Front window rock protection

Dalehelman · April 2019

Use only this product. Available at Walmart or Home Depot.

ADRawli · April 2019

We just need Dale to come up with one of these for our T@Bs, with a hole for the hitch to stick out while towing 😁

Dalehelman · April 2019

I like it

lkc001 · April 2019

@Dalehelman you used the double sided tape to attache the & channel, no screws, correct?

Dalehelman · April 2019

lkc001 said:

@Dalehelman you used the double sided tape to attache the & channel, no screws, correct?

Correct

lkc001 · April 2019

@Dalehelman--thanks! another great mod from the master

lkc001 · April 2019

@ADRawli Is that a for real thing?

ADRawli · April 2019

@lkc001 It really is. I have a neighbor at the other end of the block that has two of them. You can find them on Amazon for around $240-$330, depending on size:
https://www.amazon.com/gp/offer-listing/B07PQPQXW9/ref=olp_twister_child?ie=UTF8&mv_size_name=3&qid=1555700777&sr=8-37

mandt · April 2019

Does the stone come from passing cars or from your tv kicking it up?

Dalehelman · April 2019

Vehicles going in the opposite direction. Opposing vehicles doing 60 mph each equals a rock doing 120 mph.

Luckyj · April 2019

Dalehelman said:

Vehicles going in the opposite direction. Opposing vehicles doing 60 mph each equals a rock doing 120 mph.

Sorry, but this is not right.

The incoming vehicule will act as a rock or a solid structure and technicaly will not move. So same force will apply and result. If a car hit a semi trailer truck at same speed, of hit an in coming semilar vehicule that come faster (like let say twice the speed) them more energy than a rock will be transmited toward the slower and/or lighter vehicule and this last one will have supported more energy. But not necessarly twice as stated up-here for equal opposing speed.

Dalehelman · April 2019

Luckyj said:

Dalehelman said:

Vehicles going in the opposite direction. Opposing vehicles doing 60 mph each equals a rock doing 120 mph.

Sorry, but this is not right.

The incoming vehicule will act as a rock, and technicaly will not move. So same force will aplly and result. If a car hit a semi trailer truck at same speed, of hit an in coming semilar vehicule that come faster (like let say twice the speed) them more energy than a rock will be transmited.

Thanks for the clarification. I think.

falcon1970 · April 2019

I think what Dalehelman was saying is that opposing velocities combine. If a rock is moving at 60 mph and you are moving at 60 mph in the opposite direction the effect is the same as if a rock were moving at 120 mph and you were stationary. In real life, if an opposing vehicle moving at 60 mph were to kick up a rock, the rock would probably not attain 60 mph. However, even if the rock was kicked up and was stationary (in relation to the highway) and you were moving, the rock would have the force (f=ma) of your velocity. Enough to chip a window on your vehicle--as I have discovered several times.

DougH · April 2019

(kinetic energy)

Luckyj · April 2019

falcon1970 said:

I think what Dalehelman was saying is that opposing velocities combine. If a rock is moving at 60 mph and you are moving at 60 mph in the opposite direction the effect is the same as if a rock were moving at 120 mph and you were stationary. In real life, if an opposing vehicle moving at 60 mph were to kick up a rock, the rock would probably not attain 60 mph. However, even if the rock was kicked up and was stationary (in relation to the highway) and you were moving, the rock would have the force (f=ma) of your velocity. Enough to chip a window on your vehicle--as I have discovered several times.

I know excatly what is was saying, but it is not thrue. Use to think that my self too. As a paramedic, how work and traumas scene analyses depend on speed ans energy. But After talking to a doc after a face to face impact between a 1990 ish jeep cherokee and a 53 ft semi at 60 miles per hour, the doc told me that my assesment of the twice thw speed was wrong got me into searching and I realized how wrong I was.

it is physic 101.

this will explain it way better than I can.

http://warp.povusers.org/grrr/collisionmath.html

DougH · April 2019

Another way of thinking of it is all the kinetic energy carried by vehicles or brick walls (0.0) is converted to damage when stopped, aside the karmic debt portion. KE = 1/2 m v^2. A vehicle doing 50m/s carries four times the energy of one doing 25m/s. But two vehicles at 25m/s carry only twice the energy. So yup, not the same as twice the speed. Still twice what one car at 25m/s carries.

Dalehelman · April 2019

DougH said:

Another way of thinking of it is all the kinetic energy carried by vehicles or brick walls (0.0) is converted to damage when stopped, aside the karmic debt portion. KE = 1/2 m v^2. A vehicle doing 50m/s carries four times the energy of one doing 25m/s. But two vehicles at 25m/s carry only twice the energy. So yup, not the same as twice the speed. Still twice what one car at 25m/s carries.

Now you did it no more camping for me.

Ratkity · April 2019

DougH said:

Another way of thinking of it is all the kinetic energy carried by vehicles or brick walls (0.0) is converted to damage when stopped, aside the karmic debt portion. KE = 1/2 m v^2. A vehicle doing 50m/s carries four times the energy of one doing 25m/s. But two vehicles at 25m/s carry only twice the energy. So yup, not the same as twice the speed. Still twice what one car at 25m/s carries.

My brain hurts. Are the equations always in metric? I always hated physics for that. Now, dilutions in metric, no problem for me. It's physics, not math in general. lol

Sharon_is_SAM · July 2019

Success! One less thing to worry about.

Dalehelman · July 2019

@Sharon_is_SAM
Very nice work. Get ready a lot of folks are going to know just how you did it.

Sharon_is_SAM · July 2019

And I’m going to refer them to DH John!

ChanW · July 2019

Nice!

Sharon_is_SAM said:

Success! One less thing to worry about.

ScottG · July 2019

My general observation is that people who worry about things must maintain a certain worry balance. I.e., once you solve one problem another arises to take it's place. ;-)

Nice cover, though! Can it stay in place as the window open thus doubling as a translucent privacy screen or sun shade? It sorta' looks like it can.

Sharon_is_SAM · July 2019

Yes Scott. We are already onto our next worry to fill that worry void! The new worry involves a raised, cargo platform for the van cabin to allow for a flat surface. John is on his second trip to Home Depot. Not done with this project. This is going to be a real redneck solution, so, no pictures will follow. If we like the idea, I may recruit someone with real skills to copy the prototype.

The window cover plastic u channels are mounted directly on the lexan, so, yes, you can open the window and it acts to diffuse the light. I much prefer my red and white striped window covers😁

Dalehelman · July 2019

@Sharon_is_SAM

I did place a layer of this plastic between the Coroplast and the window. To prevent the possibility of scratching the window.

http://www.walmart.com/ip/Auto-Expressions-Insta-Cling-Window-Tint-Extra-Dark-5/16672493

Sharon_is_SAM · July 2019

Good to know @Dalehelman. I see a trip to Walmart in the very near (immediate) future🙂

jkjenn · July 2019

I tried the plastic....I was unsuccessful, lol.

Sharon_is_SAM · July 2019

@Dalehelman, the Cling Window film worked nicely. Did you put a nut behind those screws? Our u channel holes are not threaded. How do you get the screws to stay put?

Dalehelman · July 2019

@Sharon_is_SAM
I uses a thread tap to thread the hole for the thumb screw.

Sharon_is_SAM · July 2019

Ok, tape it is!

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