Chris Bott - Moderator Posted December 16, 2009 Share Posted December 16, 2009 Steve, of course a 6V battery could turn that motor. Danny says it does, so I recon it does! Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted December 16, 2009 Share Posted December 16, 2009 Danny is this how it's all connected? If so, it's the Mui or an unwanted connection within the ESCDon't connect cells yet! Chris Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 16, 2009 Author Share Posted December 16, 2009 Hi guys back from tea (theres a very British thing lol) anyway thanks for the suggestions. and yes that was how it was wired Chris. I have completely isolated the mui from the circuit now so just have a Rx pack going into the Rx and the channel 1 (JR throttle) feeding esc. The ESC is feeding the motor. It still arms and spins as you nudge the throttle up past idle........ I will try removing the red wire first just to prove it isn't that. And then I am going to pull all servo leads apart from throttle. mmmmm interesting Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 16, 2009 Author Share Posted December 16, 2009 Okay removing red wire from ESC lead to Rx has cured/masked the problem. But I am going to try a servo tester first before I risk a brand new Rx and MUI in the circuit......... tally ho Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted December 16, 2009 Share Posted December 16, 2009 At the mo, it seems like a short (or some sort of connection) from ESC's servo lead "red" to the ESC's power pack input "red" If this is the case, full power pack volts could appear on that servo lead "red" we don't want that anywhere near a rx. Good luck testing with the servo lead "red" removed Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 16, 2009 Author Share Posted December 16, 2009 okay more intriguing and it is looking like Bruce might be getting the cream bun It works fine with the red lead in the servo cable to the esc or without when the servo teser is used. Following Timbos suggestion I connected a MM across the ESC batt connectors (no power cells connected) and with the red esc servo lead in place there is 9.7v present. With the red lead removed nothing. The source Rx pack is reading 6.33. If I connect a power cell to the esc and measure between the red and black coming out I have 5.3v so it must contain a BEC Still going to use a seperate UBEC lolol Anyway lesson learned........ thanks everybody for your help Cheers Danny Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted December 16, 2009 Share Posted December 16, 2009 Cool well done Danny. There must be a BEC in there. And supplying the output of the BEC with Rx batt sent a supply backwards through the BEC to the power leads, and this turned the motor.. blimey, you live and learn! Quote Link to comment Share on other sites More sharing options...
Tom Foreman Posted December 16, 2009 Share Posted December 16, 2009 Good luck with the maiden Danny, glad you sorted your ESC gremlins, this wouldn't be a Turnigy ESC were taking about is it? Cheers Tom Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 16, 2009 Author Share Posted December 16, 2009 Hey Tom thanks It is rather annoying I have just checked back through my purchases and found the esc and yes it is a Turnigy Plush 80A and it says all over it that it has a BEC I was being a right plonker But this isn't the symptoms I would have expected for that, that's my excuse and I am sticking to it. Hopefully I will be able to drag Chris along to film the event, (Friday) though our efforts in the past have usually been rather poor on the videoing fron Cheers Danny Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted December 17, 2009 Share Posted December 17, 2009 I have found the ESCs without BECs tend not to have a red wire. Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted December 17, 2009 Share Posted December 17, 2009 Hi Bruce, I must have nearly a dozen non BEC ESC's, all of them have a 3 wire servo lead. All's well that ends well though, fingers crossed for some suitable weather.. Chris Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted December 17, 2009 Share Posted December 17, 2009 OK I stand corrected Chris. Thanks. Quote Link to comment Share on other sites More sharing options...
Ross Clarkson Posted December 17, 2009 Share Posted December 17, 2009 Yes, i suppose i forgive you Danny. You definitely have done the right thing by shortening the whole fairing as the real phot shows it shorter (I realise there is no weight on it) but the way you have done it will make it look better than being notched. Can't wait to see this fly. Good luck. Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 17, 2009 Author Share Posted December 17, 2009 Hi chaps, Bruce if you can make the Greenacres leccy fun fly on July 24th and 25th next year I owe you an ice cream Ross, yes I think it has been a better choice to shorten the fairing. The fairing BTW has already cracked and is only made of abs I do not see it lasting very long. A much nicer fairing could easily be made from lith plate if it comes to that. Anyway the C of G has come out very close with no ballast at all. It is spot on the wing support tube. The destructions say half an inch in front of that, but when you consider the wing has a chord of 18" its not very far out at all. Well I have just got to charge the packs and brace myself for the minus 1 forecast for tomorrow. Not ideal temperatures when you have a lot of fiddly rigging to do at the field Hopefully my next post will have good news and a video.............. Quote Link to comment Share on other sites More sharing options...
Ross Clarkson Posted December 17, 2009 Share Posted December 17, 2009 You might need to fit skids for tomorrow Danny!!!!!! Quote Link to comment Share on other sites More sharing options...
nasa_steve Posted December 17, 2009 Share Posted December 17, 2009 with a BEC in the system that would explain the motor running if it was opto there should be no chance of the motor turning with just the receiver in the sytem. i missed the comment that it "drove" the motor (CHRIS i am so sorry my humblest apologies for missing a word) i thought danny had JUST said it had armed. with regards to the power available you cannot directly use full size - model power relation as the air molecules do not get smaller for a model flight i wish you luck with the maiden one thing is for sure it won't be overpowered on 2hp it will if anything be scale ish. as i've said i personally would have gone for a bigger motor for sure......i would have gone down the route of powering it the same as the 45cc output would be or at least 30cc equivilantsteve Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted December 17, 2009 Share Posted December 17, 2009 It's a long way for me but I will try my best to be ther. The offer of an ice cream is very hard to resist. Edited By Bruce Richards - Moderator on 17/12/2009 18:04:00Edited By Bruce Richards - Moderator on 17/12/2009 19:45:35 Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 17, 2009 Author Share Posted December 17, 2009 LOL what is it with the moderators on this site, you'll do anything for sticky buns, ice cream......... Hi Steve, I was using somebody's experience that has already competed with one of these Chipmunks and at national level. He uses an SC120 and not a new one either. Given that a new OS 4 stroke barely produces 2hp then Andy's is probably down on that. So I will not need much to fly the simple aeros that the Chipmunk could manage. I have a 10lb Seagull Sea Fury that most people are fitting a 4 stroke 120 in.......2hp. I am flying mine on 800 watts and it doesn't hang around, thats only 1hp. The difference between an 85% efficient powerplant and one that can barely achieve 45% http://www.youtube.com/watch?gl=GB&hl=en-GB&v=iZ3rtD9mqQo Cheers Danny Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 18, 2009 Author Share Posted December 18, 2009 Well I must first of all give a big thanks to Chris for coming out to assist me today. To say the weather was cold would be an understatement. When I left the house it was showing +1 degree and there was a good 10 -12 mph breeze. That breeze was obviously coming direct from Siberia. By the time I arrived at the flying site the temperature had dropped further and by the time you took into account the chill factor it must have been about -273.15 degrees, absolutely all of me was frozen!!! Anyway taxi trials were useless the rock hard ground was pumelling the model, so after a minute or so of trying to taxi about gave up and lined her up into wind........ First some pictures: Thanks Chris for getting some great shots Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted December 18, 2009 Share Posted December 18, 2009 Hi Danny, I'm just beginning to thaw. It was really raw out there. I've flown off snow and been much warmer. Went well though, from what I could see through a viewfinder! One day I'll see one of your maidens for real I'm glad you cut it short anyway, fingers were starting to stick to the camera. Here is the video, proves how well it went. On a warmer day when you can actually control yr thumbs it will be a real winner, with very long flight times too by the look of things. Well done. Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted December 18, 2009 Share Posted December 18, 2009 MM a bit small that - suggest full screen or the youtube link http://www.youtube.com/watch?v=0uAZBobZqB8 Cheers Chris Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 18, 2009 Author Share Posted December 18, 2009 Thanks Chris, yes the flight was a bit short in this instance and also erratic, all down to me not being used to the model, it was weather cocking quite a bit more than I was expecting, more akin to a Tiger Moth or indeed your Cirrus Moth. But it felt nice despite the bitter cold. I literally could not feel the sticks under my thumbs and discretion was to land. It took off at about 3/4 throttle because i wanted to get it of f the hard ground, If memory serves, the figures showed it peaked at 60A @ 19 volts so about 1140 watts. It had more than enough power for me, and that 2 minute flight used around 500mAh from a 10,000 pack so lovely long flight times with loads of touch and goes I was very pleased with the landing, the ground affect kicking in just when you need it, and despite it being a peach, the farings broke loose. Probably the jarring from the icy ground. The model is a bit fiddly to rig at the field but worth the hassle so that the wing is so easy to transport. Anyway that just about wraps up this thread, its been fun and what a nice model. If you were to use it as a basis for a makeover it could look really nice. Once again abig thank you to Chris for the video and stills. Now where did I get to on the Hurricane........... Danny Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted December 18, 2009 Share Posted December 18, 2009 Well done both of you...that last photo really shows the models size! I guess its pretty nigh on impossible to guage the flight due to the obvious pilot discomfort! I think I heard you mutter it may be tail heavy? It could be of course that you were simply overcontrolling her a tad...maybe lower rates or more expo might help? As I say....very difficult to tell - you know best ...after all you were the pilot !Good work lads, and again congrats Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 18, 2009 Author Share Posted December 18, 2009 Hi Timbo thanks for that, (nice Camel article, got mine yesterday) yes it was a bit erratic honestly I do usually fly better than that. I was frantically trying to dial in a fistfull of up elevator trim at the same time, which necesitates removing the thumb from the stick at times. The wind made it a little hard to tell on the ailerons but they seemed okay. Yes the throws need reducing, it was way to sensitive, and the 30% expo was struggling to compensate for the throws. It also seemed to pitch nose down under power, but that was very difficult to tell under the conditions. I wanted to try the flaps but was afriad I wouldn't feel my way to the sticks again, literally all feeling had gone from my finger/thumb tips. Anyway thanks Quote Link to comment Share on other sites More sharing options...
Bob Webster Posted December 18, 2009 Share Posted December 18, 2009 Hi Just found this post. Interesting to see the Black Hawk Chippie. I'm not long started on the RM 276 Chipmunk. Test flight looked fine - nice weather for a test flight though. Have your thumbs recovered? I have a friend who also has the Black Hawk and is fitting the requisite petrol engine. I'll stick to glow, perhaps a Laser 150. Well done Bob W Quote Link to comment Share on other sites More sharing options...
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