Go Back  RCU Forums > RC Airplanes > "1/2 A" & "1/8 A" airplanes
Reload this Page >

Td 049 pusher boomerang ...!!!

Notices
"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

Td 049 pusher boomerang ...!!!

Old 01-03-2021, 09:52 PM
  #26  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

Originally Posted by aspeed View Post
The guys in my old club in Waterloo Ontario still fly the Strykers for a pylon/combat race. They use the 1/2"? pink foam traced from the original and coroplast rudders with electric of course. They have lots of fun with them.
I'll bet they have a quick and easy way to build them.

My first toss of the Boomerang did not go well. It went straight in as if it were very nose heavy and if the elevons were reversed. I think it was massively nose heavy, but will check the thrust angle after the repair is done. I redid the CG calc and found that the CG is just 1/2" ahead of the firewall. This meant the battery needed to move to the rear and that a deeper box needed to be built so the battery could sit right next to the elevon linkage. It was a pretty easy fix



Old 01-03-2021, 11:06 PM
  #27  
Pond Skipper
 
Pond Skipper's Avatar
 
Join Date: Dec 2009
Location: Texas, TX
Posts: 2,794
Received 3 Likes on 3 Posts
Default

Hair up thrust for pushers?
Old 01-04-2021, 12:06 AM
  #28  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

Originally Posted by Pond Skipper View Post
Hair up thrust for pushers?
I think so..more like definitely do not want any DOWN thrust.
I'll take the time to check the thrust closely this time.
I hate the look of this triple decker fuselage..so hopefully I get an idea about gear placement and control set up with the way the plane is now..then transfer this wing to a better looking fuselage design.
The winning design has all the components in single file under the wing.
Old 01-05-2021, 10:49 PM
  #29  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

Here is the check of the engine alignment and it looks close enough to me. I moved the CG back and increased the elevon travel. I think this is the 3rd swept wing pusher I've built with .049 power. The last one I did was pretty fast with a hand carved 4 x 4 prop out of maple.



Last edited by combatpigg; 01-05-2021 at 10:55 PM.
Old 01-06-2021, 06:05 AM
  #30  
aspeed
 
aspeed's Avatar
 
Join Date: Jul 2011
Location: Ruthven, ON, CANADA
Posts: 3,396
Likes: 0
Received 3 Likes on 3 Posts
Default

Deltas always need a bit of up reflex on the elevons. Maybe a framer's square on the bottom of the wing to the motor mount would see if it is up or down thrust.
Old 01-06-2021, 06:44 AM
  #31  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

If you build a delta or flying wing with a light enough wing loading and with a well set CG I've never needed any noticeable "reflex". It's easy enough to prove after you get your Diamond Dust or Screamin' Demon trimmed hands free and then take a look at where neutral trim is.on the elevons.
Do you have a noticeable amount of "UP" dialed into your Screamin' Demon's .trim.?
Old 01-06-2021, 09:13 AM
  #32  
Pond Skipper
 
Pond Skipper's Avatar
 
Join Date: Dec 2009
Location: Texas, TX
Posts: 2,794
Received 3 Likes on 3 Posts
Default

The ole fly and try is in order.
Old 01-07-2021, 06:20 AM
  #33  
049flyer
My Feedback: (18)
 
049flyer's Avatar
 
Join Date: Jul 2002
Location: Prescott, AZ
Posts: 1,082
Received 2 Likes on 2 Posts
Default

The first flight of a hand launched flying wing is always exciting, you never know what it will do. I usually find a hill and try a “test toss” to see if I am close.

I’ve built several of these with great success:



Thunderbird from old magazine plans, powered with a Cox Surestart.
Old 01-07-2021, 02:17 PM
  #34  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

Originally Posted by 049flyer View Post
The first flight of a hand launched flying wing is always exciting, you never know what it will do. I usually find a hill and try a “test toss” to see if I am close.

I’ve built several of these with great success:



Thunderbird from old magazine plans, powered with a Cox Surestart.
That's a great looking Delta..!
Yes....... You never know what might happen on the 1st launch...

In this case one wing panel was heavier than the other and it was the one thing I didn't check.

Last edited by combatpigg; 01-07-2021 at 02:21 PM.
Old 01-07-2021, 10:16 PM
  #35  
049flyer
My Feedback: (18)
 
049flyer's Avatar
 
Join Date: Jul 2002
Location: Prescott, AZ
Posts: 1,082
Received 2 Likes on 2 Posts
Default

I cut the foam cores out of blue insulation foam, covered the blue foam with red tissue applied with watered down white glue, then covered that with doculam to fuel proof it. Worked out very well, a couple of us chased each other around the pylons with these deltas. Lots of fun for vey little money!

1/2A is always a blast!
Old 01-07-2021, 11:16 PM
  #36  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

Originally Posted by Pond Skipper View Post
The ole fly and try is in order.
I was close to trying the plane today but noticed it didn't have the same amount of elevon travel in the UP mode. The elevons themselves dont have any binds but to check the weak servo meant knifing into the plane to investigate. It looked like the servo got a gear tooth missing so I decided to wipe the slate clean and redesign the plane. I found a pair of HS 56s laying around and mounted them recessed as much as possible into the wing. The fuselage will need to be somewhat wider to enclose the portion of both servos that sticks out of the wing.


Old 01-08-2021, 12:33 AM
  #37  
Pond Skipper
 
Pond Skipper's Avatar
 
Join Date: Dec 2009
Location: Texas, TX
Posts: 2,794
Received 3 Likes on 3 Posts
Default

Ah crap but good you caught it before flying again.
Did you ever get the other speeder on vid?
Old 01-08-2021, 08:30 AM
  #38  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

Originally Posted by Pond Skipper View Post
Ah crap but good you caught it before flying again.
Did you ever get the other speeder on vid?
I have flown the new 70 incher at the new club field but the main hwy to the west is so close to where the pilots are supposed to stand that I feel too boxed in right now. The club frowns on speed models because the tendency is to overfly the highway. I need more time to figure out a routine that doesn't have passes aimed at the pit area, nearby houses and definitely not above the main highway.. The old carefree "ballistic pattern" isn't possible at this field. The field also looks south into the sun.
I might still try to find a hay farmer closer to home who would let me use his field.
If it's decent weather I'm ready to get some video today.
Old 01-08-2021, 08:32 AM
  #39  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

Originally Posted by 049flyer View Post
I cut the foam cores out of blue insulation foam, covered the blue foam with red tissue applied with watered down white glue, then covered that with doculam to fuel proof it. Worked out very well, a couple of us chased each other around the pylons with these deltas. Lots of fun for vey little money!

1/2A is always a blast!
So i'm guessing no need for a main spar...?
Old 01-08-2021, 04:39 PM
  #40  
Pond Skipper
 
Pond Skipper's Avatar
 
Join Date: Dec 2009
Location: Texas, TX
Posts: 2,794
Received 3 Likes on 3 Posts
Default

Ahh bummer hope you can snag some vid. Perhaps on a day when the the club is not so busy at the field.
Old 01-10-2021, 09:09 PM
  #41  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

I'm OK with the looks of this one. The first attempt reminded me of those 1800s illustrations of what a steam engine powered flying machine will look like someday.
It ended up wider than I would like...so I think a future attempt will have the elevon servos mounted inline




Old 01-10-2021, 11:57 PM
  #42  
Pond Skipper
 
Pond Skipper's Avatar
 
Join Date: Dec 2009
Location: Texas, TX
Posts: 2,794
Received 3 Likes on 3 Posts
Default

Good save Chuck, the vertical stab will get more work done than the last one.
Nice bird should do well. Overall size/weight will have it zipping ah bouts!
4.75P may straight line faster than the other project.


Old 01-13-2021, 10:43 PM
  #43  
combatpigg
Senior Member
Thread Starter
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 20,016
Received 5 Likes on 5 Posts
Default

At this point it weighs a little more than 8 ozs. I want to flatten the black and then paint some highlights on top just so I don't lose track of which side is up.



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.