RC India
Welcome Guest, please login or register.
 
Pages: [1]   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« on: November 24, 2014, 04:21:42 PM »
sbajare
sandy
Plane Lover
Forum Hero

*****

Reputation Power: 20 
sbajare barely matters.sbajare barely matters.
Offline Offline

City: Pune
State: Maharashtra
RC Skills: Advanced
Posts: 1296
Join Date: Jun, 2009

Human mind is like a parachute, works when open




hi,

built a catapult launcher for skywalker x8 using locally available materials.
boom is 8ft x 50mm sq. aluminium, ball bearings and aluminium strips.
used heavy duty catapult rubber. total pull is 16 kgs. now increased to 22kgs.

tested on field and result was fantastic.

plan on refining the design and make it better.

pics below

will upload video in short time


IMG_20141115_134351.jpg
Catapult launcher for Skywalker X8
* IMG_20141115_134351.jpg (40.42 KB, 800x450 - viewed 3000 times.)
This post has 3 more images(s)/attachment(s). Please login or register to view them.
Logged

Sandeep Bajare
Ph - 9175342600
sandeepbajare@gmail.com
 

Read
« Reply #1 on: November 24, 2014, 06:59:20 PM »
ashok baijal
Plane Lover
Forum Hero
*****

Reputation Power: 7 
ashok baijal has no influence.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Beginner
Posts: 595
Join Date: Oct, 2009



Great.  Clap

Waiting for video Roll Eyes

What is the source of the catapult rubber?
Logged
 

Read
« Reply #2 on: November 24, 2014, 07:04:42 PM »
sanjayrai55
Plane Lover
Forum Hero

*****

Reputation Power: 85 
sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.
Offline Offline

City: Gurgaon
State: Haryana
RC Skills: Intermediate
Posts: 8337
Join Date: Dec, 2011

Don't wake a Tiger until you've factored the teeth



Nice one Sandeep. Did you use surgical rubber?
Logged

 

Read
« Reply #3 on: November 24, 2014, 08:14:29 PM »
iamahuman
Captain 'no sense of direction'
Forum Administrator
Forum Hero

*****

Reputation Power: 31 
iamahuman is working their way up.iamahuman is working their way up.iamahuman is working their way up.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Intermediate
Posts: 2864
Join Date: Apr, 2010



I'm guessing it's bungee cord?

Logged

"Chuck Norris once overcharged a lipo. Thank him for the Sun."

SSC LCG Slash 4x4.
JQ THE eCar.
 

Read
« Reply #4 on: November 24, 2014, 10:03:01 PM »
sbajare
sandy
Plane Lover
Forum Hero

*****

Reputation Power: 20 
sbajare barely matters.sbajare barely matters.
Offline Offline

City: Pune
State: Maharashtra
RC Skills: Advanced
Posts: 1296
Join Date: Jun, 2009

Human mind is like a parachute, works when open



20mm dia rubber tube used for making catapult. this rubber has fantastic flexibility. costed 120rs for 3ft.

used 2nos but length reduced to maximise pull. trial pull showed 8kg torque. now increased to 11.5kgs as I plan to add 1kg payload.

regds
Logged

Sandeep Bajare
Ph - 9175342600
sandeepbajare@gmail.com
 

Read
« Reply #5 on: November 25, 2014, 01:21:51 PM »
sbajare
sandy
Plane Lover
Forum Hero

*****

Reputation Power: 20 
sbajare barely matters.sbajare barely matters.
Offline Offline

City: Pune
State: Maharashtra
RC Skills: Advanced
Posts: 1296
Join Date: Jun, 2009

Human mind is like a parachute, works when open



hi,

pics below

IMG_20141122_080714.jpg
Re: Catapult launcher for Skywalker X8
* IMG_20141122_080714.jpg (58.76 KB, 800x450 - viewed 4888 times.)
Logged

Sandeep Bajare
Ph - 9175342600
sandeepbajare@gmail.com
 

Read
« Reply #6 on: November 25, 2014, 01:44:44 PM »
allthatido
Plane Lover
Forum Hero

*****

Reputation Power: 11 
allthatido has no influence.
Offline Offline

City: Mumbai
State: Maharashtra
RC Skills: Intermediate
Posts: 910
Join Date: Apr, 2009

Happy is a man whose hobby is his profession



We need a video Sandeep ji..photo doesn't do justice to this creation
Logged

 

Read
« Reply #7 on: November 25, 2014, 02:34:16 PM »
K K Iyer
Global Moderator
Forum Hero
*****

Reputation Power: 61 
K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!
Offline Offline

City: Indore
State: Madhya Pradesh
RC Skills: Intermediate
Posts: 5165
Join Date: Jan, 2012



@sbajare,
That ball bearing idea is fantastic!
As usual you come out with something new every few months. Great.
More photos please.
Not able to see:
- carriage restraint mechanism at full cock
- carriage release mechanism
- method of retaining model on the carriage
- what happens when the carriage hits the forward stop

Regards.
Logged
 

Read
« Reply #8 on: November 25, 2014, 10:26:39 PM »
sbajare
sandy
Plane Lover
Forum Hero

*****

Reputation Power: 20 
sbajare barely matters.sbajare barely matters.
Offline Offline

City: Pune
State: Maharashtra
RC Skills: Advanced
Posts: 1296
Join Date: Jun, 2009

Human mind is like a parachute, works when open



hi,

trying to edit video and upload same.

Iyer sir, will post details with pics. right now busy wit trials.

there is a pin locking the carriage. releasing is simply by pressing lever. 

the cradle hits the front legs but working on damping the hit by using springs or rubber stopper.

regds
Logged

Sandeep Bajare
Ph - 9175342600
sandeepbajare@gmail.com
 

Read
« Reply #9 on: November 26, 2014, 11:53:05 AM »
sbajare
sandy
Plane Lover
Forum Hero

*****

Reputation Power: 20 
sbajare barely matters.sbajare barely matters.
Offline Offline

City: Pune
State: Maharashtra
RC Skills: Advanced
Posts: 1296
Join Date: Jun, 2009

Human mind is like a parachute, works when open





video as per request
Logged

Sandeep Bajare
Ph - 9175342600
sandeepbajare@gmail.com
 

Read
« Reply #10 on: November 26, 2014, 12:39:21 PM »
manojswizera
Plane Lover
Forum Hero

*****

Reputation Power: 18 
manojswizera has no influence.
Offline Offline

City: AURANGABAD
State: Maharashtra
RC Skills: Beginner
Posts: 1336
Join Date: Oct, 2011



Awesome sandeepji.  Hats Off
Logged

Russ-40 Trainer, Mr.moss, Pushler, Skysurfer, Mugi , F-22, Red swan, Xtra-300, redfury, flying mantaray.
 

Read
« Reply #11 on: November 26, 2014, 12:47:55 PM »
K K Iyer
Global Moderator
Forum Hero
*****

Reputation Power: 61 
K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!
Offline Offline

City: Indore
State: Madhya Pradesh
RC Skills: Intermediate
Posts: 5165
Join Date: Jan, 2012



Great job  Clap
Logged
 

Pages: [1]   Go Up
Jump to:  

Related Topics
Subject Started by Replies Views Last post
Skywalker FPV build log
Electric Planes
foamybuilder 19 11770 Last post August 24, 2013, 02:39:14 PM
by Nithinraj Kotian
RC Launcher
Tools, Materials and Building Techniques
anandp 2 3083 Last post December 09, 2012, 01:45:00 PM
by sanjayrai55
Sale - ESC programming card, servo, ESC, Winder, Launcher
For Sale
Adiboy 16 5966 Last post July 04, 2013, 04:31:54 PM
by Adiboy
Saili XTR & G2 launcher
Wanted
yashodhanp 0 1787 Last post January 08, 2014, 01:21:23 PM
by yashodhanp
Catapult gliders needed
Wanted
Antriksh 5 2013 Last post May 20, 2016, 02:22:53 PM
by Voice of deaf