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Reverse Airflow by Turning Fan Blade 180 Degrees

F

FarmerHR

Member
One of my elderly farm friends mentioned to me
that when they were brush hogging with an N series
tractor, it was standard practice to turn the fan
180 degrees. This causes the cooling air to come
out the front of the radiator. He claimed that
this practice prevented the radiator from plugging
with weeds, seeds etc. They turned the fan back
to its normal position after the bush hogging was
finished.
Has anyone heard of this ? Is it a good practice
? Thank you for your usual excellent help.
 
That doesn't work.

The airflow remains the same, the fan is just less efficient mounted backwards.

They DID, however, make a reverse-pitch fan to reverse airflow.
 

A friend has a Dresser TD-7 that has the reversible fan. Each blade is on a shaft that has a spring loaded lock that enables it to be twisted 180 degrees.
 
(quoted from post at 09:24:00 12/15/14)
A friend has a Dresser TD-7 that has the reversible fan. Each blade is on a shaft that has a spring loaded lock that enables it to be twisted 180 degrees.
Click to expand...
80?
 
We get the same effect by resetting the distributor and running the engine backwards, which also reverses the fan. Only disadvantage is that you only have one forward speed, but you also get a much lower reverse.
 
Fact is if you flip the fan blade it still pulls/pushes the air the same way but does not do it as good. Find and old fan and flip the blades on the fan and guess what the air still goes the same way just not as much
 
" One of my elderly farm friends mentioned to me that when they were brush hogging with an N series tractor, it was standard practice to turn the fan 180 degrees. "

Well, as others said, it won't work.

But, more to the point.....

Look at the pic & try & figure out how " it was standard practice to turn the fan 180 degrees".

The blade is riveted to the hub. Assuming someone actually drilled out the rivets & replaced them w/ nuts & bolts, you'd still need to remove the fan from the tractor to reverse the blades.

Seriously?
IMG_20141215_110921_336_zps78bb6005.jpg

75 Tips
 
(quoted from post at 07:37:26 12/15/14)
(quoted from post at 09:24:00 12/15/14)
A friend has a Dresser TD-7 that has the reversible fan. Each blade is on a shaft that has a spring loaded lock that enables it to be twisted 180 degrees.
Click to expand...
80?
Click to expand...

Yes, if you were standing looking in one direction and pivoted 180 degrees you would be facing the opposite direction. Right? On 'dozers it was done so that warm air helped warm the operator in cold weather and the hot air was blown away from the operator in warm weather.
 
Just my guess here...
I think what he's getting at is looking Bruce's photo the blades are turned about 30°.
So to reverse direction you would turn them about 60°.
 
The other advantage to doing this is that it decreases pollution by pulling in ambient air into the exhaust and filling up your gas tank with reverse-cycled gasoline. Better yet it has no ethanol in it.
 
Ford offered both types of fan blades as I found out when I took my newly restored 1941 to a show in the winter time. It was an inside show and there was a line to get in the door and I was freezing so I got off with it running and walked in front. Warm air was blowing out the front.

Thinking I had put the fan blades on backward I asked a long time Ford collector who told me both were offered by Ford. The reason was exactly as stated an effort to keep debris from plugging the radiator. We can argue that it would not work but it was still offered.
 
Thank you, Ultra Dog!! You nailed it!! I've seen dozer fans that you pushed in on the blade to unlock it, rotated it about 60 degrees or so and it'd lock back in a seat when oriented correctly/released. Some folks just don't look at the whole picture, only what they want to see/hear!!
 
I wonder what would happen with half of the blade in each position... make a lot of noise, and not move much air???
 
(quoted from post at 20:18:51 12/15/14) Blades are angled the opposite direction on a pusher fan.

mvphoto13980.jpg
Click to expand...

I used to put a pusher fan on my winter tractor because at zero degrees, I don't want ANY air blowing on me. LOL

With the constant Great Lakes winds here and freezing temps,
this January I might just take the fan off my snow tractor and throw it in the corner.....who needs it
 
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