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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

Steve Jones 227/04/2016 09:16:58
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476 forum posts
346 photos

Thomas, PM me your address and I will send one

Steve

Richard Harris27/04/2016 21:43:44
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1907 forum posts
1735 photos

Tomas,

It should make it more flexible, my only concern is it may create a weak point. I have tried this myself and it did work but I ended up breaking a plate, it was on a much larger model though with 75" blades, I will try and find a photo of it.

Rich

Peter Hill09/06/2016 14:29:47
19 forum posts

Hi. Not new to this forum but can't remember if I have ever posted here! When making blades for the Atom or even the Cruiser, does the leading edge have to be spruce? I only ask as I have a stock of pine strip that I would like to find a use for smiley. Also I know you have to balance the blades chordwise to obtain c of g but I have also seen at least one post where blades are balanced spanwise but not everone seems to do this last step, so I was wondering if spanwise balance is crucial or not? Sorry for all the questions.

regards Pete.

Steve Jones 209/06/2016 15:01:29
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476 forum posts
346 photos

Pine or spruce is ok , 6mm square or 6x9mm... Remember to keep leading edge sharp not full radius

Yes balance blades span and cord wise

Steve

Martin McIntosh09/06/2016 15:12:55
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2138 forum posts
895 photos

Balancing span wise is the crucial bit. I put the spruce 1/4" behind the balsa LE so that I did not have the bother of shaping it.

Peter Hill09/06/2016 18:05:02
19 forum posts

Thanks for the quick replies. Actually Steve it was your post way back on page 7 where I saw the spanwise balancing.Thanks.

Pete.

Steve Jones 213/06/2016 16:09:28
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476 forum posts
346 photos

Fantastic Day at Chiltern Club, Thank Tim, and another Atom joined the fleet - Beautiful model built by a lovely Gent Robin (I think ..)

image.jpeg

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The faultless Maiden that was then expertly flown by our Mode 2 test pilot Rich E was never in doubt yeswink

Steve

Peter Hill19/06/2016 08:13:12
19 forum posts

Decided I'm going to build the Atom. So far all parts cut and blade blanks made. I keep re-reading this thread till my head hurts! Just a question about flying.......so,you start a turn using rudder ,let's say left turn and then opposite roll (right) to flatten the turn. Is this correct or have I got it completely wrong?!

Pete.

Ozgur Sar20/06/2016 08:19:00
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28 forum posts

Hello Peter,

I didn't read how others are turning but I'm turning how you described.

First I start the manouver with rudder then use counter aileron to balance the left or right bank to flatten the turn. If you use only aileron to turn like an airplane it causes unwanted movements or just isn't enough.

Peter Hill20/06/2016 16:20:33
19 forum posts

Thankyou Ozgur. Just wanted to be sure. Bit different to how I fly my fixed wing models. "More rudder? What's that?" lol.

Pete.

Ozgur Sar20/06/2016 16:25:08
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28 forum posts

Your welcome Pete,

I fly both helicopters and planes but autogyros are different than both.
Yes, you have to use rudder a lot but you will get the feeling quickly after a few flights.

By the way, take off was the hardest thing to get used to for me because you have to pull elevator to get the blades turn faster during take off run, but you have to get the elevator back to neutral position as soon as you are off the ground. If you do not do that model flips back so quickly ending with a possible broken mast. Also make sure that blades have enough headspeed.

Peter Hill20/06/2016 17:26:27
19 forum posts

Thanks Ozgur for the advice. Still building at the moment but will try and take onboard everything you and everyone else on this thread have said when the time comes to fly my Atom. Ooooh! I'm getting nervous just thinking about it.!

Pete.

Richard Harris21/06/2016 07:52:28
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1907 forum posts
1735 photos

Peter,

Try not to get to wrapped up in using the rudder as the Atom will fly fine just using roll, the circuits will obviously be larger. There are two things you must avoid, the first is never bank the Atom more than about 45 degrees, any more than this and it will drop away. The second is keep it in as close as you can, if you get distance between you and the model things can soon get out of hand. Also for the first flights try sticking with left hand circuits.

Ozgur's explination of rudder turns is bang on, these can be attempted after and you you can really get a tight turn out of the Atom.

Once you have got those first flights under your gyro belt you will not look back, I am a thourough bread fixed wing pilot, not keen on helis and an autogyro is the most versatile aircraft I have ever flown.

Good luck with your Atom and be sure to ask any questions.

Rich

Peter Hill21/06/2016 18:21:46
19 forum posts

Thanks Rich

I also have the RCM&E issue with the Panther plan. If I have success with the Atom I may build that too. Am I correct that the blade mount hole on the Panther blades are drilled on the chordwise balance line and not 1mm behind chord balance line as on the Atom? If so, is there a reason why they are different? Sorry for all the questions but I am determined to build an autogyro and just want to get my facts straight.

Pete.

Richard Harris21/06/2016 22:41:51
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1907 forum posts
1735 photos

Pete,

As each model has been designed there are improvements . The mounting hole for the blade was moved back to compensate for heavier covering if they were balanced before hand. I wouldn't worry to much about it at this stage.

Dont forget a few build photos as you go along smiley

Rich

Peter Hill21/06/2016 23:00:27
19 forum posts

Thanks Rich. I'll do my best to provide some photos.

Pete.

andrew richards12/07/2016 21:27:32
1 forum posts

hi guys , i have build a atom as well but i cant get it to take off , the blades spool up on take off but , when it lifts off it tips hard to the left and hits the deck , any advice at all , my dads got the same problem could any body suggest what could be the problem .

Richard Harris12/07/2016 22:36:18
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1907 forum posts
1735 photos

Hi Andrew and welcome to the forum,

This is an easy one to answer, your blades are simply not up to full RPM. If its rolling over you ground speed is a little fast. Think of it as trying to take a fixed wing off with just half a wing, it will just roll over.

What you need to do is sit your Atom into wind (I prefer a light wind), pull and hold back the rotors and give them a stiff flick in a anti clockwise rotation. They should spin up with the model sat stationary, if they dont slightly move forward at no more than a slow walking pace. As they gather speed slowly move the rotor back into the neutral position (still moving forwards slowly). You should hear a distinctive whistle come from the blades, when you hear this increase throttle until your atom leaves terra firma. Try small hops at first and trim in between until minimal input is needed, the more throttle you apply the more it will climb.

Let us know how it goes as we have all been there? dont forget we have our annual Gyronuts gathering in a few weeks time, if you can get there bring yours and your dad's Atoms along and we will soon sort them out and give you a few tips.

Rich

Nigel Banham16/07/2016 18:33:44
11 forum posts
4 photos

Hi Everyone,

Mine is an IC Atom with an ASP12 on an 8x4 prop. (I like engines) I built it in 2014/15 but until today, I have never flown it nor any other autogyro!! I was waiting for a steady breeze - blowing nicely this morning. My first takeoff, with the rotor spinning well showed that it was way over elevated. To maintain S&L I had the stick almost as far as it would go forward. Quick untidy landing - broken prop but ok otherwise.

The next take-off - after trimming was better and I managed about six circuits of the field.....getting the hang of it. A fast flyer with this set-up... G of G a bit forward?? However - I then did a downwind turn with a bit too much bank on.....it came down like a man-hole cover and I could not pull it out in time. I have just read Richard Harris's post about shallow turns - I learned that the hard way.

Quite a lot of repair to do now - A lesson learned!!!

But - the bug has bitten. I will repair this and am thinking of building another...

Nigel Banham

Ian Jones16/07/2016 22:52:36
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3145 forum posts
1372 photos

Hi Nigel, you've got further than me but I too will be fitting an engine, an AP .15 Hornet. Sound slike I'll have to gently on the throttle though.

I'd be very interested to see how you mounted your engine.

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