The Barracuda Project

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riding shotgun
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Re: The Barracuda Project

Post by riding shotgun » Thu May 01, 2014 8:45 pm

Thanks for the reply, it is true there is a lot to still do but there has also been a lot achieved.

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Renegadenemo
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Re: The Barracuda Project

Post by Renegadenemo » Sun May 04, 2014 9:45 pm

it is true there is a lot to still do but there has also been a lot achieved.
'tis true to say that we've knocked together a decent piece of aeroplane - nearly. But we're still short of a wing so the search is on to find more spare parts.
In the meantime the rest of our rivets have arrived to put the last skin on lefty so that'll be going on next week.
I'm only a plumber from Cannock...

"As to reward, my profession is its own reward;" Sherlock Holmes.

'Sometimes you gotta be an S.O.B if you wanna make a dream reality' Mark Knopfler

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Piston Broke
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Re: The Barracuda Project

Post by Piston Broke » Sat Jun 07, 2014 8:12 pm

Just uploaded the latest Barra diary


Latest Barra Diary
If it can't be fixed with duck tape it can't be fixed
There is a very fine line between "hobby" and "mental illness"
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Renegadenemo
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Re: The Barracuda Project

Post by Renegadenemo » Sat Jun 07, 2014 9:33 pm

Yeah, hadn't really thought about the tailwheel but now that it's done I reckon we can be well chuffed with that. John and I have been messing with it for a couple of weeks prepping and un-seizing parts and it built up really well. Filling it to 400psi seemed a little scary so me, being unable to count, let it down from 700psi once my mistake was realised!
I'm only a plumber from Cannock...

"As to reward, my profession is its own reward;" Sherlock Holmes.

'Sometimes you gotta be an S.O.B if you wanna make a dream reality' Mark Knopfler

wbjohn
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Re: The Barracuda Project

Post by wbjohn » Sat Jun 07, 2014 9:44 pm

I've enjoyed the change the last couple of weeks, been good to strip and rebuild an item to working order.
It's not every day you get to be involved with the team working on the only functioning Barracuda Olay.

kneeslider
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Re: The Barracuda Project

Post by kneeslider » Sun Jun 08, 2014 12:44 am

Just a thought, never having seen a real, live Barracuda tailwheel, but the curious workings you refer to in the discription of the tailwheel could be a tailwheel lock?

These are installed on a few tailwheel aircraft, and enable the intrepid pilot to lock the tailwheel to the motion of the rudder, or let it caster, and point where it likes.

The motion is usually achieved with a pin that drops into a detent on the Oleo, and is operated by way of a cable to the cockpit.

In could be wrong however, but to looks rather similar to a smaller item fitted to a Bolkow D207 that belongs to a mate.

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mtskull
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Re: The Barracuda Project

Post by mtskull » Sun Jun 08, 2014 5:26 am

Nice work.

Why on earth is it called an Oleo? Here's why: "Oleo" is simply an abbreviation of "oleo-pneumatic", which is a fancy way of saying that your strut has oil and air in it. (They probably did use air back in the 1940's but as your tailwheel is going to sit around in a museum for many more years than the anticipated life span of your average Barracuda, you might be better of to adopt modern practice and charge it with nitrogen).

Does the strut actually incorporate a hydraulic damping element? -If not, then strictly speaking, it isn't really an oleo at all, but a plain old pneumatic strut, which is a shame because you would then have to put all of the ladies' cosmetics-based humour on hold until you get round to the main undercarriage legs. ;)

By the way, your second trim-tab-type-thing on the elevator is a servo tab. By moving in the opposite direction to the elevator, it works like a little elevator of its own and generates an aerodynamic force that assists the movement of the elevator, thus reducing the effort required at the control column. A clever yet simple device which you will still find in use today.

Right, that's enough smart-arseness for the time being. i'm going to try to get back to sleep now.
Obstacles are those frightful things you see when you take your eyes off your goals.

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mtskull
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Re: The Barracuda Project

Post by mtskull » Sun Jun 08, 2014 6:05 am

kneeslider wrote:Just a thought, never having seen a real, live Barracuda tailwheel, but the curious workings you refer to in the discription of the tailwheel could be a tailwheel lock?

These are installed on a few tailwheel aircraft, and enable the intrepid pilot to lock the tailwheel to the motion of the rudder, or let it caster, and point where it likes.
Quite a good pic here showing a Barracuda tailwheel doing exactly that:
http://www.airliners.net/photo/UK---Nav ... 403c6d9fe6
Obstacles are those frightful things you see when you take your eyes off your goals.

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Richie
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Re: The Barracuda Project

Post by Richie » Sun Jun 08, 2014 8:00 am

It's filled with oil and air.... So it's an oleo :D
Clarence come out ov zat tank at vonz !

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mtskull
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Re: The Barracuda Project

Post by mtskull » Sun Jun 08, 2014 8:12 am

Richie wrote:It's filled with oil and air.... So it's an oleo :D
Excellent; so the torque link gets to continue to be called a Clarins, then. :lol:

I would be interested to know how that tailwheel lock works; it isn't clear from the photos. Have you got any piccies of it the other way up?
Obstacles are those frightful things you see when you take your eyes off your goals.

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