Rich too Posted January 13, 2014 Share Posted January 13, 2014 Has this been mentioned in any reviews etc? Since the plane was designed for a 30cc petrol engine I would not worry too much... Rich Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 13, 2014 Share Posted January 13, 2014 If worried epoxy some good ply onto the face-inside if you can add some triangle fillets and re drill the holes. Quote Link to comment Share on other sites More sharing options...
Matt Jones Posted January 13, 2014 Share Posted January 13, 2014 It's not just the outright thickness of the wood but also the quality of it. It it's 6mm liteply then that's a different conversation to if it's high quality 6mm birch ply. For what it's worth I had an 80cc Su-26 with a 1/4" firewall, no issues Quote Link to comment Share on other sites More sharing options...
john melia 1 Posted January 13, 2014 Author Share Posted January 13, 2014 Dont know if this is light ply or birch , Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 13, 2014 Share Posted January 13, 2014 glue a piece on John, then you'll have piece of mind, that ply don't look bad use big washers on your bolts to spread the load I use wing bandage to strengthen corners with epoxy Quote Link to comment Share on other sites More sharing options...
john melia 1 Posted January 13, 2014 Author Share Posted January 13, 2014 Cheers john Quote Link to comment Share on other sites More sharing options...
Matt Jones Posted January 19, 2014 Share Posted January 19, 2014 Posted by john melia 1 on 09/01/2014 08:03:06: wouldn't mind having a go matt , any tutorials As it happens my current build needs a new U/C so I've taken photos as I've gone, should be finished by mid week when I'll post up a guide. Quote Link to comment Share on other sites More sharing options...
iqon Posted January 20, 2014 Share Posted January 20, 2014 reading with interest as i may buy one myself, the dle is not a heavy engine,adding a further thickness of firewall onto the inside will add strength and give you added weight Quote Link to comment Share on other sites More sharing options...
john melia 1 Posted January 20, 2014 Author Share Posted January 20, 2014 thanks matt looking forward to seeing your photos . Thanks iqon , so are you saying I dont have to put any extra thickness onto the firewall Quote Link to comment Share on other sites More sharing options...
Matt Jones Posted January 20, 2014 Share Posted January 20, 2014 It's difficult to comment without actually seeing the quality of the building, glue joints, wood etc but from past experience I'd say you should be OK. Unless the web is awash with people commenting about in flight failures then I have to assume they're 'fit for purpose'. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 20, 2014 Share Posted January 20, 2014 hello John I think what iqon was saying was the dle is a light engine so adding another bit of ply may help with C.G lads at ours have just reinforced corners (no problems) Quote Link to comment Share on other sites More sharing options...
iqon Posted January 20, 2014 Share Posted January 20, 2014 Posted by john melia 1 on 20/01/2014 15:53:30: thanks matt looking forward to seeing your photos . Thanks iqon , so are you saying I dont have to put any extra thickness onto the firewall i would definitely add more ply, sorry if i misled you .. My point was you will probably have to add lead for your cg so adding thicker firewall is of no detriment. Quote Link to comment Share on other sites More sharing options...
john melia 1 Posted January 21, 2014 Author Share Posted January 21, 2014 ok will be adding more ply Quote Link to comment Share on other sites More sharing options...
Matt Jones Posted January 21, 2014 Share Posted January 21, 2014 John, have a look here for one way to make a composite undercarriage **LINK** Quote Link to comment Share on other sites More sharing options...
john melia 1 Posted January 21, 2014 Author Share Posted January 21, 2014 thanks matt brilliant Quote Link to comment Share on other sites More sharing options...
john melia 1 Posted January 31, 2014 Author Share Posted January 31, 2014 Well, seemed to have hit a bit of a problem ..... engine bolted to firewall ........ Cowl sitting square and flush to airframe ........... look at propshaft ........ and now with spinner backplate ....... any ideas on how to rectify this problem , the only solution i can see is to machine the back of the cowl which i have no means of doing Quote Link to comment Share on other sites More sharing options...
Wingman Posted January 31, 2014 Share Posted January 31, 2014 Strange! Is the engine box on upside down? Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 31, 2014 Share Posted January 31, 2014 If you can't adjust the firewall, then it might need several washers to get the correct angle. Do you have an incidence meter of any kind to check the angles? Quote Link to comment Share on other sites More sharing options...
Martyn K Posted January 31, 2014 Share Posted January 31, 2014 First of all I would check which (or perhaps both) is incorrect. Level the fuselage so the datum is horizontal. Check the thrust-lines (Right and Down) are correct. If they are OK, then you will need to trim the cowl. If not you will have to move the engine in relation to the firewall. I am not sure if you can use washers for spacers, but it doesn't look insurmountable Good luck Martyn Quote Link to comment Share on other sites More sharing options...
john melia 1 Posted January 31, 2014 Author Share Posted January 31, 2014 @ Wingman , I dont think so as the firewall appears to have downthrust . @Cymaz I dont have an incidence meter , but if I used washers would that not effect the downthrust . @ MartynK how do I check the side and downthrust are correct , it doesnt state what these are in the manual . Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 31, 2014 Share Posted January 31, 2014 Ok , as a rough guide get the plane dead level on the fus using a reference line,eg a stringer that goes from front to back. Then without moving anything and using the same level does the engine sit level putting the level on the prop thread? If so then it is most likely the cowl will need trimming. Quote Link to comment Share on other sites More sharing options...
Rich too Posted January 31, 2014 Share Posted January 31, 2014 have you got a shot of the whole fuse, both with/without cowl? Edited By Rich2 on 31/01/2014 14:39:05 Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 31, 2014 Share Posted January 31, 2014 Are you sure the engine support box is the correct way up....sorry to ask Quote Link to comment Share on other sites More sharing options...
Matt Jones Posted January 31, 2014 Share Posted January 31, 2014 I'm not sure this is an easy fix and I'll try to explain why: 1 - If you packed the top two aluminium mounts with washers to achieve the right downthrust you'll have two issues. a) the holes in the bulkhead won't line up properly with the mount or the engine won't be bolted square to the mount and b) the propshaft will have been displaced down so far the cowl won't fit. 2 - Looking at the way the cowl fits I would suggest that it's right. The paint line and the upper profile shows the fuselage transitioning nicely into the cowl. If you trim the cowl to fit the current position of the engine then it will suddenly deviate downwards in relation to the fuselage. It will look awful and once done is hard (but not impossible) to rectify. If it was mine then there would be only one solution, it's a pain but the only way to do it properly. Working on the assumption that the cowl locates correctly (more photos would be helpful) then the engine must be adjusted to suit. I would build a new engine box and locate it higher up the firewall and build the downthrust angle in to the front face of the box. Was the current box already attached when the kit arrived? Have you flagged this to HK yet to see what they're response is? Quote Link to comment Share on other sites More sharing options...
john melia 1 Posted January 31, 2014 Author Share Posted January 31, 2014 cymaz its an artf so I have no input on engine box, unless its been installed wrong at the factory . rich2 I will take some photos now Quote Link to comment Share on other sites More sharing options...
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