Flyingboat at Woodvale

[Guest]

Sounds like a versatile show' date='was that the chap with the Merlin strapped to a chassis,I bet that made a din ? I believe he has few Merlin engines of different marks.[/quote']yea its bolted to a trailer or the one i saw was

there was 2 engines on trailers a merlin and another possibly a differant mk

they only ran the merlin though

was pretty noisey

[Guest]

One of the engines on a trailer shown in the newspaper was contra-rotating prop type, only saw front view so no idea what it was. Thanks for info on Short flying boat model, we`ll find out in the magazine report about it and the builder.

[Guest]

One of the engines on a trailer shown in the newspaper was contra-rotating prop type' date=' only saw front view so no idea what it was. Thanks for info on Short flying boat model, we`ll find out in the magazine report about it and the builder.[/quote']maybe a stupid question but what is a contra-rotating prop type?

:thinking:

[Guest]

maybe a stupid question but what is a contra-rotating prop type?:thinking:

From a single engine the shaft goes into a gearbox which drives two outputs one inside the other, exactly the same as a clock hand arrangement. The differrence being that one rotates one way ond the other in the opposite direction. Each is connected to a propeller, one arranged behind the other so you end up with two concentric props rotating in opposite directions.

The big plus is that it does away with the massive torque reaction generated with a large heavy single prop but the downside is the losses in the gear box and the loss of reliability of the complex arrangement.

The most common that springs to my mind is the Fairey Gannet but I am sure Barry knows many more.

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[Guest]

One of the engines I think is a griffon. A follow on I think, from the Merlin. It was perhaps used on the "newest" Spits or maybe the Sea Fury?

Barry can you enlighten us?

Contra-rotating. Two props on two shafts, one inside of and longer than the other, driven by the gearbox/s configured to rotate shafts clock wise, and anti-clock wise. Quite a few Aircraft use this type of prop drive.

[Guest]

You must have been typing faster than me Richard.

The sound of the Merlin is ok. Not quite what is heard from a flying Spit.

[Guest]

One of the engines I think is a griffon. A follow on I think, from the Merlin. It was perhaps used on the "newest" Spits or maybe the Sea Fury?Barry can you enlighten us?

Contra-rotating. Two props on two shafts, one inside of and longer than the other, driven by the gearbox/s configured to rotate shafts clock wise, and anti-clock wise. Quite a few Aircraft use this type of prop drive.

thats it i think

the griffon and the merlin

if its not the griffon i must have saw that at leuchars air show cos it springs to mind

i have seen one of those contra rotating engines on that plane

i have a photo of it that my dad took somewhere