|Thread: Convert Black Diamond|
I have changed the front wheel to a normal landing gear so now the problems during takeoff and landing (on grass) is OK. It is not as neat but works much, much better!
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)
* = values of the original model from Trevor Hewsons web www.bartonhewsons.uk
Today was the maiden. Some steering problems at the start (I should change the landing gear) but well up in the air the model flew without problems. Only three clicks on the aileron trim.
Weight including 3s 1500 mAh LiPo is 813 grams. Need help figuring out the wing load in grams / dm 2
Today's flights became OK by the present club members. They really liked the model.
Gluing the outer wing panels
26 soldering points completes the twin powertrain.
Missing is LiPo between 1000 -1500 mAh 3s should be about right or..?
Thanks Trevor for the reminder on side area. I have now made a cardboard profile which represent lateral surface of both the original and also with my fuselage.
Black Diamond's original cardboard profile. First line to find the center of the lateral area (CLA).
Second and third line and the CLA is found.
After changed to my fuselage and added the nacelles are CLA 25 mm further forward (red lines). How important is it? Need for more fin area?
I will return about the model's weight.
Dressed with SoLite. The next step is to glue the outer wing panels and tailplane.
|Thread: The Atom Special|
Greetings from the highly unofficial "Atom Club" in Gävle, Sweden. We are three (3) members, two with ready Atom (maiden this day) and one under construction (uses the G2 for now).
We tried first to start from the ground but it was not so good...
How it works much better...
Conclusion: One Atom flew but only right turns although full left rudder. What can be the reason?
The other Atom must have more shims!
Anyway, we got some exercise and fresh air this day!
|Thread: Convert Black Diamond|
Thanks Trevor for interesting info about the main wheel placement.
I always fly on the grass and thinking first try with the wheel placement as the picture below. If it does not work, I have the option to replace (with 3 screws) to another construction (trial and error).
After some thinking and working with a jigsaw: Parts of the main landing gear.
Two hatches, one for battery + ESC's (front) and one for the Rx (behind).
I will not have V-tail mix, but I use Diffrential thrust mix into the motors, as in my model Bronco (see **LINK**), so there will be no problems with directional stability on the ground.
Posted by Trevor on 08/05/2015 09:05:14
Have you started to think about colour schemes yet? I'll be interested to see whether you go down the bird/reptilian, fantasy full size or pure abstract routes!
I have not yet thought much about the color scheme, I am too busy with construction. Right now the hatch for LiPo and still no straight lines to refere to! I'm also thinking how attachment of the LG to be made. / Tomas D.
Construction of fuselage. Much work with templates for fuselage side to fit to the wing. If I designed the model in a CAD program, has it become easier then? I do not know because I am a novice in the CAD drawing.
Edited By Tomas Dunker on 07/05/2015 18:13:07
Control what LiPo, ESC and Rx must be mounted so that the center of gravity will come right. I will do the fuselage slightly longer (than in the drawing) to have a little margin.
Edited By Tomas Dunker on 30/04/2015 16:41:26
Time to cover the tailplane before installation. Strips to reinforce the attachment between the halves and mounting tail against the wing. (Apologize for my bad english but I do my very best)
Question: 'The part' located between the aileron and inboard wing panel (see attached picture), what is its function? Can I extend the aileron so it ends against the inboard wing panels?
Dihedral braces between inboard / outboard wing panels
The construction of the nacelles
Outer nacelle-side in line with rib w5.
Motor former and inner nacelle side.
Test mounting motors.
Glue together the inboard wing panels.
Next comes the hardest part: Motor nacelles!
I have done nacelles earlier on a wing with constantchord and without dihedral, see my website >> **LINK**
On Black Diamond this becomes more difficult with all these angles!
First, I made templates from cardboard to see how and if it works?
Edited By Tomas Dunker on 01/04/2015 16:11:54
Servo for one of the elevators.