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Search: Posts Made By: Gripenland
Showing results 1 to 25 of 65
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Forum: General Boating Discussion
09-14-2012, 11:41 AM
Replies: 269
Views: 56,738
Posted By Gripenland

Here are some simulations of a flat window with...

Here are some simulations of a flat window with frame. The pressure applied is equivalent to the dynamic pressure at 80 mph. The window flange is 2" and so is the strip of adhesive.

The window is...
Forum: General Racing Discussion
02-20-2012, 03:01 PM
Replies: 3
Views: 1,117
Posted By Gripenland

I'm also curious :whistle:

I'm also curious :whistle:
Forum: General Racing Discussion
02-14-2012, 01:36 PM
Replies: 12
Views: 3,035
Posted By Gripenland

Good initiative! Any info on the special...

Good initiative!

Any info on the special guests?
Forum: General Racing Discussion
01-27-2012, 04:48 PM
Replies: 12
Views: 3,035
Posted By Gripenland

Well spoken! There is a lot of work to be...

Well spoken!

There is a lot of work to be done and I intend to do my part. As a safety engineer I can appreciate the difficulty of making change for safety.

Good post!
Forum: General Boating Discussion
12-17-2011, 06:56 AM
Replies: 39
Views: 15,859
Posted By Gripenland

I have crash tested a few belt-in-seats in my...

I have crash tested a few belt-in-seats in my career. Both with and without shock absorbing.

All of them has failed the first test due to strength issues. Failed hinges, failed seat belt...
Forum: General Boating Discussion
12-16-2011, 12:44 PM
Replies: 39
Views: 15,859
Posted By Gripenland

KAP, obviously my post didn't make any sense so...

KAP, obviously my post didn't make any sense so I'll try again.

Your argument is valid if you have a suspension seat with belt fixations in the walls and/or floor i.e fixations that doesn't move...
Forum: General Boating Discussion
12-16-2011, 10:37 AM
Replies: 39
Views: 15,859
Posted By Gripenland

KAP, your argument doesn't apply on Viperfitness1...

KAP, your argument doesn't apply on Viperfitness1 seats. Since they are belt-in-seat. You will not compress the spring when putting tension on the shoulder straps. All the belt fixations are "above"...
Forum: General Boating Discussion
12-16-2011, 06:57 AM
Replies: 39
Views: 15,859
Posted By Gripenland

It's very difficult to focus on the seat with two...

It's very difficult to focus on the seat with two massive engines in the picture. :p

The belt geometry looks good with your changes! But the upper fixation looks very weak IMHO.
Forum: General Boating Discussion
12-15-2011, 04:36 PM
Replies: 39
Views: 15,859
Posted By Gripenland

It's good to see that you use genuine racing...

It's good to see that you use genuine racing seats with side supports for the head!

The seat is an important part of the safety system but often forgotten.

Seat belt geometry has already been...
Forum: General Boating Discussion
12-15-2011, 09:39 AM
Replies: 269
Views: 56,738
Posted By Gripenland

I'm not sure I understand how a check valve (non...

I'm not sure I understand how a check valve (non return valve) would work to help bringing air in to the cockpit but keeping water out?

Other solutions could be a roll over valve similar to the...
Forum: General Boating Discussion
12-10-2011, 04:52 PM
Replies: 269
Views: 56,738
Posted By Gripenland

A water tight cockpit will be very difficult to...

A water tight cockpit will be very difficult to open if up side down due to the outside water pressure.

What is the best solution to this problem?

A secondary hatch in the tunnel will work for...
Forum: General Boating Discussion
12-09-2011, 12:43 PM
Replies: 269
Views: 56,738
Posted By Gripenland

Any ideas on how to preform a real world test? ...

Any ideas on how to preform a real world test?

What type of accident would generate the most force on a cockpit?

Stuff?
Flip?
High speed roll?
Forum: General Boating Discussion
12-03-2011, 04:10 PM
Replies: 269
Views: 56,738
Posted By Gripenland

Component testing is always a good start. ...

Component testing is always a good start.

The pod would be designed to deflect/mitigate energy not to absorb energy. Therefore a full size pod test would only be destructive if the pod fails.
Forum: General Boating Discussion
12-03-2011, 11:51 AM
Replies: 269
Views: 56,738
Posted By Gripenland

Thanks, Tom. I have the uttermost respect for...

Thanks, Tom.
I have the uttermost respect for your fea simulations and your work with the UIM but I have to disagree with the material test.

The four point bending test is a common test for...
Forum: General Boating Discussion
12-03-2011, 10:47 AM
Replies: 269
Views: 56,738
Posted By Gripenland

Very impressive, MissGeicoRacing! The "no...

Very impressive, MissGeicoRacing! The "no nonsense assessment "is awesome!

I'm a little curios about some things in your post.
If I understand correctly, Miss G uses a "top hat" canopy with...
Forum: General Boating Discussion
12-03-2011, 06:27 AM
Replies: 269
Views: 56,738
Posted By Gripenland

Tom, good to see you in this thread! I've seen...

Tom, good to see you in this thread! I've seen some of your earlier FEA work.

Can you tell us more of the panel test that is used by the OPC category of APBA?
...
Forum: General Boating Discussion
11-30-2011, 03:22 PM
Replies: 269
Views: 56,738
Posted By Gripenland

According to the video the windscreen was triple...

According to the video the windscreen was triple layered, 30 mm thick.
Forum: General Boating Discussion
11-29-2011, 02:03 PM
Replies: 269
Views: 56,738
Posted By Gripenland

Glassdave, if you want to measure loads on a...

Glassdave, if you want to measure loads on a cockpit i would recommend strain gauges. They only cost a few $ each so you can apply them in a pattern over a large surface.

The strain can be...
Forum: General Boating Discussion
11-29-2011, 01:30 PM
Replies: 269
Views: 56,738
Posted By Gripenland

There is pressure sensitive paint. But I've only...

There is pressure sensitive paint. But I've only seen it being used for air pressure.

http://psp-tsp.com/images/psp/applications1.png


http://psp-tsp.com/
Forum: General Boating Discussion
11-29-2011, 01:06 PM
Replies: 269
Views: 56,738
Posted By Gripenland

I've seen that to. Apparently it's used to...

I've seen that to. Apparently it's used to measure g-forces on packages sent trough the mail or something? I've never seen it being used in other safety applications. I'll google it and see what I...
Forum: General Boating Discussion
11-28-2011, 12:51 PM
Replies: 269
Views: 56,738
Posted By Gripenland

I got it, Steve 1. You do it your way and I do it...

I got it, Steve 1. You do it your way and I do it my way.
Forum: General Boating Discussion
11-28-2011, 11:46 AM
Replies: 269
Views: 56,738
Posted By Gripenland

Correct. The hydrostatic pressure for a flat...

Correct. The hydrostatic pressure for a flat section is 144psi at 100MPH.

So if you shape your cockpit like a brick you will see 144 psi at 100 mph.

I haven't seen many brick shaped cockpits so...
Forum: General Boating Discussion
11-28-2011, 08:05 AM
Replies: 269
Views: 56,738
Posted By Gripenland

I'm not sure I understand how you end up with...

I'm not sure I understand how you end up with those numbers? 580 PSI is extremely high?



I'll give an example of my own (this is a rough estimation):

Check out:...
Forum: General Boating Discussion
11-26-2011, 03:38 PM
Replies: 269
Views: 56,738
Posted By Gripenland

I know, and you are probably right. But forged...

I know, and you are probably right. But forged composites are becoming more popular. Usually in high volume applications though.
Forum: General Boating Discussion
11-26-2011, 03:19 PM
Replies: 127
Views: 67,779
Posted By Gripenland

Thick windows! I like it! How much more...

Thick windows! I like it!
How much more expensive is stretched acrylic then polycarbonate? Twice the cost? What kind of UV/scratch protection do you use on PC (if not a trade secret)?
Showing results 1 to 25 of 65
 
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