News:


  • May 26, 2024, 04:36:14 PM

Login with username, password and session length

Author Topic: It flys...  (Read 2038 times)

Offline Bob Reeves

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 3415
    • Somethin'Xtra Inc.
It flys...
« on: January 30, 2011, 06:56:09 AM »
This is the first prototype FJ4 -15 Fury off the line. Put a Brodak 15 on it just to see how it would fly set up for sport and check initial trim. Ended up moving the CG forward about an inch but would probably leave it in the original position when set up for Carrier. The second version (which will be set up for carrier) has the bellcrank mount moved forward and I added 1/2 inch more dihedral so the leadouts would clear the wing without the riser on the leadout guide.

Almost forgot.. Photos by Elwyn Aud..

Offline BillLee

  • AMA Member
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1296
Re: It flys...
« Reply #1 on: January 30, 2011, 08:22:48 AM »
.... The second version (which will be set up for carrier) has the bellcrank mount moved forwar...

Gee, I wonder if you could put the bellcrank on the tail! 


 ;D >:D ::) S?P VD~ ;D
Bill Lee
AMA 20018

Offline Bob Reeves

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 3415
    • Somethin'Xtra Inc.
Re: It flys...
« Reply #2 on: January 30, 2011, 08:41:30 AM »
Gee, I wonder if you could put the bellcrank on the tail! 
 ;D >:D ::) S?P VD~ ;D

Ya I know but everything I read on placing a 3 line bellcrank says to place it aft of the CG. That plus moving the CG forward an inch so the sport version wasn't so sensitive just added to it. I fixed it on the 2nd version and it does prove that it really doesn't matter where the bellcrank is located  y1

Only issue is I should have used cable leadouts instead of solids and if this one ever gets turned into a carrier model it will have cable.

Online bill bischoff

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1707
Re: It flys...
« Reply #3 on: January 30, 2011, 09:02:11 AM »
The reason it is almost universally recommended to put the bellcrank pivot behind the CG on a carrier plane is simply to make the slider work better. When the slider is released, if the CG is ahead of the bellcrank pivot the nose will yaw out from simple physics. This is more reliable and less ugly than springs, rubberbands, etc.

You are absolutely correct that where the bellcrank is mounted is irrelevant except for the above, and leadout issues, and you are also correct that solid leadouts don't belong on carrier planes. It took me a while to figure that one out. I had a carrier Skyray with solid leadouts that was a horrible flying plane at slow speed. I didn't really notice until someone else flew the plane, but the solid leadouts were trying to bend back at the wing tip in slow flight and couldn't.
They were bowed back in a large arc, and since they were all different lengths the control inputs were adversely affected. Any bobble or wobble would start the leadouts "bouncing" and amplify the bobble. Cutting the wing open and installing cable leadouts did the trick, since they were able to flex right at the wingtip.

BTW, very cool planes!

Joe Just

  • Guest
  • Trade Count: (0)
Re: It flys...
« Reply #4 on: January 30, 2011, 09:04:09 AM »
Bob, Please stop sending in pictures of your planes!  It mearly points out to me what a lousy builder/finisher I truly am. there is a great deal of consternation in my shop today while I contemplate burning all my carrier planes because they dont look as good as yours. In fact my best efforts pale in comparison.

See you at the Carrier Circle at Brodak's.  I will be the skinny guy with the fake mustace and glasses.
Joe

The attachment proves my point
« Last Edit: January 30, 2011, 11:10:23 AM by Joe Just »

Offline Bob Reeves

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 3415
    • Somethin'Xtra Inc.
Re: It flys...
« Reply #5 on: January 30, 2011, 09:18:23 AM »
Now Joe don't be so hard on yourself.. You have done allot more to promote carrier than most and believe me the finish on these isn't as good as it looks in the photos. I just happen to have the tools to cut paint masks and have learned to make decals. The bling covers up allot  ;D

Offline wwwarbird

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7987
  • Welcome to the Stunt Hanger.
Re: It flys...
« Reply #6 on: January 30, 2011, 03:49:40 PM »
 Neat plane once again. Looks like a prime kit candidate. y1

 Why do Carrier planes always have pizza cutters for wheels? Is it to help the top speed during the fast laps?
Narrowly averting disaster since 1964! 

Wayne Willey
Albert Lea, MN U.S.A. IC C/L Aircraft Modeler, Ex AMA member


Online bill bischoff

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1707
Re: It flys...
« Reply #8 on: January 30, 2011, 06:44:16 PM »
The pizza cutter wheels are because all the Klett's are gone!

Offline skyshark58

  • skyshark58
  • Trade Count: (0)
  • Captain
  • *****
  • Posts: 401
Re: It flys...
« Reply #9 on: January 30, 2011, 08:02:26 PM »
Yes, less drag and those soft ones get torn up on hard landings. Mike
mike potter

Offline wwwarbird

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7987
  • Welcome to the Stunt Hanger.
Re: It flys...
« Reply #10 on: January 30, 2011, 11:09:01 PM »
 But do they have to be green and red and orange and...? :P :P :P :##  
Narrowly averting disaster since 1964! 

Wayne Willey
Albert Lea, MN U.S.A. IC C/L Aircraft Modeler, Ex AMA member

Offline Bob Reeves

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 3415
    • Somethin'Xtra Inc.
Re: It flys...
« Reply #11 on: January 31, 2011, 02:57:47 AM »
But do they have to be green and red and orange and...? :P :P :P :##  

Lord do I have to explain everything..  :##  :##

Being a prototype things aren't always what we want them to be. The red nose wheel is the result of bending the nose gear a little too long and not being able to use 3 wheels that were the same size. My junk box produced the red one which happened to be slightly smaller and saved me the trouble of bending another nose gear before I could fly it.  ;D

Offline wwwarbird

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7987
  • Welcome to the Stunt Hanger.
Re: It flys...
« Reply #12 on: January 31, 2011, 04:57:12 PM »
 Just teasing. ;D I know the competition types probably don't care, it's all about function.

 I've just always thought those bright colored wheels look really silly, and like here, basically ruin the appearance of an otherwise great looking model.
Narrowly averting disaster since 1964! 

Wayne Willey
Albert Lea, MN U.S.A. IC C/L Aircraft Modeler, Ex AMA member

Offline john e. holliday

  • 24 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 22781
Re: It flys...
« Reply #13 on: February 03, 2011, 08:33:56 AM »
Too bad you were not thre when an individual used clear material for his wheels.  They were also about twice the size of everybodies wheels. :o 

Good to see Bill getting back into the fray.  I think he is starting to have fun.  Maybe I shouldn't relate this but I will.  Bill is sitting there with all the first place awards fo the AMA event along with the Eely Award.  He is sitting there in deep thought when I interrupted him.   He looked at me and stated, "DOC, these awards are great, but I think I had more fun helping the people get their flights in".  No I have not got the MO-1 built for Class II yet.   H^^

And Joe, I think I first met him at the first Tri-Cities NATS.  He is just one big huggy bear.   :)

Now to Bob.  You have done something that stands out.  I like your planes and hope to get to see them fly.  Have missed the Tulsa meet too many times now.   D>K
John E. "DOC" Holliday
10421 West 56th Terrace
Shawnee, KANSAS  66203
AMA 23530  Have fun as I have and I am still breaking a record.

Joe Just

  • Guest
  • Trade Count: (0)
Re: It flys...
« Reply #14 on: February 03, 2011, 08:46:32 AM »
Doc...Huggy Bear? Don't try it, unless your at Brdak's!  Don't forget Doc, I have a video of you fast asleep when you worked with the Carrier team  at Chickapee.

Joe

Offline Douglas Ames

  • 2014 Supporters
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1299
Re: It flys...
« Reply #15 on: February 06, 2011, 12:35:33 PM »
Cool looking little Jets. I think some dihedral with a swept wing is a good idea, especially during the low speed routine. It should give an additional measure of stability. Your graphics are awesome as usual, Bob.
AMA 656546

If you do a little bit every day it will get done, or you can do it tomorrow.

Offline mike hartung

  • aeronut
  • Trade Count: (0)
  • Lieutenant
  • ***
  • Posts: 106
Re: It flys...
« Reply #16 on: February 06, 2011, 02:58:16 PM »
Great looking aircraft, hope to see them at Brodak's. H^^
blue skys and tail winds to all.

Offline Balsa Butcher

  • 24 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 2357
  • High Desert Flier
Re: It flys...
« Reply #17 on: February 07, 2011, 11:23:27 AM »
I like the red nose wheel. You could always nick name the plane "Rudolph".  ~>
Pete Cunha
Sacramento CA.
AMA 57499


Advertise Here
Tags:
 


Advertise Here