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The Atom Special

A simple to build, tough autogyro with racy looks

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in the shops 19 Sep

Phil Winks09/07/2015 19:14:47
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2674 forum posts
693 photos

My best wishes to your Dad too Richard, sounds like a true tough luck story, looking forward to flying with you at the weekend yes

Richard Elliot09/07/2015 19:46:27
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176 forum posts
115 photos

Crikey Rich , Mr H snr is really going through it lately with props! Please pass on my best to him and I'll catch you at the weekend

Rich

Dete Hasse24/07/2015 09:17:02
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22 forum posts
15 photos

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!

Dete Hasse24/07/2015 09:33:03
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22 forum posts
15 photos

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.

20150724_171340.jpg

Just need to add the blades20150724_172255.jpg

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

Dete Hasse26/07/2015 01:59:09
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22 forum posts
15 photos

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. 20150726_104147[1].jpg

The range check is OK with the motor going so I just have to wait for the wind and rain to stop. Cheers D

Terry Whiting 126/07/2015 09:49:26
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564 forum posts
359 photos

Dete,

That is exactly the same setup as mine but I used 35meg...........NEVER had the slightest problem with 35 meg with any of my and electric models yes

Cheers

Terry

Richard Harris26/07/2015 22:04:54
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1907 forum posts
1735 photos

Dete,

What a fine example you have madesmile d. The orange and blue markings contrast well on the white background, should be nice and easy to see in the air.

Good luck with the maiden, remember not to force it into the air, small hops trimming in between. Once in the air keep close in so you can see how it is reacting and its direction, things can get away so quickly.

Rich

Dete Hasse27/07/2015 01:10:04
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22 forum posts
15 photos

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

Steve Jones 227/07/2015 08:10:15
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476 forum posts
346 photos

Good luck for the test hops and flights. 19 might be a little forward, maybe a little more rear trim but see how she goes....

Steve

Frank Skilbeck27/07/2015 08:18:55
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3807 forum posts
91 photos

Just seen this might be handy for getting the blades balanced.

Dete Hasse01/08/2015 03:40:53
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22 forum posts
15 photos

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

Terry Whiting 101/08/2015 07:43:21
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564 forum posts
359 photos

Hi Dete,

Did you make the mistake in rounding the blades LE ? . The LE requires to be sharp. A rounded LE would give the blade a certain incidence which could cancel out your shim.

I made this simple hand held blade spin up tester.000_0242.jpg I found using 0.4mm shim the spin up was slow, 0.8mm spin up was fantastic, required only the slightest breeze to start spin up

Terry

Frank Skilbeck01/08/2015 08:38:18
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3807 forum posts
91 photos
Posted by Frank Skilbeck on 01/06/2015 21:14:58:

Well after an argument with a tree blush, I broke my Coolwind supplied fibreboard rotor plate, I've made a new one but this is from 1mm fibreboard vs the 0.8mm Coolwind one, so isn't quite as flexible, anybody see any problems

Well thought I'd report back, the new slightly thicker plate has not been a success, the blades seem harder to spin up and it's hard to stop it rolling to the left on take off. Only managed to get it in the air once and then it was flying fine, but take offs now almost impossible. Think I'll have to make a new head in 0.8mm plate and reset it up again.

Steve Jones 201/08/2015 08:54:35
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476 forum posts
346 photos

Hi Dete,

Your first attempts seem just like mine .. Most important advice I can give is ... Don't give up !!

Unless you have a big problem with blades, which I doubt, this issue is just not enough blade speed at take off. Rolling left is the classic sign as the advancing blade is lifting on the right and the retreating on the left is not so much.

Maybe a little more back stick held in at the start of the take off ruin, then as rotor spins up release to neutral. If fast enough then just s little more power should do it. Remember it's not about model forward speed like and aircraft - it's rotor speed which counts

Good luck and kee us posted

Steve

Steve Jones 201/08/2015 09:31:39
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476 forum posts
346 photos

Frank

Not sure on the Atom, both mine run the thin 0.8mm plate.

However I did change the plate to a 1.5mm plate on my Whippit autogyro to try and help stop tail strikes on landing - complete disaster. It turned a great model into one which just would not fly.. Al it would do is pitch violently up then crash. Changing back and my great flying keep returned

For me the answer was simple... The designer (rich) had done all the hard work and development, do best not deviate !! I would suggest you gs a replacement or make one , it's not that hard and very rewarding

Good luck

Steve

Dete Hasse02/08/2015 02:15:29
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22 forum posts
15 photos

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

Dete Hasse02/08/2015 07:36:01
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22 forum posts
15 photos

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

Terry Whiting 102/08/2015 09:07:57
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564 forum posts
359 photos

Dete,

I did send you a 'message', but I see now you have made an order for the GF yes

Richard Harris04/08/2015 09:36:30
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1907 forum posts
1735 photos

If 1mm thick FG plate is used there is no reason why my triangular plate can't be increased in size, adding an extra 30mm to the diameter should work I would think.

If I had some 1mm thick sheet I would experiment and get the correct dimensions for you, unfortunately I dont so I can only guess.

Dont give up

Rich

nigel simkin04/08/2015 18:26:02
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35 forum posts
14 photos

Has anyone got one of these for sale please?

Thanks

556566.jpg

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