B737 Winshield wiper operating limits.
 

Whats the Speed beyond Windshield wipers will not operate.If there is Any.
Normally Wipers will be used during Takeoffs & Landings.
But If used at Cruise will they function with the Airloads.
regds
HAWK.

In our technical manuals there i no reference to any speed at which not to use the wipers any more.

Just curious why you would need to use them in the cruise? At the speed at which you're flying, the windshield will be dried by the air rushing around it anyway....

The reason was I wanted to know Will the motor convertor unit operate against greater Airloads.
regds
HAWK.

Judging by how bl00dy useless they are on finals and take off I can't think why anyone would want to use hem anyway!!

Mr Porsche and Mr Ferrari have sorted out hi speed wipers but Mr Boeing has a lot yet to learn.

Boeing has improved them on the next generation aircraft. They even have an interval position on the switch and they are virtually silent.

Hi Hawk,

We never really need the wipers above about 210 kts (clean speed) because at higher speeds the rain is blown away. Also above 210 you are not usually at a critical phase of flight for looking out of the windows, ie near decision height or below. If it is raining then you are generally heads in flying on your instruments. I have tried to park them at higher speeds to stow them a bit lower down, but they usually end up worse perhaps because of the increased aerodynamic load. BTW they are so incredibly noisy and distracting most people prefer to leave them off unless the view is really impaired. Great pity they are withdrawing the rain repellent, that worked a treat and was silent.

S & L

The Rain repellant has been replaced by a Hydrophobic coating on the #1L & #1R windows on the B737s.
It operates as if the repellant has been sprayed.
regds
HAWK.

BWahahaha :D

Sorry, obviously you haven't used rain repellant, or the "Hydrophobic" stickers on our windscreens are just that - stickers only!

Rain repellant is ten times better than hydrophobic screens!

One point to watch out for, the motors on the 2/3/4/500 have overheat switches in them, if they are used for extended periods on dry(ish) windscreens they can get too hot and cut out. They do self reset after a cooling down period. About the time we get called out to "Operational check carried out, No Fault Found" Doh!

I'm glad to see the back of rain repellant!!
Typical top sheet..."Windscreens require cleaning"
You try to get boeshield off :mad:
Coke don't work no more :(

Spannerhead. You were probably using Diet Coke. Much weaker solution...

Oh yes, we’ve had some trouble with the 737NG wiper. Modified units are doing better. Out of curiosity, anyone know if any airplane (possibly smaller airplanes) use compressed air directed towards the windshield, instead of wind-shield wipers? I would guess in combination with rain repellant.

I’m not aware of any myself, but a colleague indicated some airplane did, without being able to confirm which type of airplane.

English Electric (BAC) Lightning interceptor used HP compressor air via a fish tail onto the base of the windscreen. Most effective unless you were the poor QFI in the right hand seat of a trainer when the student bottled out in a strong crosswind and rain 'cos the R/H screen did not have it!

I know..............:eek:

Stab Trim,

If I recall, the DC8 used air instead of wipers.

The Next Gen wiper motors have overheat switches in them as well. There was a modification done on them a couple of years back. The mod wasn't to the motors (at least ours wasn't), but thw iring associated was modified.

Boeshield
 

Is Boeshield really used as rain repellent? I'm an avid cyclist (mountain and road), and Boeshield T-9 lube is the best there is. I use it to lube the chain and cables as well as a frame polish/protectant.



-WN

operating speed?
 

from taxi to V ref plus 20 kts maximum? i agree with the other post...why would you want to put it on at CRZ?

just curios you understand? not meaning to start anything here.

F-----g MEL says can go with either low/high speed inop. But if on high and hardly moves than what?! Only way line up and if u feel dey dont do d job just take d bird back to d guy who send u off...:)

Which A/c
 

Citation Bravo uses Windscreen Bleed Air!

C-141 used ducted air instead of wipers as well, if I recall correctly...

Dave