Peter Miller Posted January 6, 2016 Share Posted January 6, 2016 Some how I doubt if it would save very much. You would need hard strip insread of medium sheet, then a lot more glue. But then that is just a guess Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted January 6, 2016 Share Posted January 6, 2016 Well its personal preferences isn't it. On the plus side you get the satisfaction of building it - nice bit of craftsmanship. We get a nice illustration for the MB of how a design can be customised. You get the pleasure of knowing your Ballerina is just that little bit "individual" to you! On the other side, if it did lighten the back half of the fuselage signiifcantly (and I agree with Peter the jury is out on that one) then it might not be particularly helpful with regard to the CoG position. KC's mock up and my "fag packet" calcs all indicate that the design is very well balanced "as is". And being IC you don't have the flexibility of a whopping big heavy battery to manoeurve back and forth to get the CoG in the right place! It might be rather galling to go to all the trouble of a built up rear end only to find that you have to add lead to the tail to get it to balance correctly! BEB Quote Link to comment Share on other sites More sharing options...
AVC Posted January 6, 2016 Author Share Posted January 6, 2016 Thanks all for your comments. I considered it mainly for the pleasure of building, but as you say, in the "best case" I won't save any significant weight, and in the worst case, I could have problems balancing it. Maybe when I decide to escalate the Ballerina and do a 200% version, I'll go for this option ! Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 6, 2016 Share Posted January 6, 2016 One option to consider is to mount rudder/elevator servos at the rear, that would help with the c.g, John Quote Link to comment Share on other sites More sharing options...
Masher Posted January 6, 2016 Share Posted January 6, 2016 Posted by john stones 1 on 06/01/2016 14:55:52: One option to consider is to mount rudder/elevator servos at the rear, that would help with the c.g, John Great lateral thinking there John! Always a few ways to skin the chat. Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted January 6, 2016 Share Posted January 6, 2016 Yes, interesting idea. BEB Quote Link to comment Share on other sites More sharing options...
AVC Posted January 7, 2016 Author Share Posted January 7, 2016 Posted by john stones 1 on 06/01/2016 14:55:52: One option to consider is to mount rudder/elevator servos at the rear, that would help with the c.g, John Thanks John, I though on this option but in this case I would use mini servos because the standard ones would add around 100 grams to the tail, which means around 230 in the nose (very high level calculation...). This will be partially offset by the (potential) weight saved with the fuse, but there will still be some weight to add to the nose, and the only element I have to play with is the Rx battery. Anyway, thanks for the suggestion. Next step will be the wing, and I'll have time to think on the fuse in the meantime Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 So, here we go again... This weekend I've been working on the wing. There's nothing really especial, basically I've followed the pocess described by Peter Miller. This is the first time I make a wing this way, and I must admit that I like it. I probably apply it for future models. These are all elements of the left panel, before assemblyÂÂ  Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 I began with the  ribs that supports the landing gear rail. At this stage, I glued the front half of R1, and R1A together, and added to the building. I tried to give this assembly the right angle for the dihedral Edited By AVC on 10/01/2016 09:08:30 Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 Once the ribs are in place, I glued the dihedral brace in place and added the webbing Edited By AVC on 10/01/2016 09:10:53 Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 And lifted the LE sheeting Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 Next morning (Saturday), the LE support was added. Good system to place it in between the LE sheet... Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 Next was LE sheet. I used again the system descfribed my PM. What I did was to glue the sheeting to the LE and place some pins. Then I poured some water on the sheeting and extend it with the finger, et voila, the sheeting itself curves nicely to the ribs' shape. Then it's just about adding some glue and some pegs. The TE cap strip is also added at this stage Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 And this is the complete panel. Nice and easy! Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 For the second panel, I've used the traditional method of "oil bath". I know it's a bit messy and "oily", but it has some advantages: is cheap, and also once the building is finished, you can deep fry the plan, and serve it with peas. It makes a great starter, and children love it... For those who don't know it, this method consists basically on placing the plan upside down in the table, and apply cooking oil (the cheapest one) on the plan, and extend it. The oil makes the paper translucent and you have a "negative" image of the wing. I then cover it with cling film, and it's ready for building Edited By AVC on 10/01/2016 09:30:00 Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 This afternoon, as long as swmbo authorizes, I'll try and make the second panel... Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted January 10, 2016 Share Posted January 10, 2016 Use paraffin and it will dry out again to look like a normal paper. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 10, 2016 Share Posted January 10, 2016 Very neat, tidy work area as well John Quote Link to comment Share on other sites More sharing options...
AndyD Posted January 10, 2016 Share Posted January 10, 2016 never heard of the oil trick before,i hate to think what sort of mess i would end up in. Quote Link to comment Share on other sites More sharing options...
McG 6969 Posted January 10, 2016 Share Posted January 10, 2016 Hi AVC, The least I can say is that this is a bit overwhelming for me. You make it sound so easy in your description. Great neat process. Lucky enough, I have so much other things to discover before I intend to start the wing building... Cheers Chris BRU - BE / CTR Overwhelming Control Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 Posted by john stones 1 on 10/01/2016 10:00:18: Very neat, tidy work area as well John Thanks John. I won't take all the credit though. I have a great Quality Assurance Manager, Jaime Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 Andy, it's not tooooo messy, although next time I'll try the paraffin that Paul's mentioned, thanks Paul. (I'll miss the "plan & pie dinner...) Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 Thanks Chris, I'm really looking forward to watching your depron ballerina, and learn something about this misterous material ​ Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 Left panel ready to receive the ribs (I've got the impression that I'm missing something...) Quote Link to comment Share on other sites More sharing options...
AVC Posted January 10, 2016 Author Share Posted January 10, 2016 One of my habits is to place the pins vertically, for me it!s easier to ensure an accurate location of the spars. The problem is that they don't allow gluing the upper spar. So what I do is, before gluing the upper spar, I place diagonal pins and remove the vertical ones ÂÂÂ Quote Link to comment Share on other sites More sharing options...
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