Forum Discussion
sleepy
Jul 26, 2013Explorer
Bcbigfoot I think that your windsheild is an intregal part of your wind deflector... it is at the optimal 45 degrees (like a talus cone... any more verticle angle the wind pressure will build up... and if the windheild is any more horzontal the wind will accelerate into the gap between the Cab and cabover.
Here is the picture of your truck and deflector.
BCbigfoot...As far as noise... I think that your 45 degree deflector would function better if its most forward point was at the top of the trucks windsheild. Looking at the bernoulli effect below you can see that a large part of your trucks roof is in the highest pressure area from the accelerated wind and from the very high speed compressed air.
BJBear I am using some parts of your excellent post:
Your thoughts on the Bernoulli effect are extremely important.
Especially when you asked me: Have you considered the Bernoulli effect resulting from the alignment of the cab and camper overhang??
You made me try to explain it in a way that makes sense and your illustrations are essential.
you go on to say:
I am thinking that this effect will greatly intensify the force exerted on the camper bulkhead behind the cab. Probably several times higher that that exerted on the front of the camper overhang and truck itself. This is a result of the dynamic pressure (kinetic energy) which is a function of velocity squared.
Is it possible that the air foil works in part more by slowing the volume of air between the cab and camper overhang and therefore reducing the velocity and thereby the dynamic pressure? This should enhance the improved fuel economy being experienced.
and you commented... At this point, I am thinking that dampening the Bernoulli effect might have more of an effect than the displacement of air to the sides (like your barge analogy). Although displacing the air sideways also reduces the air volume and therefore velocity!
Here is the picture of your truck and deflector.
BCbigfoot...As far as noise... I think that your 45 degree deflector would function better if its most forward point was at the top of the trucks windsheild. Looking at the bernoulli effect below you can see that a large part of your trucks roof is in the highest pressure area from the accelerated wind and from the very high speed compressed air.
BJBear I am using some parts of your excellent post:
Your thoughts on the Bernoulli effect are extremely important.
Especially when you asked me: Have you considered the Bernoulli effect resulting from the alignment of the cab and camper overhang??
You made me try to explain it in a way that makes sense and your illustrations are essential.
you go on to say:
I am thinking that this effect will greatly intensify the force exerted on the camper bulkhead behind the cab. Probably several times higher that that exerted on the front of the camper overhang and truck itself. This is a result of the dynamic pressure (kinetic energy) which is a function of velocity squared.
Is it possible that the air foil works in part more by slowing the volume of air between the cab and camper overhang and therefore reducing the velocity and thereby the dynamic pressure? This should enhance the improved fuel economy being experienced.
and you commented... At this point, I am thinking that dampening the Bernoulli effect might have more of an effect than the displacement of air to the sides (like your barge analogy). Although displacing the air sideways also reduces the air volume and therefore velocity!
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