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what thickness of foamboard are youusing? |
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If you expect to be successful in this hobby, 'start off' with finding a successful design and do exactly the same. Then venture off in the world of model aviation exploration now that you have a basis to work from.
Oh and buy a wattmeter. The most important tool you need if your playing around with electrons. Without one, your just guessing. |
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Looking forward to seeing results, didnt have time today to try a sort of KFM on my battered yak. will do it tomorrow. its all of 20 minutes work. |
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Going to try to fly it later today, taking the v-cam, but it's not dependable.
I had a piece of foam left about the size of the KFM section and it weighed 24g. That would be 48g plus the glue add the weight of a spar and glue. I did put a strip of filament tape top and bottom. I just did a wild guess on the CoG at 33% at the fuselage. Put it just at the front of the canopy. I also have a new 1000mm Edge 540 to fly today. |
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http://www.trade-point.co.uk/departm...1570772_TP.prd 8gbp for 800x6000. it looks like it is 6 sheets that fold up so could be 800x1000m for each section. |
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CoG was dead on, three clicks up trim for perfect flight. No rudder or aileron trim needed. Flies
like a dream. One problem, flight time is 4 minutes with about 10% left in the battery. Plenty of power but is slows very quickly. The leading edge is a square, three thickness of foam board. I am going to round it off nicely and see if that helps. For a spur of the moment build, about four hours total time, two sheets of foam, some used electronics, it is a pretty nice plane. Three flights today, no video, and the motor mount pulled loose, no damage, just not a good glue joint. Working too fast I think. BTW, wind was 10 to 15 mph. |
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I am hoping the rounded leading edge will improve the flight times. I only do five or six minutes
tops. Age thing. Motor mount is fixed and the wing is rounded, and covered with packing tape. Just the leading edge. 1" tape. Another thing, the wind today required aggressive flying. Tomorrow maybe. |
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I just fitting my "kfm" airfoil on the top of the wing. It is adding some strength to the wing but they can still flap from presure on the tips of the wings, better than it was before. Noticable weight increase. Discovered that thepaper on hobbycraft foamboard (west) is really easy to remove. Just soak it in water for a couple minutes and the paper just peels off, if anything remains you can roll it off with your fingers. theres still layer of something left behind, looks like another layer of paper but i guess thats the glue. Definate weight saving could be as much as 50% removing both sides. I cut out a 10cmx10cm piece, weighed it on my terrible anologue scales (5g increment markers) the square weight what looked just under 5g. Once the paper was removed there was n oticable weight difference looked almost have to maybe 2g. Might be worth building one with the paper removed (and using larger carbon rod spars), the only worry is this stuff i think is quite brittle, without the paper im sure it cracks easily. Hopefully get out today to test the new airfoil although it is quite windy. |
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managed to get a flight today after doing the wing . quite windy today but plane seemed to handle it very well and i think my wing rocking at slow speed has improved greatly. will need a calm day to test properly. i was able to float into the wind with minor aileron corrections.
flight times seem not to be effected. Unfortunately on my 2nd flight i decided that i could move the CG back (pretty sure im nose heavy) and had the battery eject itself mid flight... I though there was till enough friction in the battery tray with it sticking out to hold it in place, obviously not. When i turned round to start heading back into the field, there was the distinct passanger abandoning ship and then it went dead. Thought i had gotten away with it as they plane just seemed to float level until it disapeared behind the folage. well, it managed to land nose first onto path which is surrounding either side by miles of soft stuff.... Battery is gone (no chance finding it in long grass and bushes). I think its time to build a new one, i weight it and its coming in a 420g!!!! plus im sure its not flying right due to everything being crooked in some way and the creases giving way in flight..... I mght just go ahead and give a go at building a paperless version and see how it stands up. |
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Last edited by bazsound; Sep 29, 2017 at 12:21 PM.
Reason: Correct poor phone typing
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