RamsonGomes
Topic Author
Posts: 1
Joined: Mon Oct 28, 2019 10:24 am

Why do planes with propellers only start one while leaving the gate?

Mon Oct 28, 2019 10:33 am

I've been taking a lot of flights the last month, and I've been on some smaller passenger planes that have open propellers on their wings instead of covered jets (If that makes sense?)

Every time I notice a plane like that leaving the gate to go to the runway, they only turn of the propeller on the opposite side that people enter on. Is there a reason for that or just a weird coincidence?
 
VSMUT
Posts: 3253
Joined: Mon Aug 08, 2016 11:40 am

Re: Why do planes with propellers only start one while leaving the gate?

Mon Oct 28, 2019 12:36 pm

2 things:

First, it is a fuel savings measure. If you have to taxi far, it will save you a great amount.

Second, for ATRs, you can run the right hand engine without spinning the propeller. This is the "APU" for ATRs. Since all the crew needs to do is release the propeller brake and push the condition lever forward, it is often convenient to just get moving before you letting it loose.
 
citationjet
Posts: 2518
Joined: Sun Mar 09, 2003 2:26 am

Re: Why do planes with propellers only start one while leaving the gate?

Mon Oct 28, 2019 1:18 pm

Jet aircraft also often taxi with one engine off. The difference is that it is not visible with jet aircraft.
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asr0dzjq
Posts: 86
Joined: Tue Oct 29, 2019 2:36 am

Re: Why do planes with propellers only start one while leaving the gate?

Thu Oct 31, 2019 12:03 pm

citationjet wrote:
Jet aircraft also often taxi with one engine off. The difference is that it is not visible with jet aircraft.

Unless you can see the engines from the front.
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atomicstar
Posts: 94
Joined: Mon Apr 15, 2019 10:10 pm

Re: Why do planes with propellers only start one while leaving the gate?

Thu Nov 07, 2019 12:04 am

Jet aircraft also does this often. This saves fuel and reduces engine wear, by taxiing with one engine. Also on certain regional aircraft with rear mounted engines and cargo door at the back (such as certain Bombardier CRJ), this gives more time for the engine to cool down so crew standing near it won't feel the air being so hot while unloading.
 
remingtonbox
Posts: 23
Joined: Sun Sep 12, 2010 12:44 am

Re: Why do planes with propellers only start one while leaving the gate?

Thu Nov 07, 2019 12:45 am

VSMUT wrote:
2 things:

First, it is a fuel savings measure. If you have to taxi far, it will save you a great amount.

Second, for ATRs, you can run the right hand engine without spinning the propeller. This is the "APU" for ATRs. Since all the crew needs to do is release the propeller brake and push the condition lever forward, it is often convenient to just get moving before you letting it loose.


Thirdly, the engine is started opposite of passengers, because passengers are very unaware and have a high likelihood of walking into a spinning propeller. I do the same thing in the corporate world.
 
snasteve
Posts: 81
Joined: Sun Dec 01, 2013 1:58 am

Re: Why do planes with propellers only start one while leaving the gate?

Thu Nov 07, 2019 5:56 am

Some aircraft produce significant power with all of their engines running idling. Enough so that it requires constant use of the brakes to keep the plane from rolling too fast around the taxiways.

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