Delta Foxtrot Posted November 23, 2016 Share Posted November 23, 2016 So I guess you had the top and bottom spars glued in place and were using the blocks to hold the trailing edge in position and using the weight to keep the lower spar on the plan? Sounds like a good plan. I was wondering about attaching something to the front face of the blocks to fit snuggly on top of the spars. Scrap 1/4 balsa fitted using double sided tape or ideally an adjustable feature for different size spars, but your idea sounds nice and simple, I will give it a go. Posted by Gary Vinten 1 on 23/11/2016 12:29:26: Posted by Delta Foxtrot on 23/11/2016 12:21:37: Gary, I also invested in the magnetic blocks at the LMA show at Cosford last year. I was wondering how they coped when you attached the leading edge sheeting for the lower surface of the wing during your build. Is there enough force to firmly keep the spar clamped down as your raise the sheet up to the ribs for gluing, or did you pin it down. regards dave Hi Dave Yes there is I put the blocks up to the trailing edge the then pushed the blocks onto the sheet and put a weight on the structure to hold it down while it dried . The best thing I have in my tool box for years . I have built the whole model with these no more clunky slec building jugs and a lot less pins Gary Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted November 23, 2016 Author Share Posted November 23, 2016 Posted by Delta Foxtrot on 23/11/2016 12:52:22: So I guess you had the top and bottom spars glued in place and were using the blocks to hold the trailing edge in position and using the weight to keep the lower spar on the plan? Sounds like a good plan. I was wondering about attaching something to the front face of the blocks to fit snuggly on top of the spars. Scrap 1/4 balsa fitted using double sided tape or ideally an adjustable feature for different size spars, but your idea sounds nice and simple, I will give it a go. Posted by Gary Vinten 1 on 23/11/2016 12:29:26: Posted by Delta Foxtrot on 23/11/2016 12:21:37: Gary, I also invested in the magnetic blocks at the LMA show at Cosford last year. I was wondering how they coped when you attached the leading edge sheeting for the lower surface of the wing during your build. Is there enough force to firmly keep the spar clamped down as your raise the sheet up to the ribs for gluing, or did you pin it down. regards dave Hi Dave Yes there is I put the blocks up to the trailing edge the then pushed the blocks onto the sheet and put a weight on the structure to hold it down while it dried . The best thing I have in my tool box for years . I have built the whole model with these no more clunky slec building jugs and a lot less pins Gary I got 20 blocks when I got mine so my whole model was made using them all Quote Link to comment Share on other sites More sharing options...
MattyB Posted November 24, 2016 Share Posted November 24, 2016 Posted by Gary Vinten 1 on 23/11/2016 12:36:42: Posted by MattyB on 22/11/2016 23:56:26: I would need to work out the numbers on ecalc to be sure which I can't do on my phone, but I still wonder how you're getting to 1700W on a 200Kv motor, 6S pack and a 17x10 prop. Are you sure it is not a pitchier prop? I think you are going to be disappointed with the speed if your prop really does have a 10" pitch. On a fresh pack the max theoretical pitch speed is only ~45 mph; that's a thrust optimised setup more for a Cub or 3D model than a rocket ship! According to Overlander that motor can run an 18x10 on a 10S(!) pack, so a 17x10 is way under propped on 6S. If you are after speed a square or over-square prop would be a good bet; a 16x16 might be in the right ballpark. Even so I do wonder if your Kv is just too low for serious speed on 6S whatever prop you run. Edited By MattyB on 23/11/2016 00:14:07 Hi Matty I dont think there is a listing for the overlander motor on ecalc but iam sure I will get very near to what I want from this motor Gary ECalc used to allow custom motors in the free version, but looks like they removed that now. The only other free e-calculator I found gave a ridiculous result (max wattage of only about 300 on your setup), so unless I pay for eCalc I guess the theoretical max wattage value will remain a mystery. Not so the pitch speed though - 200kv on a 6s pack is a max rpm of ~4800, so on a 10" prop you have a max pitch speed of 45mph. Given drag losses you are probably looking at a max airspeed of only 40mph. I wish you luck, but suspect it's going to be like driving on the motorway in first gear on that prop... Edited By MattyB on 24/11/2016 00:11:51 Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted December 14, 2016 Author Share Posted December 14, 2016 Just a small update on the RIZLA+ Some riveting to do on the cowl but not far from the finish line Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted January 6, 2017 Author Share Posted January 6, 2017 Small update on the rizla + Quote Link to comment Share on other sites More sharing options...
Delta Foxtrot Posted January 6, 2017 Share Posted January 6, 2017 Looking good Gary. Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted January 19, 2017 Author Share Posted January 19, 2017 OK folks the finish line in site now Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 19, 2017 Share Posted January 19, 2017 Wow Gary wow. That is a beauty. Very inspiring Clean your lens too buddy, that flair in your photos is from a sheen making your lens dirty Quote Link to comment Share on other sites More sharing options...
MattyB Posted January 20, 2017 Share Posted January 20, 2017 Looks nice. I am intrigued to see how it performs on that very low Kv motor... Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted January 20, 2017 Share Posted January 20, 2017 Posted by MattyB on 20/01/2017 10:42:07: Looks nice. I am intrigued to see how it performs on that very low Kv motor... me too! My Curare has a 430kv motor on 6S and happily runs 12*12 or 12*10 props for 6/8 minutes from 4000 mAhr packs and I wouldn't class that as exceptionally fast. Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted January 20, 2017 Author Share Posted January 20, 2017 Hi All I now will run the motor on a 8s pack and the prop is 18x16 apc this should give me what I need I ill run some test over the weekend and set out some specs Quote Link to comment Share on other sites More sharing options...
MattyB Posted January 20, 2017 Share Posted January 20, 2017 Posted by Gary Vinten 1 on 20/01/2017 14:50:29: Hi All I now will run the motor on a 8s pack and the prop is 18x16 apc this should give me what I need I ill run some test over the weekend and set out some specs That sounds more like it - your pitch speed is in the 100mph ballpark on a 16" pitch, 200Kv and 8S. Just be careful not to go too far the other way and burn out your ESC, as you are operating a lot closer to the limits with that setup; maybe try a 17x16" (if such a thing exists) for starters? Edited By MattyB on 20/01/2017 15:37:37 Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted January 20, 2017 Author Share Posted January 20, 2017 Hi MattyB I have phoned overlander and they say with that setup it should stay in the max amp range of the motor 17x16 prop are around but ill put a watt meter over this setup and see how it goes Quote Link to comment Share on other sites More sharing options...
MattyB Posted January 20, 2017 Share Posted January 20, 2017 It is the ESC I would be more worried about than the motor based on the stats, but if you throttle up slowly whilst monitoring the amps you should be fine. Edited By MattyB on 20/01/2017 16:58:20 Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted January 26, 2017 Author Share Posted January 26, 2017 Specs for the RIZLA + Wingspan 59" Nose to tail 57" AUW including 2x 4s 4500 lipos 7.9ib Wing loading 24oz/sq ft ESC 80amp with built in bec Watts approx. 1700 All metal gear servos Tarannis transmitter all telemetry setup Quote Link to comment Share on other sites More sharing options...
MattyB Posted January 27, 2017 Share Posted January 27, 2017 8S power and you are still going to use the ESC BEC? Brave man. Personally for anything above 4S I install a separate switching BEC or RX pack; I can't imagine the additional weight would be a major issue for this model. Alternatively you could stick with the ESC BEC but add an Optipower Ultraguard for additional peace of mind. Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted January 27, 2017 Author Share Posted January 27, 2017 Hi Matty Well spotted that esc was the original for 6s but now I am on 8s this is the one Max Cont Current: 80A Max Burst Current: 100A for 10 seconds Input Voltage: 4-12 cells li-XX or 12-42 Ni-MH/Ni-Cd battery BEC: None (OPTO) PWM: 8~16 KHz Max RPM: 240,000rpm for 2 Poles Brushless Motor PCB Size: 50x30x17mm Weight: 84g (including wires) Type: Switching Input protection: Reverse polarity protection Output (Constant): 5v/5A or 6v/5A Input: 8v-40v (2-10cell lipo) Quote Link to comment Share on other sites More sharing options...
MattyB Posted January 27, 2017 Share Posted January 27, 2017 I think there is something wrong with that too - the first half of the list says it's an opto ESC, then the last four lines are specs for a switching BEC. I assume that is a completely separate unit? Edited By MattyB on 27/01/2017 16:40:08 Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted January 27, 2017 Author Share Posted January 27, 2017 Matty it is 2 units opto and bec most HV units are opto for safety Edited By Gary Vinten 1 on 27/01/2017 16:46:34 Quote Link to comment Share on other sites More sharing options...
MattyB Posted January 28, 2017 Share Posted January 28, 2017 Yes, well aware of that, hence why I questioned your original post on the last page where you stated you would use the onboard ESC BEC. A word of warning on the cheap HV BECs... the Turnigy one that I was going to put in my Miss Wind failed during initial testing in the plane on a 6S pack despite running happily for 3hrs burn in on the bench on 3S. The learning for me was always test BECs for a good few hours using your intended input voltage before installation; if they are going to die, it's normally within the first few hours of operation. Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted February 2, 2017 Author Share Posted February 2, 2017 ok last pics before its maiden with its little brother Quote Link to comment Share on other sites More sharing options...
MattyB Posted February 6, 2017 Share Posted February 6, 2017 Did it fly successfully, or were you beaten by the weather? Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted March 1, 2017 Author Share Posted March 1, 2017 Hi Matty Yes I have been beaten by the weather but I don't normally fly in the winter months to cold for me But will let you know hen I have done the median Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted March 5, 2017 Author Share Posted March 5, 2017 Hi All although I haven't flown the RIZLA + I am about to embark on a larger one called the RIZLA ULTMATE this will be for electric only 30cc 40cc running on a 10s with about 80amp esc About 79" span and all up weight of about 12/14Ib Watch this space Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted March 5, 2017 Share Posted March 5, 2017 go on there Gary..... I'm watching from ne..1 land...quicker you get the plan out the quicker you'll be a millionaire... ken Anderson.... ne...1 Rizla dept. Quote Link to comment Share on other sites More sharing options...
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