Dete Hasse
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**LINK** Link to HK above 0.8 mm FG sheet
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Hi Hendi, The blades are not hard to make. I have pictures on page 73. There is no need to use 2 x 1/4" hard wood on the leading edge. I used poplar and spruce as that is what I had. my blades are a bit heavy but it doesn't affect the flying. There is more info on the Panther forum. The FG plate 0.8mm was critical to get mine to fly well. It was unflyable with 1.0mm FG and was transformed by the thinner plate and is now 'fairly easy' to fly but requires constant attention during flight. I got mine from Hobby King in 10 days to Australia at the cheapest postage rate. Yes Our Dollar is crook too and things are 30% dearer. It was worth it! ( I find a link later) I think I took the hard road but it was worth it. The Atom comes on every flying outing now. For what it's worth, Cheers Dete
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Hello, Sorry I've been a bit quiet due to having a testing session about 4 weeks ago and my Atom coming to grief and suffering minor damage. Repairs done, I had to wait for another opportunity. Time to reflect. A little more left rotor (aileron) and more forward rotor (elevator) trim was required. Remember I now have the correct 0.8 mm rotor plate. Well today was it. And It all came together!!!! spin up good. I jogged along with it as it spun up so she didn't get to far away. Then lift off was pretty text book as in other videos. Not easy to fly but then no drama once I settled in. I had 3 flights of about 4 minutes each. Boy am I stoked. It's been a long time reaching success. Thanks Rich. I'm even thinking that my Panther is repairable and I might have another go with it. Cheers D
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Hi Rich, Thanks for the reply about the plate thickness. I'm reading between the lines and assuming that the amount of flex is the key to the blades self adjusting their pitch to the varying load during rotation (advancing or receding) . So my question before I embark on an experiment, is there any way to measure the amount of flex required of the plate? If it's just emperical, how do I know when I have a plate that will work with a specific set of blades (as they are made differently by various persons and not by a machine)? Do we look for a certain upward curve when the auto- gyro is suspended buy the rotor tips for instance? If Any suggestions would be welcome and as I have a couple of weeks to wait on HK I will try it out and report back Cheers D
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HK international warehouse has 0.8mm FG sheet. (as well as 0.5 1.0 1.5mm sizes and CF sheet as well). I have ordered some and will be about 2 weeks to ship here. Slow and steady, but I will fly one day. I'll let you know how I go. Cheers D
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My blades are repaired and now have a pronounced sharp LE very similar to Terry W's diagram. Now I had an Ah Haa moment when reading your reply. Thank-you Frank! I couldn't get 0.8mm FG sheet either so I used 1.0mm approx also. My flight symptoms sound just like yours and Steve J's experiment was revealing also. I'm learning the hard way. So Steve you suggest that I could make some 0.8mm sheet. I would like to try. How do you suggest it could be done. I have all materials to hand, glass cloth and west systems epoxy. It seems the flexibility of the plate is the key so Terry's Idea using the test rig may be very useful too. Thank you all. My enthusiasm has returned. Cheers
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Trimming didn't go well. Rotors very slow to spin up . Sitting on the ground they would spin in reverse. I had to hand start them anti clock wise. Always rolling left into tip over. Got better with Right aileron trim. Finally taxiing a long way to get them spinning (70 meters ) , too far to attempt lift of. She got light on her wheels at one point and rolled left damaged the rotor blades and cut off the left fin. I have 0.8mm shims as described. During repairs I will re-profile the blades to look more like these (Terry Whiting 1 posted airfoil diagram on the 19. 4.2012) I think my high point of the section is too far forward. Other than that, and the fact that I haven't got my head around it, I don't quite know what the problem is. Cheers Dete
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Hi Terry and Rich I'll take your advice and approach the test flying with small trimming hops. I'll let you know how it goes. Maybe in a few days time as the weather forecast is terrible for the next few days/possibly a week. It's windy and snowed in the nearby hills yesterday (a once in 20 year event) I'm still a bit nervous about my forward C of G. (19 deg hang angle) Rich should I get a lighter battery, or add a little tail weight? Cheers Dete
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Almost there. Last minute checks were revealing. Don't laugh at this. I used a 4 channel (36 meg) RX for its compactness. I couldn't set up ELEVON mixer on my JR 2720 set that would work, so I went back to first principals and used the free mixers. One for AIL to ELE 100% and the other ELE to AIL 100%. This wan't hard but was a eureka moment for me. I've only had the set 10 years and never had to use this facility as I always had spare RX channels and thus used the pre mixers. Next thing was the CG. I moved the RX behind the post and used hot melt glue to keep it and the wires neat. The range check is OK with the motor going so I just have to wait for the wind and rain to stop. Cheers D
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I forgot to mention that I tried to pull a canopy from a drink bottle as is common here, but without success. I used a piece of PETG 0.8mm that I got from HK and stapled it onto 2 half inch square pine. I then heated it to floppy heat over an electric bar radiator lying on its back, ie heat facing up. and quickly pulled it over the plug (wearing leather gloves. This worked well as you can see. Just need to add the blades The last thing to do is to fit the receiver, velcro to hold the battery down and final servo adjustments range check. Getting very near to finished
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Hi there, Back from a few weeks in the north. Looovely! Sorry to see dad laid up I wish him well and hope he can get back to flying soon. Now, I've been a bit slack with the posts and quite a lot of progress has been made. The HK head, servos and prop arrived while I was away and I got so busy that I didn't take too many Pics. Anyway I followed the plans and today I put on stripes and did a hang test with the battery installed. I used an andriod phone app called Bubble. It's a spirit level that can measure angles. My atom hangs with the tail boom at -19 degrees. Any comments? Photo's to follow Cheers PS its going to snow on the nearby hills so its still chilly down here!
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Mark, I'm not too skilled at using a belt sander on balsa. Like all modelling, there is no right or wrong way, just different ways. I'm happy to share mine. Thing may slow for a couple of weeks as I'm traveling north. Cheers
