Steve W-O Posted March 21, 2011 Share Posted March 21, 2011 I would suggest that one way to build it straight would be to assemble the two sides as above, then to fit two formers and the tank tray to one side, making sure they are square, then with that flat on the board, glue the other side onto the formers and tank tray, using squares to make sure the two sides are exactly aligned. Fit the other formers and cross pieces as far back as the trailing edge of the wing. Then draw a line on the board, jig the front of the fuselage (weights, clamps ot whatever is avaialble) so that the line runs exactly down the centre of the fuselage, then glue the tail end of the fuselage together, making sure it is centred above the line you have drawn. Double check nothing has moved before gluing Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted March 21, 2011 Share Posted March 21, 2011 Posted by Biggles' Elder Brother - Moderator on 21/03/2011 09:21:44: No Problem Steve - could have been better in the "WebBit Wisdom" thread which is were we are trying to collect all this sort of stuff together BEB Copied and pasted both my posts there, please edit if it needs it to make sense Quote Link to comment Share on other sites More sharing options...
Vecchio Austriaco Posted March 21, 2011 Share Posted March 21, 2011 Finished my Webbit on Saturday, wanted to maiden it on Sunday, but it was rather windy at the field so I just made a range test (Jamara DSM2 receiver - you never know..). But I was lucky as our examiner was present - so I did my A with the Seagull Edge 540EP. Means I am ready now for the fy in... Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted March 21, 2011 Author Share Posted March 21, 2011 Thanks Steve. Well done VA! Bit of cake really isn't it? How is progress towards an A coming along for others who haven't got it yet but want to fly at Greenacres? BEB Quote Link to comment Share on other sites More sharing options...
David Davis Posted March 21, 2011 Share Posted March 21, 2011 Well done Vecchio! Quote Link to comment Share on other sites More sharing options...
Vecchio Austriaco Posted March 21, 2011 Share Posted March 21, 2011 Thanks guys - For those who didn't make the A yet - have a go. it's not difficult. It's much more difficult finding your examiner Quote Link to comment Share on other sites More sharing options...
Alan Dorrell Posted March 21, 2011 Share Posted March 21, 2011 Hi Guys, My Webbit is almost ready for covering. But what I want to do is balance the few criticisms some of you have made about the kit. Mine has been virtually perfect, although I found the tabs on the ribs soon broke, so I removed them and used packing instead. Dead easy with a 36 " flat wing. Tara for now. Alan. Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted March 21, 2011 Share Posted March 21, 2011 Posted by Alan Dorrell on 21/03/2011 11:30:22: Hi Guys, My Webbit is almost ready for covering. But what I want to do is balance the few criticisms some of you have made about the kit. Mine has been virtually perfect, although I found the tabs on the ribs soon broke, so I removed them and used packing instead. Dead easy with a 36 " flat wing. Tara for now. Alan. It wasnt a case of being critical, just a case of stating what was so that the newer builders could be aware and check if they found the same thing. Bit unfair to say it is a critisism that needs balancing!!! Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted March 21, 2011 Share Posted March 21, 2011 Posted by Vecchio Austriaco on 21/03/2011 11:25:47:Thanks guys - For those who didn't make the A yet - have a go. it's not difficult. It's much more difficult finding your examiner Great news Gerhard - well done my friend Quote Link to comment Share on other sites More sharing options...
Plummet Posted March 21, 2011 Share Posted March 21, 2011 How little power does the Webbit need? Today I thought to measure the power drawn by my leccie Webbit. I connected up my in-line wattmeter thingy, and at full throttle, it was only drawing about 75 watts. The motor is nominally 200W, so I know that I can fit a bigger prop to it. (I had fitted a (9"x4,7" that I had lying around.) But, I wondered if 75 watts was enough to fly it. The answer is yes. This afternoon I managed to take off with this motor and prop. This was followed by an immediate power-off, stall, and return to earth, as the playing field where I was playing is no good for flying - dammit - it is just behind our house. It is a roughish short muddy grass, but quite lumpy. I hope to have a proper maiden flight in the next day or two. I know that the power drawn by an static aircraft at full throttle is not the same as when it is moving through the air. We say that the prop unloads in the air. How does this effect the power drawn? Can any of you, perhaps someone who can monitor or record in-flight performance, give me an idea of how much power my motor/prop would be drawing in the air or at take off. Plummet Quote Link to comment Share on other sites More sharing options...
David Davis Posted March 22, 2011 Share Posted March 22, 2011 How much does your Webbit weigh Plummet? I'm certainly no expert with electric flight but I believe that the conventional wisdom suggests that if you have 50 watts per lb, a model will just about stagger into the air. At 75 watts per lb the model will fly well enough. At 100 watts per lb the model will have a sprightly performance and beyond 100 watts you get even better performance. "Power-off stall and immediate return to earth?" Why did the motor cut? Is your C of G correct? My own i/c powered, much customised Webbit weighs in at 3 lbs so I'd be surprised if 75 watts would fly it. I have finished building and covering my model and only need to instal the radio. I hope to maiden it later in the week. Happy Landings Dave Davis Webbiteer 15 (I'm the 15th builder on the list that BEB posted a week or two back.)Edited By David Davis Telemaster Sales UK on 22/03/2011 05:49:35 Quote Link to comment Share on other sites More sharing options...
Plummet Posted March 22, 2011 Share Posted March 22, 2011 Posted by David Davis Telemaster Sales UK on 22/03/2011 05:48:12:How much does your Webbit weigh Plummet? <snip/> "Power-off stall and immediate return to earth?" Why did the motor cut? Is your C of G correct? My own i/c powered, much customised Webbit weighs in at 3 lbs so I'd be surprised if 75 watts would fly it. I have finished building and covering my model and only need to instal the radio. I hope to maiden it later in the week.<snip/> Dave Davis Webbiteer 15 (I'm the 15th builder on the list that BEB posted a week or two back.)Edited By David Davis Telemaster Sales UK on 22/03/2011 05:49:35 Hello, It weighs about 1kg all up. My Power-off, stall... was deliberate. If I had allowed it to gain too much height and speed I would have had problems doing a landing. The field is too small and surrounded by trees, and my skills are still more limited. I had bought and mostly built my Webbits before the Charity build had been thought of. I am waiting eagerly for April 1st for the build proper to start. Plummet Quote Link to comment Share on other sites More sharing options...
Vecchio Austriaco Posted March 22, 2011 Share Posted March 22, 2011 Hi Plummet, Do you own shares of a lead mine? For me the reason to use one of the bigger engines was to avoid having a tailheavy model. So I looked into the different threads which were growing like mushrooms and followed Timbos suggestion for a 350W+ peak engine. A2814-6 40A 1410Kv SP Brushless Outrunner Motor (giant cod)Dimension:35x36mmWeight:100g / 3.66 ozMotor shaft:4mm KV:1410 RPM Efficiency:_80% Working voltage: Ni-MH (7-10 cells) Li-Poly(2-3 cells)Working current:15-25ARecommended prop: 9.5x5 Li-Poly(11.1V)Application:1000-1900g airplanes I run it with a 10x6 prop and it lifts much more than the weight of the model. I don't want to demonstrate prop hanging - for this the control surfaces ar rather small and the flying skills of Mr. Vecchio are not sufficient But I like to have some power reserve in critical situations. Eeven with this engine in front and a 2200mAh 30C 3cell battery as far in front as possible I had to add some 80g of lead strips to get it balanced. OK I use 2 servos in the wings - but what can this add? they are 9g servos with some additional 3 g for the servo fixing and hatch and they are positioned not far from the COG. So in my opinion you need to add a lot of weight in the front or you have to cut out some sections in the tail region. As you did already fly it - how much lead (or whatever heavy stuff) did you have to add? Webiteer 37 to follow David's logic... Have a look at Vecchios Webbit Edited By Vecchio Austriaco on 22/03/2011 07:51:09 Quote Link to comment Share on other sites More sharing options...
Plummet Posted March 22, 2011 Share Posted March 22, 2011 Vecchio, No lead. I lightened the tail end in order to get the balance. I have also added some balsawork up-front to prettyfy the nose. It balances on the rear-edge of the main wing spar. I have not fitted a tailwheel, just a small ply skeg. Yesterday I did notice that the rudder was fouling the ground, so I will have to add a skid. I may add a little nose lead in due course. Plummet Quote Link to comment Share on other sites More sharing options...
Vecchio Austriaco Posted March 22, 2011 Share Posted March 22, 2011 Plummet, I made the tail end rather heavier - as I used triangular balsa to support the finn. I also I skipped the tail wheel - should work also fine without. Have a look at my solution. I use the same also on other planes and you can even handle them on the ground if you don't give too much down elevator. Quote Link to comment Share on other sites More sharing options...
David Gilder Posted March 22, 2011 Share Posted March 22, 2011 V.A. Not wishing to kill your clear enthusiasm but can I please ask you to refrain from posting pictures of you Webbit till April. By seeing these pics, other builders will see what you have done prior to the build!! We are trying to avoid this!! Cheers Dave Quote Link to comment Share on other sites More sharing options...
Vecchio Austriaco Posted March 22, 2011 Share Posted March 22, 2011 No problem - they can easily be removed ... May I ask one of our honourable moderators to do so? VAEdited By Vecchio Austriaco on 22/03/2011 10:36:43 Quote Link to comment Share on other sites More sharing options...
David Gilder Posted March 22, 2011 Share Posted March 22, 2011 Many Thanks Sorry to be party pooper!!!! lol (Theres no isue if you send a pm to each other with pics..... just not in the threads yet!!!) Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted March 22, 2011 Share Posted March 22, 2011 Posted by David Gilder on 22/03/2011 10:28:25: V.A. Not wishing to kill your clear enthusiasm but can I please ask you to refrain from posting pictures of you Webbit till April. By seeing these pics, other builders will see what you have done prior to the build!! We are trying to avoid this!! Cheers Dave Oh dear, I saws them, does that mean I will have to be eliminated? Maybe another thread for those who have finished, with a warning that tnhose still to build are not allowed to look Quote Link to comment Share on other sites More sharing options...
David Gilder Posted March 22, 2011 Share Posted March 22, 2011 Steve, I dont really think a new thread is required..... After all Theres only 9 days till the build starts and I dont think many people have finished so wouldnt have many picsin it!! Once the Build starts we will create a thread for people to post pics of their finished Webbits!! And of course your not eliminated!! (It would mean both of us would be!!) Dave Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted March 22, 2011 Share Posted March 22, 2011 Posted by David Gilder on 22/03/2011 10:56:48: Steve, I dont really think a new thread is required..... After all Theres only 9 days till the build starts and I dont think many people have finished so wouldnt have many picsin it!! Once the Build starts we will create a thread for people to post pics of their finished Webbits!! And of course your not eliminated!! (It would mean both of us would be!!) Dave I thought maybe a thread called "This is not a Webbit thread" Thye pictures of the one I am building are all in my albums, will probably make it public in May, assuming it gets finished, as the owner seems to have lost interest, and I have another project I want to finish first, though the Webbit wing is finished, it is only to cover the fuselage and tail now. Quote Link to comment Share on other sites More sharing options...
r6dan Posted March 22, 2011 Share Posted March 22, 2011 David, Steve... you cheats!!!! Quote Link to comment Share on other sites More sharing options...
David Gilder Posted March 22, 2011 Share Posted March 22, 2011 Cheats??? Moi??!! NEVER!!! Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted March 22, 2011 Share Posted March 22, 2011 Never. There was a resolution passed to say we could oppen the box and lay out the parts, solely for the preservation of the parts. Did nothing that wasn't covered by the resolution, honest In actual fact, I have never claimed to be part of the group starting in April, and have never claimed I have not started building anything, it is not even mine, though that is is questionable at the moment, as it may become mine. Quote Link to comment Share on other sites More sharing options...
Plummet Posted March 22, 2011 Share Posted March 22, 2011 I have done questionable things, but, Moderators calm yourselves, I'm not going to talk about them here. P Edited By Plummet on 22/03/2011 11:30:57 Quote Link to comment Share on other sites More sharing options...
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