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Member postings for Richard Harris

Here is a list of all the postings Richard Harris has made in our forums. Click on a thread name to jump to the thread.

Thread: Model flying photos you're proud of
13/10/2019 10:54:39

Taken this year, Team Renegade with their PB Bullets.fb_img_1570959904903.jpg

And a not so fixed wing biased snap at one of our autogyro fly ins, lots going on.

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Thread: Revolver Pusher type Autogyro trainer
02/10/2019 16:35:31
Posted by Gary Fentiman on 02/10/2019 15:05:41:

This looks like a great build Anyone know where I can get a set of plans from please?

Gary,

Sometimes back issues are still available which include the plan and write up, best person to guide you in the right direction is David Ashby, if he doesn't see this send him a PM.

Failing that Sarik hobbies sell the plan, part kit and canopy if you look HERE.

Rich

01/10/2019 21:10:49

I have been looking forward to this Trevor, well documented as usual. You will have to find another 'winter project' at this rate.

Rich

31/08/2019 21:15:01

Resistance is futile Trevor, you will have that together before the winter is set in!

Here is where I'm at with my second Revolver, fin only with a cranked boom giving me room to lower the motor.

The blue canopy may not be fitted as I'm awaiting a vac formed version from SARIK hobbies off my plug.

 

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Edited By Richard Harris on 31/08/2019 21:17:07

30/08/2019 15:40:46

Hi Mike,

With a 3 blade rotor system I aim for an aspect ratio of around 10:1, length is determined by the weight of the model and whether I want it to fly lightly loaded or not, this aspect ratio increases with 2 blades with a like for like model as you need an increase in blade length.

When I first started messing most were using a Clarke Y aerofoil or a similar section with a chamfered lower TE. Through experimentation (and a bit of luck) I came up with a section that has a sharp LE, this is what I use on pretty much all my models from about 2010. They have a good spin up, plenty of lift and above all are easy to make.

Rich

28/08/2019 21:08:32

David,

If your blades are close to the fin when tilted right back then that is more than enough for them to spin up with a slow taxi into wind.

On Saturday they did seem to take a little longer to get to full RPM, once in the air they were fine with lots of lift. What I would do is add extra shim to each blade, only thin shims, I find that masking tape works ok.

Try that and see if this improves spin up? you will find that by adding extra shim you may need to add a click of extra rearward tilt.

You could also try hand launching? I know Chris from down under swears by this, I'm sure he made a video of how he does it too.

Talking of videos here is the small amount of footage I captured of your first flight with an autogyro including the landing.

Rich

Thread: New Poll - sticky situations.....
26/08/2019 21:18:58

Everytime time for me along with blood on pretty much every model I have built.

Edited By Richard Harris on 26/08/2019 21:19:37

Thread: Revolver Pusher type Autogyro trainer
26/08/2019 21:14:39

It was a pleasure meeting Dave with his Nellie Revolver last weekend st the Nationals.

No issues were encountered, all that was required was a few clicks of rudder trim. Dave was soon doing circuits for the first time and I think he was pleased with his results.

Unfortunately I only had my phone on me but I did grab a few photos and a minutes worth of footage.

 

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Edited By Richard Harris on 26/08/2019 21:15:10

Edited By Richard Harris on 26/08/2019 21:15:29

20/08/2019 16:35:13

David,

Sounds like a plan, PM sent. Weather is looking really good for the weekend smile

Rich

20/08/2019 09:36:42

David,

I really like what you have done with your Revolver smile d

Regarding the Fly In I am hoping to go but nothing is set in stone at the moment, I do fly mode 1 and would be more than happy to maiden and trim out your Revolver.

Not sure if you go or not but I'm off to the Nationals this coming weekend, I will slip mine into the caravan in hope that I can get some stick time on the evening RC line. If you do happen to be going then bring it along?

Rich

18/08/2019 10:31:39

Tim,

Horizontal Stabs act as pitch dampeners giving the ability to stabilize an autogyro with a thrust line offset to the CG (vertically) as does the drag from the rotor disc. As long as the thrust line is close to the CG in height the horizontal stab can be removed.

Yaw is effected by the motor torque and prop wash, it can be increased or decreased by either moving the motor/ rotor spindle to the side or the position of the vertical fin and its area from the prop. It can also be controlled via mixing of radio inputs at different throttle settings.

The stab does make a good mounting point for the outer fins, these were added to give about 25% of added extra vertical area out in unblocked air for added stability when the motor is off.

As I am removing this the extra vertical area it will be added to the standard fin.

Rich

18/08/2019 09:47:32

Chris,

Can't say I have ever noticed a visual issue, that said, I do fly my autogyros at close quarters 90% of the time.

Removing horizontal tails opens up the flight envelope making the autogyro cleaner in higher winds, which seems to be a growing trend over here at the moment! It removes the pitching that can be caused by upward draughts acting on the tail end.

I remember a conversation with the late Wing Commander Ken Wallis where he had just demonstrated 'Zeus' in near 30mph winds doing his usual 'hands off' flying. After he had landed I asked him what it felt like in the wind, his answer was simply 'what wind'! He then went on to explain in great detail the effects of horizontal stabilzers in windy conditions and how his 'fin only' machines were unaffected, it was quite interesting.

You ought to try converting one of yours, just to see?

Rich

17/08/2019 17:43:55

As the lads have said Cuban it will be fine. In fact, 15mm is pretty good.

Just finishing off my second revolver II, this has a cranked tail boom so I can get the thrust line bang on, I can do away with the horizontal tail surfaces this way and hopefully make it a little more lively.

Will post some photos when it's completed.

Rich

Thread: The Atom Bomber
02/08/2019 16:23:58

As promised here is a short video I made last Sunday, it was quite dull and a tad windy but you can see how floaty this model is. With this light rotor loading I should be able to carry a bit of weight in the bay.

More soon I hope.

Rich

Thread: Revolver Pusher type Autogyro trainer
31/07/2019 15:06:09

I agree Cuban, there should be at lease a thread or two protruding through below the nut. I am sure Malcolm will chip in when he sees this to advise but I would just get a longer M4 Cap Head and pack between the top of the head and the nyloc nut directly below Tri plate holder? You don't want  too much sticking protruding below as this can reduce the pitching movement.

 

Edited By Richard Harris on 31/07/2019 15:07:37

Thread: Mill 75 electric set up
27/07/2019 19:55:06

Thanks for the info gents I will have a scout about for something around the 50-60w mark thumbs up

Brokenenglish, ironically the Mills is in a FF Tomboy at the moment.

Rich

27/07/2019 18:29:13

I have been asked to design a model for free flight to be powered by a Mills 75. As the intended model will be experiment with possible modifications/ crashes along the way I am reluctant to install the Mills until fully sorted.

Id hate to damage the Mills so to make life easier I am thinking of going electric for the experimental stage but don't really know the kind of power output the Mills has.

Can anyone recommend a suitable like for like electric set up which would use the same diameter prop as the Mills please?

Thanks

Rich

Thread: Snap Dragon
27/07/2019 12:56:36

We had a gent turn up at our autogyro fly-in who had brought along his Snap Dragon to show me, it was a bit windy to fly it as we were getting gusts of nearly 30mph. He is going to let me know how it goes, here are a few photos I took of his immaculate example, I like the way he did his canopy. I may borrow his scheme when I get back on my larger version.

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Thread: Revolver Pusher type Autogyro trainer
23/07/2019 22:33:20

 

I have been up to Sarik hobbies and given them the canopy plug for this model, they are going to make a resin mould from it so anyone who doesn't fancy tackling you will soon be able to purchase one. They are also manufacturing a laser cut part kit which should be on their web site soon.

Last weekend I managed to take a few photos of some of the Revolvers that turned up at our annual meet between flying. Here are a few:

Out of interest, the yellow and green version at the bottom has 3D printed blades, wheel spats and tail holder, Ian who has designed these will make the files available for all once he's perfected them

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Edited By Richard Harris on 23/07/2019 22:39:37

Thread: The Atom Bomber
22/07/2019 21:05:52

Well its taken me 4 years to complete this model but I have done and test flew it last weekend at our annual autogyro fly - in.

As you can see I altered the tailplane and opted for Tee tail version, the mast was broken on the Friday evening but my friend gave me a swept 10mm carbon fibre post of an old model which worked out ok. I will make up an alloy mast in the coming weeks to replace it.

Despite the 20mph winds gusting to nearly 30 it flew really well, though I need to practice my bomb dropping technique as the light foam whistling lidle bomb missed the target every time, great fun!

AUW is 1600grames with a 75" 2 bladed rotor so its a floater.

When I get chance I will capture some video.

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