Windshield brace
- tamnalan
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Windshield brace
I've never felt comfortable with the buffeting my windshield suffers at speed. I'm experimenting with some sort of brace that will be easy to take on/off and won't stick out much. I would use it for convoys / highway trips. Here's what I have so far. What other ideas are out there?
Alan W. Johnson
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
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Re: Windshield brace
Does it reduce the buffeting?
Look up some of the Korean War era photos of MB's in Korea, note the rods used to brace the windshields.
Look up some of the Korean War era photos of MB's in Korea, note the rods used to brace the windshields.
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- tamnalan
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Re: Windshield brace
It won't reduce the buffeting but it should reduce the stress on the outer windshield tubing bend. I've found that opening the windshield a bit helps with the buffeting.
I've seen some old photos where a piece of wood or bar stock was fastened to the same two points I'm using. I'm going to try a shorter cord that wraps around the windshield tube at the windshield's lower corner.
I've seen some old photos where a piece of wood or bar stock was fastened to the same two points I'm using. I'm going to try a shorter cord that wraps around the windshield tube at the windshield's lower corner.
Alan W. Johnson
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
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Re: Windshield brace
Whilst not exactly a brace, on the windshield of my AC Cobra it had Plexiglas deflectors, without which the buffeting was quite severe.I also incorporated these on my pre-war MG midget to great effect. This is a problem endemic to all vehicles with flat windshields.
Most modern sportcars also have a mesh screen behind the driver and passengers heads to shield them from buffeting by the wind.
Whilst I am not advocating these mods should be incorporated into Jeeps, these are others' solutions to the problem.
Most modern sportcars also have a mesh screen behind the driver and passengers heads to shield them from buffeting by the wind.
Whilst I am not advocating these mods should be incorporated into Jeeps, these are others' solutions to the problem.
Rod Rushton - Winner 2013 MVT Wilkinson Sword Trophy
Exeter Devon UK
FORD GPW 202055 DoD 5 - 22 - 44 Serial# 20534360
MBT # 25553 DoD 4 - 43
Piper Cub 1944 L4H 480015 G-AKIB
1942 CHEVROLET G506 CARGO. #2NM 213219
1943 AUSTIN LIGHT UTILITY M6448770
Exeter Devon UK
FORD GPW 202055 DoD 5 - 22 - 44 Serial# 20534360
MBT # 25553 DoD 4 - 43
Piper Cub 1944 L4H 480015 G-AKIB
1942 CHEVROLET G506 CARGO. #2NM 213219
1943 AUSTIN LIGHT UTILITY M6448770
- tamnalan
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Re: Windshield brace
Thanks Rod - you sure have some nice cars!
Alan W. Johnson
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
- JIMN
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Re: Windshield brace
I don't think I have ever experienced in a jeep what you are trying to solve, or maybe I just drive slower.
Are you saying the windshield frame is flexing, or are you saying there is an annoying deep pulsating/thumping sound of the wind? or both?
Are you saying the windshield frame is flexing, or are you saying there is an annoying deep pulsating/thumping sound of the wind? or both?
1941 Ford GP, 1944 Willys MB, 1943 Bantam T3
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Re: Windshield brace
This is an MB/GPW problem exacerbated by the loose fitting A-3216 Top with no rods to stiffen the sides. The stronger CJ-3A and M-38 Windshield cured that. Similar CJ-2A had rigid rods attached to bows and windshield frame that prevented that.
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- W. Winget
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Re: Windshield brace
I always ride with the windshield opened about 3-4 inches, (enough to still open the hood without it ever hitting the windshield) this allows air to flow through and not have wind hitting me behind my head as much when I drive.
Much easier than adding devices, open the windshield frame a few inches and it should reduce the stress on the whole windshield frame your stressing about .
V/R W Winget
Much easier than adding devices, open the windshield frame a few inches and it should reduce the stress on the whole windshield frame your stressing about .
V/R W Winget
- tamnalan
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Re: Windshield brace
Thanks, yes I already do that.
Alan W. Johnson
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
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- Jeep Heaven
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Re: Windshield brace
Don't swallow any hornets or June Bugs.
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LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
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Re: Windshield brace
Looks like a simple solution to strengthening the windshield frame to me! Especially if you drive or tow with the top on at higher speeds it should help
Having the windshield open 3-4" at the bottom really does help the buffeting and air wrapping around and hitting your head, No bugs for me, and I often drive at 60 mph + with my overdrive.
Having the windshield open 3-4" at the bottom really does help the buffeting and air wrapping around and hitting your head, No bugs for me, and I often drive at 60 mph + with my overdrive.
43 Ford GPW 92098
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- Chuck Lutz
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Re: Windshield brace
Hmmm...just how much "force" is exerted against that windshield anyway? To convert wind speed to pressure I think it works like this:
1) Square the wind speed (I used 45 mph for this exercise) 45 x 45 = 2025
2) Multiply result by 0.0027 to get pounds per sq ft. 2-25 x 0.0027 = 5.47 per sq ft
3) Windshield is 8 sq ft so...5.47 x 8 = 43.74 pounds of pressure against the windshield at 45 mph.
4) I suppose you could get buffeted by a semi going the other way at 65 mph and then get 92 pounds of pressure against the windshield.
5) If you were driving at 45 mph into a 20 mph headwind that would be the same result....92 pounds against the windshield.
6) in either scenario, divide that by the TWO arms on the windshield and you get maybe 25-50 lbs on each arm...roughly the weight of a suitcase allowance at the airport these days.
Personally I believe that people getting in and out of the jeep using the windshield as a grab handle exert a greater pressure than the wind does. We had to HEAT the arm cherry red and apply maybe 20-30 lbs of force using a 4' lever to bend the frame when we straightened the arms on a couple windshields.
1) Square the wind speed (I used 45 mph for this exercise) 45 x 45 = 2025
2) Multiply result by 0.0027 to get pounds per sq ft. 2-25 x 0.0027 = 5.47 per sq ft
3) Windshield is 8 sq ft so...5.47 x 8 = 43.74 pounds of pressure against the windshield at 45 mph.
4) I suppose you could get buffeted by a semi going the other way at 65 mph and then get 92 pounds of pressure against the windshield.
5) If you were driving at 45 mph into a 20 mph headwind that would be the same result....92 pounds against the windshield.
6) in either scenario, divide that by the TWO arms on the windshield and you get maybe 25-50 lbs on each arm...roughly the weight of a suitcase allowance at the airport these days.
Personally I believe that people getting in and out of the jeep using the windshield as a grab handle exert a greater pressure than the wind does. We had to HEAT the arm cherry red and apply maybe 20-30 lbs of force using a 4' lever to bend the frame when we straightened the arms on a couple windshields.
Chuck Lutz
GPW 17963 4/24/42 Chester, PA. USA 20113473 (USA est./Tom W.)
Bantam T3-C 1947
GPW 17963 4/24/42 Chester, PA. USA 20113473 (USA est./Tom W.)
Bantam T3-C 1947
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Re: Windshield brace
Co-efficient of drag needs to be added, multiply by 2.0 for a flat plate, probably a little less due to the angle, though. If you really want to get into it, you need to account for the wind gusts and height above the ground.
http://www.wikihow.com/Calculate-Wind-Load
http://www.wikihow.com/Calculate-Wind-Load
Last edited by Marty, SoCal on Sat Feb 11, 2017 5:28 am, edited 1 time in total.
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
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Re: Windshield brace
An A-3216 Top at 45-50 MPH is rough on an MB/GPW Windshield Frame, one can see the flexing in the cowl area. The windshield frame will let go before a properly made canvas with secure grommet installation.
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Re: Windshield brace
Another worry is how much rust is inside the 70+ year old frame tubing, hidden from view
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
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