National Free Flight Society

SEN 2823

  1. International Travel aka  SEN 2822
  2. F1S (and F1Q) ESC News
  3. Time in the Engineering Lab

International Travel aka  SEN 2822

From: Michael J Woodhouse
A weekend flying in Norway equals a month of lock down! = 1day travel 10 days isolation 2 days contest 1 day coming home and another 10 days locked up. I managed to get to all the holiday on Ice contests every year was different and fun. It was always hard graft dragging the gear out onto the ice. By the time the stooge was knocked in and sorted one felt like a days flying had already been done. Great times with great folks I may make it in 2022?

Michael Woodhouse

F1S (and F1Q) ESC News

Keep up to date with the moving electrons.
Tapio Linkosalo on FB
A new version of my E-36 timer and The old one used the BEC from the timer to power the microcontroller and servo. This new one has a voltage regulator on board, so it can be powered directly from the 2S motor battery, and thus I can use the drone ESCs that are without an ESC to drive the motor. The idea came from my F1A and F1B timers, that have the regulator as they use 2S batteries for motive power. When I adapted one of those as a F1Q timer, I realized how handy it is to power the timer directly from the motor battery, and not via the ESC!

Comment: Michael Achterberg
Please explain the advantage to this?
Is there a major weight savings? Very stupid about electronics. Sorry

Comment: Roger Morrell
What is the advantage in using a Drone ESC? Are they smaller? Do they accept the “standard” servo control input ? Can you give an example/link to of a “typical” one that does not have a BEC?

Comment: Chris Edge
around these parts, a lot of the favoured ESCs no longer come with a BEC so what
Tapio has done makes a lot of sense. If there is also a tapping that allows you to run an altimeter/GPS/Haggis alert off the timer then that’s even better. CHE

Tapio Linkosalo
Exactly as Chris points out. The cutting edge of small ESCs are currently the ones intended for drone use, and as a drone has four of them (one for each motor), they save complexity by leaving the retardant ESCs out. You can get a 30 amp ESC weighing 4 grams, with Arm32 processor and BlHeli software installed, and most likely with the newest and most efficient FETs. And yes, they work exactly as the old ones with “servo” input signals (although they also understand more modern control protocols).

Comment: Tapio Linkosalo
In my F1Q I currently use a Gemfan Maverick 30A ESC, and for a trial I recently bought a Turnigy Multistar 33A ESC. Both are Arm32 and BlHeli ones.

Comment:Roger Morrell
It is of interest because I make timers intended for F1A that have a voltage regulator that is big enough to run the Servos and other items such RDT etc. I just have never put the F1Q or F1S firmware in them. Not all that hard to do.

Comment:Tapio Linkosalo
My first attempts to make a F1Q timer I made omitting the timer onboard voltage regulator, jumping the Vin and Vout pins on the timer PCB. But I had some strange issues with that. So more recently I just unconnected the V+ pin from the ESC (with BEC) and connected the battery balance connector to the timer power input. Everything worked like charm. But my E-36 timer still used the BEC to power the timer. So when it turned out that an increasing number of ESCs are without the BEC, the solution was obvious. And the solution seems to work! (But not at first attempt though – I had to add a cap parallel to the regulator output, without that the timer resetted every time the motor powered up. But one cap cured that problem.)


 Time in the Engineering Lab

Our spies reported that when  at UC Santa Barbara Taron or Sevak were either in the Gym or engineering lab.  From this report on FB we see that Taron’s time in the engineering lab was well spent

Taron Malkhasyan on FB
Free Flight
Many inquired regarding the production process of the GTS kits and especially the CNC’d wings. Put together a short video to better showcase the process.

GTS DLG Wing CNC Milling

GTS Customer files:

Commnent : Eugene Drake
That is slick !

Comment: Sevak Malkhasyan

Eugene Drake  Enjoy it! They’re a lot of fun, and FAST!

Comment: David Lindley
well done!

Comment: Don DeLoach
Awesome job fellas!

Comment:  Tapio Linkosalo
You cut the outline of the wing first, before shaping the airfoil? I did all the cutting from a solid piece of wood…

Comment: Taron Malkhasyan
Tapio Linkosalo yes I cut it out with a 1mm end mill before going in with a 3mm ball mill in 45 degree passes

Comment: Tapio Linkosalo
Ok. I prefer to use the “block” as reference especially when flipping it over and milling the bottom. Note the small ply tab on the right end (wing root)? That is actually a reference point of the wood thickness so that I get the Z-axis right independent of small variations in the sheet thickness. (on one side the milling base is the reference surface, and on the other it is the ply tab.(
Tapio showed a picture of his similar work)

Comment:  Mark Benns
Taron Malkhasyan that’s a great idea 45 degree… I have tried 90 but not brilliant

Comment: Tapio Linkosalo
Mark definitely worth trying. As can be seen in the picture above, my wings have visible grooves (they do not feel as much as they show), from the router ball tip cutter. I have considered to run another pass perpendicular to the first, but making both passes at 45 degrees might be even better idea.