the water and sponsons back there if it would help or at least help in stability.
Just a thought
01-06-2008, 08:27 AM #6
Innovation !!!sweet, Let us know your findings Rossman
01-06-2008, 09:32 AM #7
very nice ross !
Think outside the box and share results...... you da man
01-06-2008, 10:41 AM #8
01-06-2008, 12:04 PM #9
Very interesting. Let us know how it works. I filled in the lip on the rear third of my skis with some semi-structural foam over a year ago. It seems to have helped. I might get some kits from Leo in March if Uncle Sam treats me ok.
01-06-2008, 01:57 PM #10
- Join Date
- Jul 2005
- Central North Carolina
Ross, we filled this aera in about 4 years ago and found that this open aera under the rub rail helps lift the front of the hull up off the water at speed with the front of the ski angle up at about 5 degrees or more . When we filled it in we LOST speed. The lift was more help for improved speed than the gain from it's aero improvement. Tommy Jordan
Last edited by 2fast4u; 01-06-2008 at 02:03 PM.
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