Logo
Builders' Plan Gallery  |  Hip Pocket Web Site  |  Contact Forum Admin  |  Contact Global Moderator
September 18, 2019, 03:51:42 PM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with email, password and session length
 
Home Help Search Login Register
Pages: [1]   Go Down
Print
Author Topic: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)  (Read 380 times)
0 Members and 1 Guest are viewing this topic.
marcelop
Platinum Member
******

Kudos: 227
Offline Offline

Uruguay Uruguay

Posts: 1,973


Topic starter
"the essential is invisible to the eye", A.Exuperi



Ignore
« on: August 16, 2019, 08:37:20 PM »

Hello friends, this time, we will be experimenting with the construction of a jet model powered by a rubber turbine.
I wouldn't be publishing this if it wasn't for Don McLellan who encouraged me to publish the photos of this experiment.
Attached files Thumbnail(s):
Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Logged

keep your younger spirit in fly
marcelop
Platinum Member
******

Kudos: 227
Offline Offline

Uruguay Uruguay

Posts: 1,973


Topic starter
"the essential is invisible to the eye", A.Exuperi



Ignore
« Reply #1 on: August 16, 2019, 08:39:21 PM »

First, select a model that was very simple to build, as I did not find the desired plan, I drew my own plan, this aircraft is the IA-63 Pampa, jet trainer of the Argentine Air Force.
Also draw the plan for use in the "Formula Argentina" category, which is a category somewhat like the Bostonians.
The turbine was built with a light balsa, and the first running test was carried out, in the days that follow we will build the fuselage to mount it together with the turbine
Attached files Thumbnail(s):
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Logged

keep your younger spirit in fly
marcelop
Platinum Member
******

Kudos: 227
Offline Offline

Uruguay Uruguay

Posts: 1,973


Topic starter
"the essential is invisible to the eye", A.Exuperi



Ignore
« Reply #2 on: August 16, 2019, 08:40:46 PM »

https://www.youtube.com/watch?v=QVN3eBCvzvc
Attached files Thumbnail(s):
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Logged

keep your younger spirit in fly
MKelly
Gold Member
*****

Kudos: 85
Online Online

United States United States

Posts: 858




Ignore
« Reply #3 on: August 17, 2019, 08:36:38 AM »

Neat project Marcelo - I'm looking forward to following your progress.

Mike
Logged
faif2d
Platinum Member
******

Kudos: 31
Offline Offline

United States United States

Posts: 1,190


Sun came up I was here to see it = good day



Ignore
« Reply #4 on: August 17, 2019, 08:55:51 AM »

Wow that is ambitious!  I think this is the first time I have seen two impellers which sure makes sense based on the necessary small diameter of the impellers.  You go my friend!
Logged

I used to like painting with dope but now I can't remember why!    Steve Fauble
Don McLellan
Titanium Member
*******

Kudos: 63
Offline Offline

Canada Canada

Posts: 2,371




Ignore
« Reply #5 on: August 17, 2019, 12:55:59 PM »

Very nice work Marcello!  Looking forward to more pics and reports as you progress.
Logged
marcelop
Platinum Member
******

Kudos: 227
Offline Offline

Uruguay Uruguay

Posts: 1,973


Topic starter
"the essential is invisible to the eye", A.Exuperi



Ignore
« Reply #6 on: August 17, 2019, 08:21:52 PM »

thank you guy s !!!!!
slowly more little progress hope tomorrow start assembling the fuselage!
we testing the fans with 1/4 rubber Fai TAn II (first we use 1mm sq.rubber) a crasy amount of revolutions!!! sauvage!!! hope it fly !!!
Attached files Thumbnail(s):
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Logged

keep your younger spirit in fly
OZPAF
Palladium Member
********

Kudos: 180
Offline Offline

Australia Australia

Posts: 5,111



Ignore
« Reply #7 on: August 17, 2019, 09:09:40 PM »

Rubber powered ducted fans must be one of the hardest modelling challenges. I'll be following with interest.

John
Logged
Crabby
Titanium Member
*******

Kudos: 132
Offline Offline

United States United States

Posts: 2,145


I never met a modeler I didn't like



Ignore
« Reply #8 on: August 17, 2019, 09:33:40 PM »

HI Marcello. Why are you using two fans? Do they fight each other? Is the front one robbing the rear one of air? and how are you making the connections to the shaft?  Very pretty little jet! I can't wait to see the flights! Can you increase the motor run? Thanks for letting us in on the build!
Logged

The Threadkiller!
faif2d
Platinum Member
******

Kudos: 31
Offline Offline

United States United States

Posts: 1,190


Sun came up I was here to see it = good day



Ignore
« Reply #9 on: August 18, 2019, 09:11:06 AM »

Crabby, think of a real turbine and all the fans that they have.  It is really the same problem, as the dia of the blades goes down you need more of them.  The same reason the Corsair had the cranked wing too much horsepower for the prop size.
Logged

I used to like painting with dope but now I can't remember why!    Steve Fauble
Crabby
Titanium Member
*******

Kudos: 132
Offline Offline

United States United States

Posts: 2,145


I never met a modeler I didn't like



Ignore
« Reply #10 on: August 18, 2019, 09:39:06 AM »

Yeah,, I have a million questions. I just wonder at what point do the returns begin to diminish. (especially with rubber power turbines) I will just shut up and watch Marcello do his thing! It's not my intention to challenge the builder here. I have thought about doing rubber turbines in the past, and am stuck on a few things.

Logged

The Threadkiller!
kittyfritters
Gold Member
*****

Kudos: 19
Offline Offline

United States United States

Posts: 497


WWW

Ignore
« Reply #11 on: August 19, 2019, 02:23:45 PM »

I drew  up a 1:12 scale Yak-23 for rubber power several years ago.  The rubber band runs down the length of the boom with a tiny cog belt driving the fan in the pod.  Haven't built it yet.  Watching this one with much interest.

The Corsair had the cranked wing to make the landing gear a reasonable length with the immense prop the designers specified to absorb all the horsepower.

KF
Attached files Thumbnail(s):
Re: Experiment: IA-63 Pampa rubber powered jet (category: Formula Argentina)
Logged

Qua sublata omnia praecepta legis
strat-o
Gold Member
*****

Kudos: 7
Offline Offline

United States United States

Posts: 380



Ignore
« Reply #12 on: August 19, 2019, 03:37:54 PM »

Hi Marcelo, this is a neat project.  If, in your testing, you discover that the fan is not generating as much thrust as you want.  Do not despair.  There is a trick that you can do:  Add stators.  Stators are stationary vanes.  You can see what they look like if you look it up in wikipedia under Axial Compressor and search for the word "stator".  The stators don't have to be fancy, they are just fan blades that do not move.  They simply stop the air from whirling around.  Your design has stators right now, sort of, but they may need to be bigger.

Marlin
Logged
kittyfritters
Gold Member
*****

Kudos: 19
Offline Offline

United States United States

Posts: 497


WWW

Ignore
« Reply #13 on: August 19, 2019, 09:17:14 PM »

Another point is that to get maximum thrust the fans need to be in a tight duct with minimum blade to wall clearance.  Until you get the fans in the duct you will not be able to measure the thrust.  This model looks quite small.   How large is it?

KF
Logged

Qua sublata omnia praecepta legis
Kemper Brown
Bronze Member
***

Kudos: 0
Offline Offline

United States United States

Posts: 11



Ignore
« Reply #14 on: September 04, 2019, 08:56:10 PM »

I look forward to how it works! I’ve only seen a plane with a clear prop pretending to be a jet. Very cool!
Logged
Pages: [1]   Go Up
Print
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!