TOPIC: SR71 1:10 SINGLE TURBINE

SR71 1:10 SINGLE TURBINE 01 Jun 2018 22:44 #586

  • Robin Colbourne
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Just a thought regarding the drag chute. If you had a bungee between the aircraft and the chute, or a winch to pull the chute in when the model slows, the chute would be going faster than the model and produce more drag for longer at the slower end of the landing run. You would need to deploy the chute a bit earlier to get the bungee stretched or to pay out the line that you then winch in.

As for the brakes, hydraulic disc brakes are available for model cars. They should do the job.
Model Car Disc Brakes
Last Edit: 01 Jun 2018 22:45 by Robin Colbourne.
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SR71 1:10 SINGLE TURBINE 02 Jun 2018 11:50 #587

  • bond007mas
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Thanks for your comments Robin, i have installed the hk drum brakes but those disk brakes do look good, they look like they are driven by air?
As for the chute, i have an old flare chute, it would be ideal, and to scale, but having a central turbine it just wouldn’t work, I would love to have a chute, i really would but the heat, even at 10ft would too much, sorry
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SR71 1:10 SINGLE TURBINE 02 Jun 2018 22:15 #588

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Rob where would the pressure for the disc brakes come from?
Anything will fly give n enough power
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SR71 1:10 SINGLE TURBINE 03 Jun 2018 07:05 #589

  • Eric
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O.T. - if you look at the photo, there are two calipers and a master cylinder. :evil:
The master cyl is driven by a servo via the clevis (the forked bit on the right), and the plumbing (not shown, but the connectors are) conducts the brake fluid pressure to the calipers, just like on a 'real' car, or a motorbike.
if you are calm and collected when all about you are going berserk - you've missed something important!
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SR71 1:10 SINGLE TURBINE 03 Jun 2018 14:36 #590

  • Quorneng
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My concern is more that a conventional servo has proportional movement whereas what any brake system needs is a proportional pressure applied.
About the only way I can see this working correctly is if the system has some hydraulic "give" built in so the pressure generated is indeed proportional to the master cylinder movement.
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SR71 1:10 SINGLE TURBINE 03 Jun 2018 18:04 #591

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Thanks Q I see it now. The only way I can think of providing a little give in the circuit is this. Somewhere in the circuit you would need to add a flexible link such as a rubber tube which will expand a little under pressure.How much would need to be determined by experiment I suppose. Either that or spring loaded chamber or cylinder. or similar arrangement to give a little under pressure..
Anything will fly give n enough power
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SR71 1:10 SINGLE TURBINE 07 Jun 2018 09:16 #592

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Hi guys, sorry for the delay on the maiden, the pilot is ill, and work, hope to have some news soon, it’s ready to go
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SR71 1:10 SINGLE TURBINE 07 Jun 2018 11:03 #593

  • Robin Colbourne
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Quorneng wrote:
My concern is more that a conventional servo has proportional movement whereas what any brake system needs is a proportional pressure applied.
About the only way I can see this working correctly is if the system has some hydraulic "give" built in so the pressure generated is indeed proportional to the master cylinder movement.

Quorneng, you are right about the need for proportional pressure, however this is easily achieved by having a spring between the servo and the master cylinder. This is also common on engine powered R/C buggies, which have a mechanical disc brake on the drivetrain actuated when the throttle is closed. As the engine has a centrifugal clutch, you don't get the engine braking that you would in a full-size car.
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SR71 1:10 SINGLE TURBINE 07 Jun 2018 11:25 #594

  • insomaniac45
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If you look at how RC cars brake via the output shaft of the motor, (old nitros) they have a pull type brake, where a compression spring is fitted. This would be easy to make up to apply force to the master cylinder.
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SR71 1:10 SINGLE TURBINE 12 Jun 2018 09:11 #595

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Had another taxi run yesterday, all went well. BRAKES WERE OK, hooraaahhh.
I did it full weight (full tanks/winglets/lights). It shifted c of g so i will have to shift the battery for the lights to the nose instead of the receiver bay.
I wanted to do it straight away but only got 1 taxi for 5 mins, my pump for kero broke so will have to fix it.
All was ok, everything worked :)
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SR71 1:10 SINGLE TURBINE 12 Jun 2018 15:47 #596

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Glad brakes O.K. Now for a maiden eh?
Anything will fly give n enough power
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SR71 1:10 SINGLE TURBINE 15 Jun 2018 11:58 #597

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When i get chance.
I’ve fixed the pump, it was electrical.
I’ve got to rewire battery to adjust c of g now
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SR71 1:10 SINGLE TURBINE 21 Jun 2018 08:59 #598

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Have put the battery and braincube activation box in nose.
Lighting system finished, just need to be painted, works well, will put it on YouTube when i get the chance.
I will try for Monday for maiden
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SR71 1:10 SINGLE TURBINE 21 Jun 2018 21:07 #599

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Here it is
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