Martyn K Posted October 1, 2012 Share Posted October 1, 2012 I offered to do a reduced size plan for Hanno Prettners 1977 W/C winning Curare F3A design. One other person has said they would like to build one. Anyone else interested in this as a build project? Basically it is 45"(ish) span with a target AUW of 1.5kg. It will be designed around an SC25 but I guess that a hot 20 or FS 30 would also be OK. I am doing the drawings using Draftsight as an educational exercise and am sticking very (very) close to the original shape and layout. However, there will be a few structural changes to try and keep the weight down - for example an unsheeted tailplane, partial sheeted wing, fixed U/C and no flaps. Prospective builders will be expected to do a bit of work themselves, the drawing will not have full constructional details although ribs, formers, spars etc will be properly documented Before I publish anything though, out of courtesy I think that I really need to let Hanno know what I am doing. If anyone has any contact details for him, please PM me. If you don't think that is necessary, please let me know. I hope to get the plans completed before then end of October. Best wishes Martyn Quote Link to comment Share on other sites More sharing options...
Pat (rActive) Harbord Posted October 1, 2012 Share Posted October 1, 2012 I'm interested. I rember Prettner and Wolfgang Matt from when I was 7-8 in the 70's. would love to have a look at the plan with a view to an electric conversion (if that's ok) my dad was inspired to bring a kit similar to the curare back from a trip to the USA, can't remember seeing it fly though. I do remember the paint job was immaculate red white and deep blue. Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 1, 2012 Author Share Posted October 1, 2012 No problems. I think that I have found Hanno (on Facebook) and PM'd him. Hopefully, he will be OK with it. Regarding electric conversion, the internal fus width is 49mm (and that is stretched by about 5% from the original). Battery space will be the limiting factor I think. Martyn Edited By Martyn K on 01/10/2012 22:36:15 Quote Link to comment Share on other sites More sharing options...
Chris Poulton Posted October 2, 2012 Share Posted October 2, 2012 count me in please.. Quote Link to comment Share on other sites More sharing options...
Dave Bran Posted October 2, 2012 Share Posted October 2, 2012 Subscribed! Quote Link to comment Share on other sites More sharing options...
Pat (rActive) Harbord Posted October 2, 2012 Share Posted October 2, 2012 Posted by Martyn K on 01/10/2012 22:35:40: Regarding electric conversion, the internal fus width is 49mm (and that is stretched by about 5% from the original). Battery space will be the limiting factor I think. super slim could think about 2, 2 cell packs connected in parallel (2S2p) so I could feed them into the fuse or go in series (4S1p) for lots of punch Have to have a look when we know the AUW and wing loading Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted October 2, 2012 Share Posted October 2, 2012 Count me in please Martyn. Quote Link to comment Share on other sites More sharing options...
Reno Racer Posted October 2, 2012 Share Posted October 2, 2012 count me in Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 2, 2012 Author Share Posted October 2, 2012 Nothing heard from Hanno yet Here is a taster.. Click for a larger image.. Best wishes Martyn Edited By Martyn K on 02/10/2012 22:56:58 Quote Link to comment Share on other sites More sharing options...
Ian Jones Posted October 2, 2012 Share Posted October 2, 2012 Good luck with this project, I'll be watching . Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 2, 2012 Author Share Posted October 2, 2012 Thanks Ian, I am trying to get this well under way before the mass build starts, plus I am hoping to get the Webbit finished in the next couple of weeks then repair the AstroHog 25 - looking in a very sorry state - the only salvagable thing is the fuselage Just to add to the work load (not really work, I enjoy this stuff), but the shed has sprung a couple of leaks.. Oh - and try and get some flying in as well.. Martyn Edited By Martyn K on 02/10/2012 23:06:07 Quote Link to comment Share on other sites More sharing options...
TinPot Pilot Posted October 3, 2012 Share Posted October 3, 2012 Good luck Martin I'll be watching but not sure if I have enough skill to build it! Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted October 3, 2012 Share Posted October 3, 2012 Just adding a post so I can follow along Martyn...... Small models seem to be having a bit of a renaissance in the Hargreaves Workshop just now & I've always liked the Curare so a 25 powered version would be very nice..... Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted October 3, 2012 Share Posted October 3, 2012 You do realise that this means I need to source a new piston and liner for my clapped out OS 25 FSR? ps - MK did some 20 size aerobats as kits, I think they included the Curare, and I remember seeing a PDF plan for a 10 sze one on RCG but that used a foam wing. Hmmm - mini retracts? Edited By Bob Cotsford on 03/10/2012 10:45:33 Quote Link to comment Share on other sites More sharing options...
Jimbo565 Posted October 3, 2012 Share Posted October 3, 2012 Steve. Check your PMs Jimbo Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted October 3, 2012 Share Posted October 3, 2012 Nothing there Jimbo..... Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 3, 2012 Author Share Posted October 3, 2012 Posted by Bob Cotsford on 03/10/2012 10:32:48: You do realise that this means I need to source a new piston and liner for my clapped out OS 25 FSR? ps - MK did some 20 size aerobats as kits, I think they included the Curare, and I remember seeing a PDF plan for a 10 sze one on RCG but that used a foam wing. Hmmm - mini retracts? Edited By Bob Cotsford on 03/10/2012 10:45:33 Hi Bob I am aware of a 40 sized Curare, but that is the only one that I know of (apart from the original). Mini restracts are an option - I discounted them because I tend to land a bit on the heavy side and on a grass strip. I also try to keep cost, weight and complexity down. However, if you can identify some and get me some measurements or better a 3 view, I'll look at incorporating them. Martyn Edited By Martyn K on 03/10/2012 21:24:50 Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 3, 2012 Author Share Posted October 3, 2012 Posted by TinPot Pilot on 03/10/2012 00:25:11: Good luck Martin I'll be watching but not sure if I have enough skill to build it! Have a go at it, there will be enough people here who will give you a hand if you get stuck. I am hoping that the material costs will be less than £30 (plus hardware). Martyn Quote Link to comment Share on other sites More sharing options...
Andy Green Posted October 3, 2012 Share Posted October 3, 2012 Hi Martyn. Just a post to keep an eye on this one. I'm building an original sized one, so interested in how you get on. Andy Quote Link to comment Share on other sites More sharing options...
Chris Poulton Posted October 3, 2012 Share Posted October 3, 2012 to my mind the Curare just HAS to have a trike undercarriage, not like some pics i have seen of some reincarnations on the web. hobbyking does some small light electric retracts but not sure there is enough space in the nose for a tank and retract unit. I have a new asp 25 looking for a home, and just engines have a nice 20 size tuned pipe and manifold for £45......sure sounds like (another) winter project for me. Martyn if you can pm me a full size drawing of the nose section up to say half way down the wing chord, showing the intended noseleg position i will measure to see if the retract unit and steering servo can fit as i have a set bought for another project. by the way, there was in fact a Curare 20 kitted by mk many many moons ago. anyone with an unbuilt kit can become wealthy by selling it. 10 mins on google will reveal some info. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted October 4, 2012 Share Posted October 4, 2012 Thanks for stepping in with the measurements Chris, the HK units are what I was thinking of. It's a bit bigger, but I've been messing with a part completed unidentified 80's airframe that looks 40 size, and I think it would be easier to fit a retract unit than a steerable nosewheel at that scale as the radial mount gets in the way. Remember the wheel doesn't need to disappear completely, just so long as the retract unit can be flush with the underside then half the wheel sticking out won't be noticable. Leg length may be more of a sticking point in order to get sufficient height yet short enough to fit in front of the wing when retracted. Martyn, you provide a plan, wee'll (wheel?) come up with work-arounds! Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted October 4, 2012 Share Posted October 4, 2012 I think that retracts, whilst looking good in the air will bring more disadvantages than advantages. The extra cost, complexity & weight wouldn't justify the improved appearance in the air IMHO. A fixed trike undercarriage will be fine...... Just my 2p..... Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 4, 2012 Author Share Posted October 4, 2012 Hi Steve I am inclined to agree.. however, if someone send me a link to the retracts that are required, I'll take a look at how they could/should be mounted. bw Martyn Quote Link to comment Share on other sites More sharing options...
Chris Poulton Posted October 4, 2012 Share Posted October 4, 2012 Try this Martyn. I believe this is the set I have. **LINK** Quote Link to comment Share on other sites More sharing options...
edwards flyboy Posted October 4, 2012 Share Posted October 4, 2012 Martin, most interested ,have just finished the Bird Dog free in this months Model World and this wopuld be a nice next build. Quote Link to comment Share on other sites More sharing options...
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