Member postings for Tomas Dunker

It seems that I will not get the May and June issue of RCM&E but is it possible in some way to get the plan of Wunbesix from the June issue?

Does anyone know the reason why we in Sweden have not yet received the May (and June) issue of RCM&E?

Is this true?

"The British newspapers do not come to Sweden anymore.
Many British magazines have stopped publishing in paper form and have gone digital.
Can't say if RCM&E will only be available digitally in the future butit does not appear to be in paper form in the near future."

What happened to the title of RCM&E, September 2019? Instead of RCM&E it says R/C MODEL Aeroplane!See

Edited By Tomas Dunker on 12/08/2019 17:53:46

The above link is not for Cliffwhacker wood kit?

Earlier in the thread it says:
a wood completion set is available from the Plans Service.
But I can not find where I can order this?

Sorry John, I've been retired now and have new addresses.
Mail: tomas.dunker@gmail.com
My webpage: http://www.tomasdunker.se/modell/

Some pictures to clarify my previous post.

I really like Peter Fardells model The Chub (RCM&E Dec 2014) so now I am considering to enlarge the plan to do the model for a small brushless motor and RC.
Do the flight characteristics change if I enlarges all dimensions "straight off" for example 170%?
Can I use the same rib profile?

/ Tomas Dunker

Thanks Rich, now I understand why my Atom is so 'unruly' in the air.
Instead of making a new plate (hard to get 0.8 mm glass fiber in Sweden) I am considering to drill small holes
(1-2 mm dia) according to attached picture, to get my 1 mm plate more flexible.
Could it be a good option?

What happens with the flight characteristics when the head plate is stiffer?

What happens with the flight characteristics when the head plate is 1 mm thick instead of 0,8 mm?

Suddenly it looks very strangely out here on the forum, what happened?

I discovered that my fiber glass head plate is 1 mm thick (even though I ordered 0.8 mm).
Is that why my Atom is so difficult to fly? Head plate is too stiff?
If so, can I modify it in any way?

We are two experienced model aviators who built respectively Atom autogyro. One with AJ-blade and the other with home-made blade.
We have closely followed the setting of angles, rudder travel and center of gravity according to the construction manual. We also checked the radio range control.

At the start, we have always been sure that the rotor come up at the right speed, "whistling" sound.
So far everything is OK but once in the air the models is out of control (same for both models).

If I compare with a fixwing plane it is, as if the center of gravity is too far back and too much rudder travel!?
You have to constantly try to compensate for the wild behavior Atom does in the air.
After many attempts, which always made in low or no wind, remains the problem.
What can it depend on?

To check, I weighed my Black Diamond again and the model without LiPo weighs 680 grams and with one of my batteries (Gravity 3's 1.55 Ah = 138 gr or Turnigy 3s 1.50 Ah = 128 gr), is the model's overall weight approximately 814 grams.

Edited By Tomas Dunker on 25/07/2015 08:43:49

DATAFILE for my Black Diamond:
Wingspan: 1300 mm
All-up weight: 814 gram (*1lb 12oz)
Wing area: 32 dm2 (*500 sqin)
Wing loading: 25 gram/dm2 (*8oz/sqft)
Puwer system: Turnigy 2x SK3 2822 1740 kV, 2x 18A ESC, 3s 1,5 Ah LiPo, 8x4 APC prop (2x counterrotating)
Covering: SoLite
* = values of the original model from Trevor Hewsons web www.bartonhewsons.uk

Edited By Tomas Dunker on 21/07/2015 10:10:01

I opted for safety to put the center of gravity about 10 mm forward the drawing's CG.
How sensitive is Black Diamond's flight characteristics for this?
I think that the model has some low glide ratio. Could it depend on the above?
I tried a landing with a little less speed, and then it looked like this:
See >> **LINK**