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Member postings for dave windymiller

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

Thread: Rojair ME163 build
24/04/2020 22:13:39

The other Rojair model i am finishing (ME109G another thread in this section) dates back to the early 80s and the vac formed parts were glued together at the time. 40 years on I expected these to fall apart but after some flexing i concluded were still sound. The glue looks like Cyno and quite hard.

My gut feel is cyno would be too brittle but i also suspect it partly dissolves the plastic which would helop

As you say they recommend Roket which the blurb says was developed "in conjunction with Loctite". I will do some experiments with offcuts before committing!

Has anyone got experience of this model with the dolly for takeoff?

23/04/2020 22:13:32

I think ive decided to go with the OS FP20 initially then move up to the sc25. Many years ago i "tuned up" this 20 engine by drilling out the exhaust tail pipe of the silencer. Since then it doesn't develop enough pressure for a constant fuel feed so rarely got used. Thankfully there was a silencer on ebay for a fiver so thats on order!

Front bulkhead/engine bearers/tank assembly glued into lower fus. This extends right down into the front of the skid to add strength

20200423_124341[1].jpg

Wing seating dry fitted.

20200423_124604[1].jpg

Next to add trailing edge/control surfaces

21/04/2020 22:30:19

I agree Steve, the quality of this kit is very good! The vac formed parts are lovely quality. I can remember Rob Millinship copying an aeromodeller ME163 glider plan in the late 70s as basis for this model! I still have that very plan! Rob is a talented chap and his move to full sized aviation was a big loss to aeromodelling!

This is first kit ive made in over 20 years and being unorthodox in construction, i'm following instructions to the letter. This is good as it forces through those pet hate steps that usually add 6 months to a build! eg control surfaces (dont know why?)

Wing nearly done. Outer elevons have increased reflex. Plan also shows option for single piece elevon but that doesnt look as good

20200421_155524[1].jpg

Fus trimmed to make TE sharp and holes cut out where required to enable wing to be finished off to fit (another step i would procrastinate at for fear of cocking up).

20200421_212106[1].jpg

The fin has a box section below which fits inside main body for strength!

Windy

20/04/2020 22:40:21

Thanks for that. The kit comes with the underpan that forms a dolly. Instructions are on the plan how to build it but I just need to add the axle & wheels. I may try that approach as my own launching arm isnt what it was.

Leaning towards the sc25 with weight saving from the servos, mixer etc. The kit comes with 2 nose cones so i can try various options.

I kept feeling guilty by building a mint in box historical kit but im over that now.

Dave

19/04/2020 21:26:41

During this downtime with the virus, ive decided to make a start on this original kit dating back to 1979. Originally i was going to make molds off the ABS parts but decided that lifes too short!

20200419_192839[1].jpg

The kit is as new except for the browning of the decals

20200419_192929[1].jpg

20200419_193037[1].jpg

20200419_193047[1].jpg

Still trying to decide on what motor to use. I have an sc25 and os20fp. I know Rob Millinship, the original designer of this plane, used a G20-15 super tigre and another hot 15 (KB15 rings a bell?) with no throttle. The SC25 is some 70g heavier than the OS. I want to keep it light but have a throttle.

Will ponder that one and scour ebay for any hot 15 to 20s.

The kit includes a mechanical mixer but i will use mini servos with mixing from the transmitter which will save some weight,

Job one LE and TE on wings.20200419_205051[1].jpg

ttfn

Dave Windy Miller

Thread: North Pacific gliders
12/04/2020 21:39:37

Ditto, i had dozens of these. I used to spend hours trawling the streets for rubber bands the postey would drop to keep them going.

I also had those plastic deltas with razor sharp wings.  I seem to remember they came in blue or yellow?  With a good launch these things were in excess of 100mph i reckon. How we didnt lose eyes i dont know!!!

Most of mine ended up on my parents roof

 

 

Edited By dave windymiller on 12/04/2020 21:44:02

Edited By dave windymiller on 12/04/2020 21:47:51

Thread: If you like engines.........
12/04/2020 21:30:28

Correction, Its "Find it Fix it and Drive it"

09/04/2020 20:24:47

Ive known Allen a few years now being a fellow Kwak triple owner. Talented chap. He pops up a lot on Henry Coles tv shows such as the Motorbike show and Find it fix it flog it

My 1972 H2 750 is usually good for 15-20 mpg but thats comparable to my turbine Hotspot (2 litres per 5 min flight!).    Having said that, lately its up to 3 weeks per gallon!

20180919_181346.jpg

 

Edited By dave windymiller on 09/04/2020 20:26:35

Thread: Covid 19
22/03/2020 14:19:57

Re venice - i was puzzled why the the canals were suddenly clear. Its still an open sewer and the residents no doubt still have excesses of toilet rolls. Lack of churned up mud makes perfect sense!

Personally, im hacked off as my op for a knee replacement early April has gone back to god knows when. Keep calm and limp on. Still good time to clear the model projects out of the garage.

Thread: Insanity seems to be setting in
16/03/2020 21:54:24

Things are getting that bad with shopping mayhem, ASDA opened up a third till today!!!

Thread: Sample Pots
02/03/2020 21:58:21

Those little plastic tubs that popadom pickles come in. Got lids too!

Thread: Hospitalised, my own fault - but ?
11/02/2020 21:41:18

That twin sc52 ripmax rapier was mine and i built a replacement following a flight that finished at -6" altitude!!

I struggle to launch this model these days so i am thinking of a dolly for take off (whilst i still can count to 10). Either that or a vertical takeoff ramp!!

Dave

Ripmax rapier twin launch - youtube

dsc05432.jpg

Edited By dave windymiller on 11/02/2020 21:46:40

Edited By dave windymiller on 11/02/2020 21:47:07

Thread: Super rare Rojair kit - Pre production ME109 with slight fire damage
08/02/2020 16:54:54

20200208_150018.jpg20200208_145957.jpg20200208_150031.jpg

Been distracted with other projects such as the Mig 142 but now back on the ME109 to try and get it finished for this year. Not going to be light as its 1.5kg as it stands (without 5 wing mini servos, battery and finishing) but the thick wing and flaps should help.

Thread: New FPV microcam/FPV cam 31 gms, water resistant
13/01/2020 19:50:40

Does anybody know of a free video converter?

The one i did the utube video will not let me do any more. Other free ones plaster a banner across the screen or dont work at all.

Failing that any suggestions to get .movs to work without stuttering on a PC (with very good video card!!!)

Any suggestions gratefully received

Cheers Dave

02/01/2020 21:34:13

I bought one of these and thus far very happy with the quality. My pc wouldnt play the raw .mov files without stuttering but converting to mp4 worked.

 

Edited By dave windymiller on 02/01/2020 21:35:43

Thread: A new caption competition - winner declared!
27/11/2019 20:25:33

....No! I'll lift the wire and you climb through...

Edited By dave windymiller on 27/11/2019 20:26:10

Thread: Forum members' new models: Let's see them.
03/11/2019 20:14:38

Mig 142 LFI smaller single engine brother of the mig 144 MFI (project flatpack as dubbed by the USA) however this never made it off the drawing board unlike the 144. This 1/12 scale model is 4.5kg and has glass fus and foam/balsa wings and was supposed to be turbine powered but i went for a 65ax initially.

It was a "quick" knock up intended to test the concepts for my big 1/8th mig 144 which will have twin vt80s.(last pic).

Some of the design features found their way to the j10 however!

20191102_215749.jpg

20191102_215916.jpg 20191102_215425.jpg

20191102_215609.jpg

20191102_215628.jpg

Mig 144

Edited By dave windymiller on 03/11/2019 20:19:55

Edited By dave windymiller on 03/11/2019 20:23:45

Thread: Model flying photos you're proud of
30/09/2019 21:19:22

nats 2015 278.jpg

Nats 2015 chuck n duck.  Photo by P Dunkley

Edited By dave windymiller on 30/09/2019 21:20:12

Thread: Simple arduino altimeter
24/05/2019 20:38:54

Here it is, not the best written code im sure but it works!

 

 #include "U8glib.h"
#include "BMP280.h"
#include "Wire.h"
#define P0 1013.25 
BMP280 bmp;

// OLED Type
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NO_ACK);

char sT[20];
char sP[9];
char sA[9];
char sA_MIN[9];
char sA_MAX[9];
char sA_DIFF[9];
char sA_NOW[9];

double A_MIN = 0;
double A_MAX = -1000;
double A_DIFF = 0;
double A_NOW = 0;
double cal = 5.0;
double count = 0;


void draw2( double A_DIFF, double A_NOW) {
  u8g.setFont(u8g_font_unifont);


  dtostrf(A_DIFF, 4, 0, sA_DIFF);
  dtostrf(A_NOW, 4, 0, sA_NOW);
  

  u8g.drawStr( 5, 10, "Alt NOW: " ) ;
  u8g.drawStr( 70, 10, sA_NOW);
  
  u8g.drawStr( 5, 40, "Max" ) ;
  u8g.drawStr( 5, 60, "Alt Ft:" ) ;
  u8g.drawStr( 70, 60, sA_DIFF) ;
}

void setup() {
 
  Serial.begin(9600);
  if (!bmp.begin()) {
    Serial.println("BMP init failed!" ) ;
    while (1);
  }
  else Serial.println("BMP init success!" ) ;

  bmp.setOversampling(4);

  u8g.setColorIndex(1);
  u8g.setFont(u8g_font_unifont);
}


void loop(void) {
  double T, P;
  
  char result = bmp.startMeasurment() ;

  if (result != 0) {
    delay(result);
    result = bmp.getTemperatureAndPressure(T, P);

    P = P + cal;
 
    if (result != 0) {
      double A = bmp.altitude(P, P0);
      A = A * 3.28084;

      if ( A > A_MAX) {
        A_MAX = A;
      }

      if ( count == 0 ) {
        A_MIN = A;
        count = count + 1 ;
        
      }
    A_DIFF = A_MAX - A_MIN;
    A_NOW = A - A_MIN;

      do {
        draw2( A_DIFF, A_NOW);
      } while ( u8g.nextPage() ) ;
      u8g.firstPage();
      delay(500);
      
    }
    else {
      Serial.println("Error. " ) ;
    }
  }
  else {
    Serial.println("Error. " ) ;
  }

  delay(100);

}

Edited By dave windymiller on 24/05/2019 21:01:20

Edited By dave windymiller on 24/05/2019 21:02:12

24/05/2019 20:24:18

With the revision of restrictions around airports changed recently, our club, previously inside the FRZ now thankfully finds its self outside ! In theory we can now fly models greater than 7kg but we need to change the club rule. The limit of 400 ft is the sticking point for the club committee.

I decided to look for a simple altitude recording device and found this simple arduino project  Standalone-Arduino-Altimeter. Only three components & around 10 quid to build.

I decided to build one but decided the software need tweaking to suit. I wanted an altitude above launch. As it stood, it indicated pressure temperature and altitude with altitude min and altitude max. The altitude was dependent on both baro pressure and locality height. It could be possible to calibrate it but this would vary with weather. Also 2 decimal places was too much.

My software simply sets a zero altitude on power up/reset and a maximum in relation to this datum . Ive also set it to feet rather than meters!  The bmp280 chip is apparently good for around +/- 3ft 

20190524_195615.jpg

My device mounted in a small plastic box 50mm X 35mm and weighs less than 20g. The plastic screw is mounted above the arduino reset button to act as a button to reset the altimeter to zero before flight.

If anyones interested i could post my revised software!

 

Edited By dave windymiller on 24/05/2019 20:32:01

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