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Author Topic: RDF in Pistachio Scale  (Read 12336 times)
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Dalat
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« Reply #50 on: April 08, 2018, 10:46:00 AM »

Halo All

Die Fly performances of the MiG17 with front DF Location (under the Cockpit) ist not satisfying. The Motor thrush is just enough to cruise. I will Change this to a post Location like the F104G or Skystreak semi-scale.
Now i just begin to build a Pistachio scale of a Mirage III S - Swiss AF.
It seem to be promising with 3.2 g all included and nearly 2 dm2 Wing surface.
Just watch the Fotos of this low weight model.
The fly test will be done after my Holidays.

Yours

Dalat
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strat-o
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« Reply #51 on: April 08, 2018, 08:57:08 PM »

Very inspiring.  I have Depron in 1/16" and 1/32 thicknesses.  In the past the 1/16" was very easy to roll but the 1/32" always creased instead of rolled.  It hadn't occurred to me until now that maybe I just needed to lightly sand off the outer skin as that might allow it to take the curve better. 

Marlin
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Dalat
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« Reply #52 on: April 09, 2018, 06:37:41 PM »

I use     swissporXPS 300 GE      heat sliced to about 1/40 "" thickness (about 0.6 and 0.7 mm)  A4 Sheet to be printed with ink Jet printer .
I can roll this material until a good 1/6"" Diameter tube, by preformed (roll) this sheet firmly sandwiched between a dowel and papersheet. Perhaps this will works with duromatic.
The dowel diam. may be 1/3 of the wished tube diam.

Dalat
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Dalat
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« Reply #53 on: September 08, 2018, 05:53:16 PM »

Hi All

The MiG 17 refuses to climb because of his Front Ducted fan... I began to start a classic Push configuration with a Mirage 3 of Swiss AF...with the same RDF of 25mm or 1 Inch RDF as with the F104G Starfighter...now this Project ist realised und this Mirage 3 flights well in Gym, a Video will come but right now i made some screenshoot of his first flight indoor: nearly 14 secs in 2 ascending circles.

Dalat
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Andyjbj
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« Reply #54 on: September 09, 2018, 12:10:31 AM »

Really nice work. I love how you made the the DF unit slip-in, not fixed inside the fuselage. I guess it is keyed to prevent rotating?


Sent from my iPhone using Tapatalk
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Dalat
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« Reply #55 on: September 09, 2018, 05:53:27 AM »

Hi Andy ?

The DF unit is configurated to use like a Propeller unit in Rubber FF, standardised as a module to be interchangeable for differents
(Jet)models...One unit for many models or one model for many unit...So many conbinations may be possible to find the optimal
DF unit or airplane cells config.
The axe of this DF unit has 2 endings/devices to prevent fan rotating: 1.- Rubber retaining hook     2.-prolongated part to be firmly hold to stop a winded Motor.
A Long pin traversed the hook and retains the rubber to get winded during the winding process , at the other rubber's end ist simply a device bounded to a winder.
Once the rubber get winded. The winder disengages, the model too...Nothing rotates. The motor gets stopped 2 times.
Now Begins the funny part: (1)One Hand retains the prolongated DF axe part, and (2) the other Hand takes the pin away. the Motor ist now stopped by (1) until the Launch of the whole model...Zero winded turns would be wasted until Launch...Similar to start a Propeller FF rubber model.
To practice this process ist much simpler for me than to describe it...I hope that you understand somehow my very dusted englisch.

Dalat   
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rgroener
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« Reply #56 on: September 10, 2018, 12:12:53 AM »

Dalat, very nice to see it finished and flying.
I hope to see it at the fall meeting in October...
Do you plan to be there? It would be nice to see you and Peter again.

Good luck with the trimming!

Roman
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Dalat
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« Reply #57 on: September 10, 2018, 05:44:41 AM »

Hallo Roman

What a surprise to read from you  Shocked
Peter and i will be at the fall meeting in October to see all of you aggain.
The Mirage III will mahe a short Show to you all, hopefully in mild outdoor weather condition.
We have already a Video of his maiden fligh, now i still have to illustrate this a bit.
The trimming get finished. Now, it remains the only question: how many turns we can load...
this device konsumes and wastes many energy, 250 revs per SECOND !  till now i get 3200 t in it,
with a Fresh/new FAI TAN, i hope to pack 4500 t  in this 60cmm/24 inches Loop. monstruos!
a normal Prop Pistachio model, in the same condition, konsumes 20 times less.. just to give an idea
with RDF...I am glad that It works but wastes so many energies.

Nice to See you again

Thanh
 
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Dalat
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« Reply #58 on: September 10, 2018, 04:31:06 PM »

2 more screenshoots

Dalat
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flydean1
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« Reply #59 on: September 10, 2018, 10:40:03 PM »

Dalat,

I remain greatly amazed at your achievements.
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rgroener
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« Reply #60 on: September 11, 2018, 12:43:50 AM »

Dalat, good news to see you and Peter at the fall meeting. I am organizing the nice calm weather and you will bring your cool jets Grin

Roman
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Dalat
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« Reply #61 on: September 11, 2018, 09:15:33 AM »

Thank you Roman for booking some calm weather. So we won't use my Laptop just to watch the Mirage RDF Videos.
I wonder how The judges in Nijmengen would  give statik Points to this Jet-RDF-Pistachio ( Spanning less than 8 inches or 203mm) Roll Eyes  Grin 

Dalat
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Ray_K
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« Reply #62 on: September 11, 2018, 05:46:09 PM »

9-11-2018

I am very amazed at what you have accomplished with these jets, any chance of us seeing plans and instructions on how we could make one?

Cheers, Ray K.
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Dalat
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« Reply #63 on: September 11, 2018, 06:03:28 PM »

Hallo Ray K.

please just get a look in

http://www.hippocketaeronautics.com/hpa_plans/categories.php?cat_id=37&sessionid=8f53843b6fa7644ee87886e88da4210f

and  sort Images by   Downloads     Option Descending      and strke   Go

You may see 3 or 4 colored Previews of  a simplified answer to your question refer for expl.to this F104G Starfighter.
The Plans or Cutout of the Mirage III may come later in this links...Right now it is not detailed.

Dalat
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Dalat
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« Reply #64 on: September 11, 2018, 06:38:27 PM »

Hallo Ray K.

The plans of this Mirage III, will come later. Right now for me it seems not to be enough detailed for Users/Others Model builder.
The short fly of this F104G, as seen on Video in this site was done with only packed 1700 Turns...With 3200 Turns it would fly as well as this Mirage III.  Now i know a Little more on the Performances of These RDF, the more turns they get the better they will fly ( Higher & longer), and consume 250 revs/turns pro SECOND. They fly all well wenn accodingly trimmed, except the MiG 17 with Front ducted fan config... The max number of turns lays between   3600-5400 turns, depending on the Rubber Loop's lenght 16- 24 inches.
They all are FAI TAN  5/99 cut to 0.71 gram/Meter...   Just a reference till now



Sorry many Videos of These RDF  F104G, Mi-scale Skystreak  etc.. lay NOT in this site but in the following:

https://www.rcgroups.com/forums/showthread.php?919440-rubber-powered-ducted-fan-what-the-story-with-this/page7


Dalat
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OZPAF
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« Reply #65 on: September 11, 2018, 08:23:34 PM »

Inspiring work Dalat. I admire your dedication and craftsmanship. How do you make your impellers? 250revs/sec?

Happy flying.

John
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Dalat
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« Reply #66 on: September 11, 2018, 10:05:28 PM »

hallo John

This is another Story, i will draw a tutorial sequence of it in the future.
Summary the impellers 4 pales are cut from  the thinnest ( half as thin as a photocopie paper) White Plastik yogurth can, to be insert in a Balsa dowel of 1/4 inches diam...A  drawing will explain the whole process better...etc...Please be Patient.
250 revs/secs from a 22mm dia. rotor don't need robust material. Why do i estimate this 250 revs/secs ? By watching the  in fly Video and the Moment that the DF quiets v/s the total winded turns( yes RDF is noisy, and this thin rubberband 0.7 g/m can drive it to this speed  !). Static observations would give wrong records.

Dalat
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OZPAF
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« Reply #67 on: September 13, 2018, 08:59:09 PM »

Thanks for that Dalat - it's very interesting.

John
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Dalat
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« Reply #68 on: September 16, 2018, 03:13:43 PM »

Hallo to RDF's friends

Now are the maiden flight Videos of the Planes uploaded in Youtube.
   
  Mirage III s with decend short Inauguration flight :

  https://www.youtube.com/watch?v=5exSO94cUoM
     
   and  MiG17 with underpowered first fly :

   https://www.youtube.com/watch?v=I_gPSz3Ayi8


Regards

Dalat
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OZPAF
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« Reply #69 on: September 16, 2018, 08:26:48 PM »

Thanks for that Dalat. Both jets appear very stable in flight.

John
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Ray_K
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« Reply #70 on: September 18, 2018, 06:58:21 PM »

9-18-2018

Dalat, Really amazing models, I have got to try one. Many thanks!

Cheers, Ray K.
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Dalat
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« Reply #71 on: September 25, 2018, 07:38:18 PM »

Please do it

Keep it light very light and pack enough energy in his rubber and have fun. I will share what i've learned whenever you would need it.

Dalat
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