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Starting A Multi Engine Seaplane  
User currently offlineElpinDAB From United States of America, joined Apr 2005, 479 posts, RR: 4
Posted (7 years 10 months 1 week 3 days 22 hours ago) and read 4987 times:

Hey

I remember back when I got my seaplane rating, one of the most interesting things is that the second the engine turns over after you start it, you are moving along the water, even at idle power. Because of that, I've always wondered what the procedure is to start a multi engine seaplane. Does it have to be done on land, or can it be accomplished in the water also without undesirable results? (I guess I can't really think of any multi engine seaplanes that aren't amphibs...)

thanks.

7 replies: All unread, jump to last
 
User currently offlineWrenchBender From Canada, joined Feb 2004, 1779 posts, RR: 8
Reply 1, posted (7 years 10 months 1 week 3 days 21 hours ago) and read 4970 times:

The Twotter with the 12000 series floats is not an amphib, but part of the conversion was rigging the props with 'zero thrust latches' and setting up the throttles for that setting.
Therefore when you start, the props do not generate any thrust. The downside is they take forever to coast down on shutdown.

Notice that the props are at a 'flat setting'.

WrenchBender



Silly Pilot, Tricks are for kids.......
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 2, posted (7 years 10 months 1 week 3 days 21 hours ago) and read 4965 times:

I've pondered the same problem with a helicopter on floats.

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Photo © Ander Aguirre - AirTeamImages


The old problem of Newton's 3rd law and the tail rotor not yet developing enough thrust to counteract the torque on the main rotor as it winds up or down.



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User currently offline113312 From United States of America, joined Apr 2005, 572 posts, RR: 1
Reply 3, posted (7 years 10 months 1 week 3 days 12 hours ago) and read 4897 times:

I remember spending hours watching Grumman Gooses operating from a floating dock at Catalina Island during the 1960's. Since the boarding door was on the left side, they started the right engine first and allowed the plane to move forward until it was clear of the dock and personnel. Then they started the left engine.

User currently offlineBAe146QT From United Kingdom, joined Sep 2006, 996 posts, RR: 0
Reply 4, posted (7 years 10 months 1 week 3 days 12 hours ago) and read 4883 times:

Quoting 113313:
Since the boarding door was on the left side, they started the right engine first and allowed the plane to move forward until it was clear of the dock and personnel.

I'm trying to picture this. The asymmetric thrust from the right motor would tend to push it into the dock, I should think.

A quick peek at some pics seems to show that the Goose does not have little water rudders, (a-la the Cessna amphibious Caravan), and I can't imagine that the control surfaces have any sort of authority at low speed, any more than they would on any other aircraft.

Or did the floating dock come from *behind* the aircraft and stop at the door, IYSWIM? Bogus ASCII graphic below;


[] + <- Airplane here, facing up the page.
[]
[]
[]

This would mean it could move left as much as it wanted, I guess.



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User currently offlineDC8FriendShip From United States of America, joined Apr 2005, 242 posts, RR: 2
Reply 5, posted (7 years 10 months 1 week 2 days ago) and read 4736 times:

The other method is you could start the engines with props in feather ala PT-6's and move the props out of feather when it's time to move the plane.


Come fly the Friendly Skies of United
User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Reply 6, posted (7 years 10 months 5 days 18 hours ago) and read 4629 times:

Quoting WrenchBender (Reply 1):
'zero thrust latches'

Would that be the same as discing?


User currently offlineWrenchBender From Canada, joined Feb 2004, 1779 posts, RR: 8
Reply 7, posted (7 years 10 months 4 days 21 hours ago) and read 4545 times:

Quoting FLY2HMO (Reply 6):
Would that be the same as discing?

Yes, they are just a physical lock at the discing pitch setting. Spring loaded in, centrifigal force out.

WrenchBender



Silly Pilot, Tricks are for kids.......
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