Danny Fenton Posted November 26, 2014 Author Share Posted November 26, 2014 Hi Steve, I think you have seen mention of the Mass Build elsewhere? This was a sort of follow on to the mass build for those that have a few plan built models under their belts and want to tackle something a bit (he says tongue in cheek ) more challenging. This is not for beginners thats for sure. However we have a few chaps that haven't a lot of experience and they are doing very well indeed! Careful, methodical and accurate building will get you through in the end. But its not a quick build thats for sure! You may notice there is a whole section on the forum dedicated to the Chipmunk builders "Chip Shop" And a dedicated chat thread to keep the builds seperate. Its been very popular, and a lot of fun. The full story behind the project and the reduced price plan, laser cut parts, canopy, cowl, hinge sets etc etc are all identified in the Chip Shop thread. Its not too late to join in, but it isn't for the feint hearted Cheers Danny Quote Link to comment Share on other sites More sharing options...
Steve T Posted November 26, 2014 Share Posted November 26, 2014 Thanks Danny, looks like I've got a fair amount of reading to do as well as building but if this is a good grey matter work out then it's right up my street. Look for me joining in with my build around the start of December. Bring it on ! Quote Link to comment Share on other sites More sharing options...
Charles Galloway Posted November 26, 2014 Share Posted November 26, 2014 Yours is really beginning to look the business Danny. I'm really struggling to find the correct position of the rear wing fairings. I just don't feel happy with parts not fitting and then having to dangle parts in thin air until they look right. I can't see how the ply part G5 fits at all. Charles. Quote Link to comment Share on other sites More sharing options...
Steve T Posted November 26, 2014 Share Posted November 26, 2014 Again thanks Danny, found the plan, parts etc. ordered! Her who should stay indoors away from my man cave will be less than impressed when it turns up but maybe I'll tell her I'm building Icarus and Deadalus wings for her, guess which are hers? Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted November 26, 2014 Author Share Posted November 26, 2014 Hi Steve, I hope you read far enough to realise theres a 10% discount? Slec are also still doing the hinge sets, just ask for CNC Chris Will be great to have another aboard the build! Charles that part is for a boat, or a tank or a house! I couldn't make it work at all on this Chippy. I did fit very well in the bin though Yes the fairings are a glue a bit see how it looks, saw it off, glue another bit on, saw that off. Good game..... Cheers Danny Quote Link to comment Share on other sites More sharing options...
Steve T Posted November 26, 2014 Share Posted November 26, 2014 Nice to be welcomed in, I live seriously out in the middle of 'lost land' so really do not meet any modellers other than on this site. Yes got the discount, every bit counts and adds up. I am catching up on the forum reading and quite surprised at what looks like a simple low wing trainer is such an interesting prospect to build, I may put others on the back burner to attack this with a false sense of ability. Quote Link to comment Share on other sites More sharing options...
Bernie Posted November 26, 2014 Share Posted November 26, 2014 The DH Chipmunk is quite a loved air craft by modelers ,I flew in them as a young man and grew to love it .the BBMF have one for the pilots to gain taildragger experience . Quote Link to comment Share on other sites More sharing options...
Dennis Mulhair Posted November 27, 2014 Share Posted November 27, 2014 Hi Danny, Received the rivet making kit this morning. Look forward to practicing over the weekend. Dennis Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 1, 2014 Author Share Posted December 1, 2014 You will have to let us know how you get on Dennis, I find I have to wipe the tip of the needle every dozen or so rivets. Managed to get the control line leadout guide made and fitted. This needs to be adjustable via a removable wing tip. It can also be removed when the model is being flown in RC mode. A similar set up will be done for the other wing where a weight will be attached. Cheers Danny Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 2, 2014 Author Share Posted December 2, 2014 Taking on board what other builders have said I added a bit of bracing to the spars. Not that the wing was unduly flexible but for very little weight this has stiffened the wing even more. I only braced up to the aileron bellcrank bay. Starting to look at covering the wing, now where is the Natural Solartex Cheers Danny Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 2, 2014 Author Share Posted December 2, 2014 I couldn't resist adding a false additional rib with the correct angle The sheeting has also been rebated to "fake" the angle. Made another small sanding tool, you know I like these This block is designed to be used against a guide, and will sand a channel, but the channel is a fixed depth and angled. This will be for the Solartex to "tuck" away in. Not sure it will work so don't copy lol The guide is just a scrap of 1/8, once the channel is started though it is self alligning. The sam channel is cut along the leading edge to trailing edge juncture. Cheers Danny Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted December 2, 2014 Share Posted December 2, 2014 Blimey Danny that extra rib is expensive- more than£1.20! Hope you got that passed by the Domestic Purchasing Manager! Looking good and I'm waiting to see how you manage this bit! I'm doing the fuz shells as I needed a break from the wings/ailerond/flaps. Planking is good therapy tho'! Terry Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 2, 2014 Author Share Posted December 2, 2014 Its an internal costing, just between modelling departments, doesn't count in the real world Just shows how much materials procurement charges the manufacturing department. Domestic purchasing manager must not be involved..... Cheers Danny Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted December 2, 2014 Share Posted December 2, 2014 Understood! Not a word shall pass in the presence of Sid! Terry Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 2, 2014 Author Share Posted December 2, 2014 Quote Link to comment Share on other sites More sharing options...
Dennis Mulhair Posted December 2, 2014 Share Posted December 2, 2014 Danny, looking back at your bracing of the wing spars, would it not of been easier to use sheeting between the ribs instead of cutting individual braces? Dennis Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted December 2, 2014 Share Posted December 2, 2014 Good question Dennis, crossed my mind too I would have thought a 1/16th shear web would have been stronger Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 2, 2014 Author Share Posted December 2, 2014 Hi Dennis, adding the shear webs after the capping strips does indeed make them more awkward. However these were very simple as I cut them all first, and then just trimmed them shorter as I moved to the tip. The good thing about using diagonals like this is the grain is in the right direction, ie 45 degrees to the spars. If you use normal webs then the grain runs up and down. I have seen it stated (perhaps by our own professor BEB) that the webs do not need to touch the ribs at either end to still carry out their function. I have seen a few ARTF's use this diagonal strip webbing as I have and it has certainly added stiffness for very little weight. Cheers Danny Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted December 2, 2014 Share Posted December 2, 2014 That answer confuses me! I though the point of shear webs was to cross brace the spars and transfer load from the spar under tension to the one under torsion, hence the need for vertical grain.... Diagonals would seem to work only when the wing is flexing into the direction of the diagonal as that will compress the brace, but in a flex the other way they will be under pulling strain and extended offering less support and rigidity Can we wheel out the tame aerodynamicisist for a answer!?!?!?!?!?! Edited By Dave Hopkin on 02/12/2014 18:03:02 Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 2, 2014 Author Share Posted December 2, 2014 I wish we could, but I get a feeling the rest of the forum is not watching our builds. I certainly haven't seen many of the non Chippites join in. Not sure if this image is clear enough, look at the spar web grain. Cheers Danny Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted December 2, 2014 Share Posted December 2, 2014 Looks like its ply and diagonal..... Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 2, 2014 Author Share Posted December 2, 2014 Found this as well, it shows grain direction. I am referencing full size aircraft construction here, I realise for models we tend to go with the grain vertically. Cheers Danny Quote Link to comment Share on other sites More sharing options...
Tony Bennett Posted December 2, 2014 Share Posted December 2, 2014 i have built wings with no shear webbing at all and not had problems, the barnstormer was built without sheer webbing and seemed to survive, though it was not aerobatic. nice work Mr Fenton. don't say much as the quality of the build has just stunned me to silence. Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 2, 2014 Author Share Posted December 2, 2014 Thanks Tony I dropped our ace aerodynamacist and structural expert a pm and he has agreed to shine the bright light of knowledge in our eyes. Dont't blink Cheers Danny Quote Link to comment Share on other sites More sharing options...
Tony Bennett Posted December 2, 2014 Share Posted December 2, 2014 does he have a beard as all the best people have one. as per your advice i have purchased some rc modellers glue for me next bash at rivets. Quote Link to comment Share on other sites More sharing options...
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