Vecchio Austriaco Posted August 22, 2012 Share Posted August 22, 2012 Martin, not yet mine. Ordered an ARTF Curare 60 (see 1st picture) - should be out since March - but isn't for quality reasons. So I have to be either patient or build one myself. (workshop blocked with 2 other projects - so I wait) VA Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 22, 2012 Share Posted August 22, 2012 I would love to have a chat at the Nats and can be found in a LWB hi top white Transit usually parked as near to the hangar bar as possible. Martin Edited By Steve Hargreaves - Moderator on 23/08/2012 21:00:57 Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted August 23, 2012 Share Posted August 23, 2012 Your call Martin, there's the forum meet up at 2pm both days at the RCM&E tent too. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted August 23, 2012 Share Posted August 23, 2012 Martin, you might want to remove both your registration and mobile number from your posts for your own security - there are some strange people about who abuse these sort of things. I'm intrigued by your pipe - it looks almost as though it's got two outlets, one blocked off at the back plus one on the side? Also you u/c legs look very rigid, do you ever fly from grass with that setup? I've never tried a setup without a spring loop in the legs. Edited By Bob Cotsford on 23/08/2012 11:01:57 Quote Link to comment Share on other sites More sharing options...
Mark Powell 2 Posted August 23, 2012 Share Posted August 23, 2012 Beautiful. Beautiful. Beautiful. I can say no more. (But I do agree with Bob. Do it now) Edited By Mark Powell 2 on 23/08/2012 17:10:26 Edited By Mark Powell 2 on 23/08/2012 17:11:08 Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 23, 2012 Share Posted August 23, 2012 David Ashby. Perhaps you would be kind enough to remove my last post (with the phone No.). Thanks, Martin Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted August 23, 2012 Share Posted August 23, 2012 Done Martin....as the guys have said its best not to publish too much information on a public forum.... Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 23, 2012 Share Posted August 23, 2012 Thanks Steve, Martin Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 23, 2012 Share Posted August 23, 2012 Hi Bob, Took your advice thanks. The rear end of the pipe just has a screw which must hold it together-new one on me as well but I bought it with the motor. It also has a tube within a tube at the outlet which puzzles me. I never now use spring loops on retracts as they just cause them to bend back on take off from wet grass resulting in a stuck u/c. Don`t know why I ever did. Just use thicker wire. Oh to be able to fly from tarmac again. Martin. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted August 24, 2012 Share Posted August 24, 2012 I think that's a 'Genesis' outlet Martin. I can only imagine it is a form of restrictor to smooth the exhaust pulses on their way out. They are on pipes from both Weston UK and Just Engines. As for the legs, springs are a pain at times but I'd worry about ripping out the retracts with some of my landings if they weren't there Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 26, 2012 Share Posted August 26, 2012 The stress on take-off is backwards and on landing upwards so the springs do nothing at that time. It has surprised me a couple of times when I have had to do a belly landing that the legs were bent back. Must be that the force of a high speed take-off causes more bending than a usually much lower speed landing. Martin Quote Link to comment Share on other sites More sharing options...
Mark Powell 2 Posted August 27, 2012 Share Posted August 27, 2012 These loops on U/C legs are a thoroughly ineffective design. They only do it because it is simple and cheap. It puts all the bending load (and there is a lot) on the U/C mechanism. And the U/C leg, after a hard landing or a grass takeoff, never returns to its proper position, you have to 'adjust' the leg yet again. Even more often if you have doors attached to the leg. Leaving the loops out makes the load on the mechanism and its mount even higher, though you may 'get away' with it. . The vertical loads, on take off or landing, are so small compared to the bending loads that they can be completely ignored - see the way the U/C block breaks on all these naff ARTFs. Backwards, not upwards. on landing, not takeoff, so the bending load is higher on landing, though of course there are loads on takeoff too. Not that 'which is the highest' really matters, as you have to deal with the highest anyway. So I thought about it. On my Topflite Spitfire I mounted the U/C mechanisms each on its own strong plywood plate hinged to the main spar and free at the rear, between stops. Between the plate and the top stop is a strong spring (two, side by side if you can't find a single one strong enough - they have to be stronger than you might think). The U/C leg can move back under stress by about 2 1/2 inches but instantly returns to its exact proper forward position when the load is removed. Not difficult to do - the stops are mounted in much the same way as you mount regular U/C mounting blocks, except one above the other rather than horizontal, and its hinge is a 'regular' one from B&Q. Join the blocks together so the springs are not trying to split the ribs or tear out of the foam all the time. Particularly useful on grass. You can do it on a noseleg too. Did it on my Super Star. Did the same on my DH88 Comet racer twin too. That has 'backwards and forwards' retracts. Edited By Mark Powell 2 on 27/08/2012 04:56:36 Edited By Mark Powell 2 on 27/08/2012 05:00:01 Quote Link to comment Share on other sites More sharing options...
Phil 9 Posted August 27, 2012 Share Posted August 27, 2012 Mark can you show any photos or even a drawing sounds like a great idea Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 27, 2012 Share Posted August 27, 2012 Looks to be a good solution Mark. Pics. would be great. Martin Quote Link to comment Share on other sites More sharing options...
Omar Hazbon Posted August 31, 2012 Share Posted August 31, 2012 Hello Guys, I´m new in this forum. I used to fly my Curare back in the 80's. It was very nice to read these post and remember the "Golden Years of Pattern Flight". I´m thinking in building a new Curare and have fun again with this nice plane. I'm attaching a photograph of my first Curare wich uses a Webra 61 Speed engine with a Dynamix carburator and the tuned pipe was installed along the fuselage right side. My second Curare used a powerful, but heavier Supertigre X61 Rear Exhaust engine, but with internal modifications were necessary to Keep the CG in the right place. See you! Quote Link to comment Share on other sites More sharing options...
Andy Green Posted October 1, 2012 Author Share Posted October 1, 2012 I've started cutting wood, fuselage sides are done and the front formers. These are all 1/4" ply as I dont have any 3/32 ply. As with all my builds there will be more info and pic on my website Andy Quote Link to comment Share on other sites More sharing options...
Andy Green Posted October 18, 2012 Author Share Posted October 18, 2012 Slow start, but the fuselage is under way: Fuselage in the jig, the formers are glued using Araldite 24 hr, note the number of squares and clamps Andy Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted October 18, 2012 Share Posted October 18, 2012 You've only just started Andy & already I am jealous of your building skills..... Looking forward to seeing the end result.... Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 18, 2012 Share Posted October 18, 2012 Going to watch this with interest as well. That fuselage is very slim isn't it? Good luck Andy Martyn Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 18, 2012 Share Posted October 18, 2012 Andy Where do you get the long black trigger clamps from. I have been looking for a set for a while. Martyn Quote Link to comment Share on other sites More sharing options...
Andy Green Posted October 18, 2012 Author Share Posted October 18, 2012 You had me worried there Martyn, just checked the fuse to plan, and its spot on. The smaller clamps came from Tesco, and the larger ones from Macro. It was a few years ago now. Andy PS Thanks Steve. Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 18, 2012 Share Posted October 18, 2012 Thanks Andy I presume that you are going to use a radial mount rather than bearers. BTW - my XYL would not let me within 100 yards of a the dining table with any model.. Martyn Quote Link to comment Share on other sites More sharing options...
Andy Green Posted October 18, 2012 Author Share Posted October 18, 2012 I'm only allowed clean non smelly models on the table. Yes radial mount positioned 45 degrees ish such that the exhaust points straight down the fuse. A Edited By Andy Green on 18/10/2012 16:47:16 Quote Link to comment Share on other sites More sharing options...
Andy Green Posted November 2, 2012 Author Share Posted November 2, 2012 I prefer to have a servo close to the elevators ie no long control rod. I know its not to plan, but I dont have 1970's servo anyway nor a Webra Speed 61. This is a bit tricky on this model, because of the anhedral on the tail. The geometry is not suitable for a single servo, so I've had to use 2. The servos are Savox SH-0257. They have over 2Kg torque each so should be OK. They are positioned each side one with an arm up and the other with the arm down so the take off is in the same place for each elevator half. There will be a ply plate to support the servo. Wings arrived from Foamwings. Barry has done a superb job with these. Its going to be a real shame to cut into them. Andy Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted November 3, 2012 Share Posted November 3, 2012 Hi Andy, Those look nice wings. Mine are homespun and balsa skinned so yours may turn out lighter. My wing with pipe attached weighs 3.2lb all up. I would watch out for the CG position with those rear mounted servos though as I see that you are using the originanal type of construction with loads of 1" triangular. Mine is just a hollowed foam top deck and uses forward mounted servos. Having said that I did need to add tail weight. The complete fus. weighs 5.4lb. Good luck with your build, Martin Quote Link to comment Share on other sites More sharing options...
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