Notices
Scratch Building, Aircraft Design, 3D/CAD If you are starting/building a project from scratch or want to discuss design, CAD or even share 3D design images this is the place. Q&A's.

Would this work?

Old 12-04-2010, 09:52 AM
  #1  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default Would this work?

Ok, we all know all them toy foat planes? the ones we throw Gliders. Well my local arts and craft sell giant ones roughly 45cm. It i were to slap a few servos esc and reciver + motor it would fligh right?. I'm not sure if it is strong enough or can carry that much wait but, i can mod it. Sorry if this is in the wroung section.
Old 12-04-2010, 10:31 AM
  #2  
HighPlains
My Feedback: (1)
 
Join Date: Mar 2003
Location: Over da rainbow, KS
Posts: 5,087
Received 4 Likes on 4 Posts
Default RE: Would this work?

A buddy added a throttle equipped .020 Cox engine and three small servos in a foam model about that size over 20 years ago. It did great touch and goes off of a concrete parking lot. You may need to reinforce the wing, but it would be much easier to do today.
Old 12-04-2010, 10:53 AM
  #3  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

ok, I have a spare 380 motor lying around so i could use that ( its cheepest). The only thing in this hobby is how do i make the airons and rudder move. I've sused out the rudder (useing some copper wire conecting it to the servo. Also what would be good to re inforce the wings.
Old 12-04-2010, 01:03 PM
  #4  
BMatthews
 
BMatthews's Avatar
 
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
Posts: 12,425
Likes: 0
Received 22 Likes on 19 Posts
Default RE: Would this work?

It's been done by lots of folks. 

First off though you need to do some more research on cutting away the control surfaces and how to install hinges.  And forget the copper wire for connecting the servos to the surfaces.  In fact your last post suggests that you need to do a lot more Search functions on such things as "how to hinge" and "control installations".  There's been a number of such threads in the past that can guide you on these basics.  After you read a few of them if you still have questions come on back.

I'd also suggest that a brushed 380 can motor is going to be marginal power for one of the 3 foot wingspan foamies.  There are cheap brushless combination packs of motor and ESC available from such places as Hobby King that would produce a far higher chance of success.
Old 12-04-2010, 04:34 PM
  #5  
mikegordon10
 
mikegordon10's Avatar
 
Join Date: Jul 2003
Location: Provo, UT
Posts: 988
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

As far as the wing, it's been done by applying strapping tape from tip to tip on both sides of the wing.
Old 12-04-2010, 09:11 PM
  #6  
Lnewqban
 
Lnewqban's Avatar
 
Join Date: Apr 2007
Location: South Florida
Posts: 4,057
Received 0 Likes on 0 Posts
Default RE: Would this work?

SC,

Check the WALLY WORKS in this site:

http://www.acesim.com/rc/index.html
Old 12-05-2010, 02:40 AM
  #7  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

Ok, I've come up with a design for the wing. Its still in testing but Its a better idea. Also i know when makeing this it dosent matter how manny attemps it takes to get rite. The planes are 50p or 35cents






Old 12-05-2010, 02:55 AM
  #8  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

Here is a diagram of how i would do the ailerons.



Uploaded with ImageShack.us
Old 12-05-2010, 05:53 AM
  #9  
Lnewqban
 
Lnewqban's Avatar
 
Join Date: Apr 2007
Location: South Florida
Posts: 4,057
Received 0 Likes on 0 Posts
Default RE: Would this work?

This is a proven solution for light and simple hinges:

http://solutions.3m.com/wps/portal/3...beTRGGC52N4Mgl
Old 12-05-2010, 08:59 AM
  #10  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

What tape??? That seems easy...
Old 12-05-2010, 09:26 AM
  #11  
Lnewqban
 
Lnewqban's Avatar
 
Join Date: Apr 2007
Location: South Florida
Posts: 4,057
Received 0 Likes on 0 Posts
Default RE: Would this work?

http://www.rcuniverse.com/forum/m_77...tm.htm#7745738
Old 12-05-2010, 09:33 AM
  #12  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?


Thanks for that. I'll see if my local arts and craft shop dose it. Otherwise i'll ship it to the uk!

Old 12-05-2010, 09:36 AM
  #13  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

Ok, after reading it more Its how i could attach the alierons to the wings. Thanks So should i still use the cable way of attaching it to the servo?
Old 12-05-2010, 09:49 AM
  #14  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

just got one and mesured it and the wingspan is 18".I could easly fit a motor on it by cutting into the front. Also I'll glue the wing in place. And tape over the wing. I will then install the servos and stufff...
Old 12-05-2010, 10:12 AM
  #15  
Lnewqban
 
Lnewqban's Avatar
 
Join Date: Apr 2007
Location: South Florida
Posts: 4,057
Received 0 Likes on 0 Posts
Default RE: Would this work?


ORIGINAL: 1/16 Scale Cat

So should i still use the cable way of attaching it to the servo?
That is called pull-pull control; and yes, you can use it for ailerons, elevator and/or rudder.

This i sgood reading about the available options for controling surfaces with servos:

http://www.airfieldmodels.com/inform...ware/index.htm
Old 12-05-2010, 11:16 AM
  #16  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

Wow man. You are probally the most helpful man on here.

If only there were more people like you. And am i right in saying the real piperJ cub used a pull-pull???? And so did the write brothers?
Old 12-05-2010, 11:45 AM
  #17  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

A few things. How do i apply it? do i do a X shape on both sides or what?

Old 12-05-2010, 12:49 PM
  #18  
Lnewqban
 
Lnewqban's Avatar
 
Join Date: Apr 2007
Location: South Florida
Posts: 4,057
Received 0 Likes on 0 Posts
Default RE: Would this work?

Place pieces of tape on each side (the full length of the hinge may add too much weight), making sure the hinge will be free in both direction.

Check this sequence:

http://wmparkflyers.com/Howtobuildafoamy.aspx
Attached Thumbnails Click image for larger version

Name:	Zx70107.jpg
Views:	9
Size:	28.6 KB
ID:	1530614  
Old 12-05-2010, 12:54 PM
  #19  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

Thanks, I'll sort it out once i've brought everything.Anyway i'm really tired so night. Its 9 pm here in the uk!!!
Old 12-05-2010, 01:05 PM
  #20  
Lnewqban
 
Lnewqban's Avatar
 
Join Date: Apr 2007
Location: South Florida
Posts: 4,057
Received 0 Likes on 0 Posts
Default RE: Would this work?

You are welcome.

It is 4:00 pm here in Florida.

Good night.
Old 12-05-2010, 07:34 PM
  #21  
BMatthews
 
BMatthews's Avatar
 
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
Posts: 12,425
Likes: 0
Received 22 Likes on 19 Posts
Default RE: Would this work?

Scale Cat, did I read that right that the model you want to convert is only 18 inch wingspan?  If so I'd suggest you stop right now and go find the bigger foam gliders that are up around 3 foot span.  To keep a small model like an 18 inch span one down to an acceptable weight requires highly specialized and not cheap super micro equipment.  Even a lot of the now fairly common micro gear would be too big and heavy for such a small model. 

Doubling the model to 3 feet may not seem like a big change but it quadruples the wing area and at the same time the "scale effect", sometimes given the term Reynolds number, gets far more favourable with the increase in size.  So the bigger model can carry far more than the doubling of the size would suggest.  And even more than the quadrupling of the wing area would suggest.

Don't be afraid to use Lnewqban's information about the tape hinges for full span application.  It's not going to come out too heavy at all. 

While pull-pull systems do work well they often come with some funky geometry problems that if you don't watch the ratios of the setups can result in slack or overly tight cables that cause trouble.  For your first few models I'd suggest sticking with wire pushrods and single sided control horns.  It's far more simple to set up and avoids some fussy adjsuting of angles and stuff that pull-pull can result in requireing.
Old 12-06-2010, 08:35 AM
  #22  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

Hey, I can't seem to find any 3 foot gliders anywhere can you surest where to find them? google dosent find anything :'( Also how dose the push rod system work??? And where do i get the rods and stuff?
Old 12-06-2010, 09:30 AM
  #23  
Lnewqban
 
Lnewqban's Avatar
 
Join Date: Apr 2007
Location: South Florida
Posts: 4,057
Received 0 Likes on 0 Posts
Default RE: Would this work?

BMatthews is correct, 18" is too small.

Tower offers at leat two big foam gliders:

http://www3.towerhobbies.com/cgi-bin...&I=LXLFF7&P=RF

(To which one of my previous links refers to: http://www.acesim.com/rc/polly/polly.html)

http://www3.towerhobbies.com/cgi-bin...&I=LXLFF9&P=RF

Old 12-07-2010, 09:30 AM
  #24  
1/16 Scale Cat
Senior Member
Thread Starter
 
1/16 Scale Cat's Avatar
 
Join Date: May 2010
Location: London, UNITED KINGDOM
Posts: 180
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Would this work?

Thanks... I'll see what i can do. I'll probally do this in the new year
Old 12-07-2010, 05:22 PM
  #25  
BMatthews
 
BMatthews's Avatar
 
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
Posts: 12,425
Likes: 0
Received 22 Likes on 19 Posts
Default RE: Would this work?

The big 3 foot toss around foam gliders often can be found in toy stores.

As for pushrods and stuff you'll want to check out a hobby shop.  You need music wire to fit the holes in your servos for starters.  Then you need to get the push from the servo to the surface.  One way is to use the same length of wire the whole way.  But since it is flexible and you can't "push a wet noodle" you would need to use a plastic tube to run the wire in.  The tube is secured with glue at each end.  With it secured that way the forces trying to buckle the wire balance out and what goes in one end comes out the other end.

There's other options as well since running music wire the whole way is often not a good idea.  The options range from plastic tubes in tubes with threaded connectors at each end to traditional folks like me that make my non metal pushrods up from sticks of hard balsa or spruce with wire ends bound to the wood with glue and thread.  Others use carbon fiber arrow shafts with wire ends.  And there's also flexible cables in supporting tubes that just need stiff wire ends added using solder. 

Once you get the push and pull to the control surfaces then you need a Z shaped bend or a quick link to connect to a control horn that is mounted on the control surface.  The control horn is what is used to convert the pushrod travel from back and forth to up and down or side to side on the surface.

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.