Mike Stevens Posted October 15, 2014 Share Posted October 15, 2014 My pilot arrived today but she is a little large so might have to change scale! Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted October 15, 2014 Author Share Posted October 15, 2014 Posted by Max Z on 15/10/2014 12:39:56: My Atom is coming along slowly but surely: Max, Nice ATOM I do like the way you have shaped your mast, subtle but very effective. Rich Quote Link to comment Share on other sites More sharing options...
Chris Dowell Posted October 16, 2014 Share Posted October 16, 2014 I have to advise of the durability of this model.....a couple of days ago I was playing with a two blade assembly and got the model on its side in a long pylon type turn...full opposite rudder and roll...but still no control until it hit the ground ..fast on its side.. Now you have to expect a lot of damage in that situation....but only broke the prop and the two booms as they exit the fuz. Simple fix. Chris... Quote Link to comment Share on other sites More sharing options...
Terry Whiting 1 Posted October 16, 2014 Share Posted October 16, 2014 Hi Chris, I bet you thought that was 'Good night Atom', glad it's to be a simple fix. There is truth in the old saying "the lighter they are the lighter the fall, the heavier they are..........you know the rest.... Max, I was only going to crib your mast idea,, I'm was fortunate in buying my C30 early, although I have made a head using an IC car universal drive coupling, must add not as nice looking as your concept . Terry Quote Link to comment Share on other sites More sharing options...
Terry Whiting 1 Posted October 16, 2014 Share Posted October 16, 2014 If there is anyone interested this rotor head was made from an IC cars universal drive coupling, and an old penny, plus some 1.5 FG sheet, and a motor mount as a bearing holder. As with Max's head this one is also untried Quote Link to comment Share on other sites More sharing options...
Max Z Posted October 16, 2014 Share Posted October 16, 2014 I did the "hanging test" today, with everything on board except for the rotor (I figured since it will be symmetrical around the tethering point it will not influence the hanging-angle). I am finding that the angle is right up to the maximum of 18 deg. I did use a slightly heavier motor than the one proposed in the instructions (a Turnigy SK3 2830 series rather than a 2826), about 13-14 gram difference. For this reason I moved the bulkhead some 10-12 mm back, and put the motor hard against it. Prop is an APC E type, 10x5. Battery is a 1650 mAh 3s, I moved it right back in the cockpit area. The only conclusion I can draw is that I built the tail too light . What should I do best, go with it or add some weight to the tail to move the CofG backwards? Max. Edited By Max Z on 16/10/2014 17:57:38 Edited By Max Z on 16/10/2014 17:58:05 Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted October 16, 2014 Author Share Posted October 16, 2014 Max, You should be fine at that. We had a new one turn up at our OW get together last weekend and that had about 20 degrees hang, it flew with very little trim change. Graham, the builder and flier may be able to give a little more info if he sees this post. I will find the actual balance point on mine later on and take some snaps, at least we can compare like for like then. Rich Quote Link to comment Share on other sites More sharing options...
nigel simkin Posted October 16, 2014 Share Posted October 16, 2014 I tried my Atom again last w/e with my original Atom blades with the larger shim as used on my auto g2 blades on which it flew fine, this time however no problem getting the blades to spin up but as soon as it got airborne she just wanted to climb very steeply virtually stalling it, gave up in the end. Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted October 16, 2014 Author Share Posted October 16, 2014 Nigel, You need to add a little extra shim to your blades, this will cure the nosing up under power by reducing the lift available from your blades. If you get to the stage where you need to pull back to get it to ROG you have added too much. It is surprising how just the thinnest of shim strips can alter a model. Max, I have just measured my CG for reference, blade assembly was removed and the Lipo was installed. From F3 it roughly balances at around 50mm forward of this, hope this helps? Sorry about the photo, there is no natural light. Rich Quote Link to comment Share on other sites More sharing options...
Joe Anderson Posted October 16, 2014 Share Posted October 16, 2014 My Atom is still flying strong ever after a few visits to the bushes The guests at the Hotel love it and are getting interested in Autogyros I'm using the std H K head and blades with the hinge changed to this The mast is an 8mm alloy tube from a Raptor 50 tail support held in place with a screw Also the tail plane is removable for repair I also fitted a steerable tail wheel to help with ground handling Rich did you get the kit I sent you via Neil? Joe Edited By Joe Anderson on 16/10/2014 21:09:25 Edited By Joe Anderson on 16/10/2014 21:10:21 Edited By Joe Anderson on 16/10/2014 21:28:52 Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted October 16, 2014 Author Share Posted October 16, 2014 Joe, Yes I got the kit, excellent quality. I have sent him the files for my O/D head, it should be cut by the weekend hopefully. Simple (and cheap I hope) replacement for the hard to get HK head. Here you go, Atom Special at the RC Hotel in Greece.... Rich Edited By Richard Harris on 16/10/2014 21:10:42 Quote Link to comment Share on other sites More sharing options...
nigel simkin Posted October 16, 2014 Share Posted October 16, 2014 Rich do I need to add the extra shim to the rear of the blade still & by what sort of thickness? Quote Link to comment Share on other sites More sharing options...
Joe Anderson Posted October 16, 2014 Share Posted October 16, 2014 Great I fly back to Scotland next Tuesday and will see what Neil has produced Thanks for the proper link to the video how did you do it? Joe Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted October 16, 2014 Author Share Posted October 16, 2014 Nigel, How much shim at the rear of your blade have you got at the moment? Joe, How to add a video is HERE Rich Quote Link to comment Share on other sites More sharing options...
Max Z Posted October 16, 2014 Share Posted October 16, 2014 Posted by Richard Harris on 16/10/2014 20:58:52: From F3 it roughly balances at around 50mm forward of this Thanks Rich. Mine balances a bit further forward, about 55 mm from F3. Max. Quote Link to comment Share on other sites More sharing options...
nigel simkin Posted October 16, 2014 Share Posted October 16, 2014 Rich it's approx 0.8mm Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted October 16, 2014 Author Share Posted October 16, 2014 Nigel, Can you take a photo of your blade mounted to the head? looking from above. I want to see what gap is between the end of the blade and the blue flat on the triangular bearing holder. 0.8mm should be more than enough shim. Rich Quote Link to comment Share on other sites More sharing options...
nigel simkin Posted October 16, 2014 Share Posted October 16, 2014 The blades aren't on it at the minute, but I can tell you the gap between the end of the blades & the blue triangular bit is 5mm Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted October 16, 2014 Author Share Posted October 16, 2014 Nigel, Trim the end of the blade so that you have roughly a 14mm gap between blade root and blue triangular bearing housing.Rich Quote Link to comment Share on other sites More sharing options...
Max Z Posted October 17, 2014 Share Posted October 17, 2014 Posted by Richard Harris on 16/10/2014 22:38:14: Trim the end of the blade so that you have roughly a 14mm gap between blade root and blue triangular bearing housing. Posted by Steve Jones 2 on 13/10/2014 21:13:34: So, my Atom blade dimensios are: Length - 445mm Width - 52mm Bolt mounting - M3 at 20mm from blade root I am getting confused here, both pieces of info are conflicting. I had to guess at the size of the bearing housing since I do not have the HK head to measure, but with the position of the holes as per the published drawing it can hardly be any smaller than what I drew in this sketch: This results in a blade bolt position of 10.5 mm from the root, not the 20 mm that Steve mentions. Where did I go wrong? Max. Edited By Max Z on 17/10/2014 14:41:15 Quote Link to comment Share on other sites More sharing options...
Steve Jones 2 Posted October 17, 2014 Share Posted October 17, 2014 Hang on then, will take a pic of mine with ruler and you can scale to suit.. Steve Quote Link to comment Share on other sites More sharing options...
nigel simkin Posted October 17, 2014 Share Posted October 17, 2014 just out of interest what should the actual length of the blades be or doesnt it really matter? I've seen few different sizes so far. Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted October 17, 2014 Author Share Posted October 17, 2014 Max, That drawing is bang on! And here is the first head that has been cut, I will be getting a few of these to assemble early next week which I will test hard! I have made it as simple as I can , keeping the material the same thickness all round with minimal parts. I will post more as I start assembling if anyone is interested? Rich Quote Link to comment Share on other sites More sharing options...
nigel simkin Posted October 17, 2014 Share Posted October 17, 2014 I'd be interested in one Richard Quote Link to comment Share on other sites More sharing options...
Steve Jones 2 Posted October 17, 2014 Share Posted October 17, 2014 Here is mine... Similar but different DImensional difference is probably the taper at the root.... Note also the reduced with HK head 'T bar' - 8mm cut off both sides to increase roll travel . Links to the servos are parallel. Steve Edited By Steve Jones 2 on 17/10/2014 17:39:01 Edited By Steve Jones 2 on 17/10/2014 17:41:02 Quote Link to comment Share on other sites More sharing options...
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