Go Back  RCU Forums > RC Airplanes > Extreme Speed Prop Planes
Reload this Page >

Weston Magnum R build

Notices
Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Weston Magnum R build

Old 03-13-2010, 07:27 PM
  #26  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build


ORIGINAL: mk1spitfire


ORIGINAL: john josey

This next comment may cause some concern from some, but i intend to fit a rudder to the magnum in the near future.

I will be installing the servo and control snake during the build, but i will be leaving the rudder off for the first few flights. I just know i will get bored if i dont add another dimention to it ! I know the airframe was designed for out 'n out speed but as far as i know nobody has done this before and nothing ventured nothing gained sort of thing. The first 'hint' of flutter and i wont hesitate to remove it.

For some reason i`m having trouble uploading the pictures from my phone tonight, i`ll keep trying.
Knife edge at 150, sweet
Yeah that type of thing, it may turn out to be usless but if you dont try you`ll never know. It`s just an attempt to make it a bit more versatile
Old 03-13-2010, 09:36 PM
  #27  
MJD
My Feedback: (1)
 
MJD's Avatar
 
Join Date: May 2003
Location: Orangeville, ON, CANADA
Posts: 8,658
Likes: 0
Received 2 Likes on 2 Posts
Default RE: Weston Magnum R build

Just a thought - since it already has a split elevator, have you considered moving the vertical fin back an inch or so, and extending the rudder down to the bottom of the fuse? You'd be able to link to it from the side of the fuselage that way too, which to me is less messy than a rudder pushrod on top. The rear of the fuse would want some blending.

MJD
Old 03-13-2010, 11:08 PM
  #28  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build


ORIGINAL: MJD

Just a thought - since it already has a split elevator, have you considered moving the vertical fin back an inch or so, and extending the rudder down to the bottom of the fuse? You'd be able to link to it from the side of the fuselage that way too, which to me is less messy than a rudder pushrod on top. The rear of the fuse would want some blending.

MJD
Yeah thats the way i`ve went for The servo and the snake is in place and the snake exits about 20mm up from the bottom of the fusalage. i`m gonna just leave the fusalage the correct width at the rear, although i suppose you could make the rudder a bit wider at that point so it`s not as much of a 'step' in ?

Obviously i`ll keep the gap to a minimum and the linkage will be absolutely slop free, but i still have concerns about flutter. I`m thinking on fitting a longer control horn in an attempt to make it more stable ? Any ideas/suggestions welcolm.

I`ll try again with the pictures.
Old 03-13-2010, 11:42 PM
  #29  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

OK got the pictures working.

This one just shows the position of the throttle and rudder servos.


And this one is just the rudder servo and plywood support for the snake. with the servo at that height, there is a full 2mm clearance from the aileron linkage, even with the wing seat getting compressed when tightened i doubt it will be close to 2mm, but i will check just to make sure.
Old 03-14-2010, 05:26 AM
  #30  
mk1spitfire
Senior Member
 
mk1spitfire's Avatar
 
Join Date: Oct 2007
Location: south, UNITED KINGDOM
Posts: 1,208
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Weston Magnum R build

Dont forget your batttery has got to fit in.

Nice idea with rudder extensions mike.
Old 03-14-2010, 10:10 AM
  #31  
MJD
My Feedback: (1)
 
MJD's Avatar
 
Join Date: May 2003
Location: Orangeville, ON, CANADA
Posts: 8,658
Likes: 0
Received 2 Likes on 2 Posts
Default RE: Weston Magnum R build


ORIGINAL: john josey

Obviously i`ll keep the gap to a minimum and the linkage will be absolutely slop free, but i still have concerns about flutter. I`m thinking on fitting a longer control horn in an attempt to make it more stable ? Any ideas/suggestions welcole.
Maybe fatten the rudder out to blend to the fuse profile/taper then..? That should smooth things out in that area, airflow-wise not to mention visually.

Longer horns and servo arms, i.e. attachment points farther from the center of the circle, do indeed reduce the net slop from any clearances or pushrod flexing. So they are a good precaution, but I don't think you need to go nuts i.e. giant scale horns or anything. 7/8" - 1" maybe. I always try to ensure that I have size-on-size fits of the clevis pins to the horn for that reason, i.e. no clearance I can detect but no binding. I am growing very fond of the Sullivan steel horns with the plastic bushing insert.

Don't forget you're not really doing anything more radical than a rudder on a Q500, although you may be wanting more throw. The point being the application is well within the known realm, so your common sense precautions will likely do the trick fine. It's not a 200+ mph aircraft after all, despite Weston's bold claims. Never heard of a radar track over 165 or so yet. Not that ain't fast, it is indeed. But it's achievable without rocket science.

MJD
Old 03-15-2010, 08:21 PM
  #32  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

Thanks for the positive comments guys. I`m just in from spending most of the day working on the rudder and fitting the aileron servo, and after reading your comments thats pretty much what i`ve done including the 1" horn, spooky or what ?

I fly jets, so i`m no stranger to fast aeroplanes, but this is new territory for me with a prop model.

I`ll post some pictures of the progress so far.

                                                                              cheers
                                                                                     john
Old 03-15-2010, 08:49 PM
  #33  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

I was intending using 1/4" sheet balsa, but i diden`t have any and i couldn`t be bothered with the 30 mile round trip to go and get some. so i decided to use 1/2 sheet that i had lying around, which turned out to be the better choice. covered the fin and fus with masking tape so as not to scratch the covering when trying to sand it to shape.
Old 03-15-2010, 08:59 PM
  #34  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

I made up a couple of thin ply 'tangs' in an attemp to hold the rudder ridged to the fin and fus while i attempted to sand it to shape, which i must say worked suprisingly well.

For some reason i`m only able to add one image per post before it times out on me, it was ok before so maybe it`s something i`ve done.
Old 03-15-2010, 09:05 PM
  #35  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

Begining to take shape, i think it was about an hour to get to this point.
Old 03-15-2010, 09:15 PM
  #36  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

I`m really pleased with the way it`s turned out, although the bottom doesn`t look quite right even though it does follow the contour of the fus.
 
i have decided to cut the bottom to a different angle as shown in the next picture with the blue pen line.
Old 03-15-2010, 09:18 PM
  #37  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

Old 03-15-2010, 10:04 PM
  #38  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

I diden`t like the supplied aileron liteply mount so i made my own from 3mm birch ply and resessed them to drop the servo, and give an extra bit of clearance with the rudder servo (it diden`t really need it) just another precaution.
Old 03-15-2010, 10:13 PM
  #39  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

Aileron servo in it`s final resting place. I decided to balsaloc the covering that i had cut away to insert the plywood mounts and iron it back in place just to tidy things up.
Old 03-15-2010, 10:26 PM
  #40  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

And the final one for today. All hooked up ready to go. At the moment the ATV`s are at 85% to get the recommended 8mm travel, so i might raise the connectors on the threaded part of the torque rods to get the ATV`s closer to 100%. although a slight loss in resolution is the least of my worries i would think (wheres the scared smiley)

I`m gonna have to go to the model shop tomorro to see if i can get covering for the rudder to match the rest of the model.
Old 03-16-2010, 03:55 AM
  #41  
mk1spitfire
Senior Member
 
mk1spitfire's Avatar
 
Join Date: Oct 2007
Location: south, UNITED KINGDOM
Posts: 1,208
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Weston Magnum R build

looking good,you guna use c/a hinges to put rudder in?
Old 03-16-2010, 04:03 PM
  #42  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build


ORIGINAL: mk1spitfire

looking good,you guna use c/a hinges to put rudder in?
I`d like to use the CA hinges for the convenience and peace of mind that they give, but the second i 'shoved' those pieces of ply into the fin and rudder the CA ones were not an option anymore, well not in those positions.

After giving it a bit of thought i decided to have two of each, maybe overkill, but not worth taking any chances with. I`ll post a few more pics shortly.

john
Old 03-16-2010, 07:45 PM
  #43  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

Unconventional layout of hinges, but it was the only real feasable option.
Old 03-16-2010, 07:58 PM
  #44  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

Managed to pick up some iron on film that is a pretty close match colour wise, which was lucky.

As a last resort i had a can of Tamiya spray paint which i know is a almost perfect colour match (TS 47 chrome yellow) but it would have meant glassing the rudder and then having to fuel proof it ! and i just couldn`t be bothered truth be told.
Old 03-16-2010, 08:05 PM
  #45  
smoknrv4
My Feedback: (11)
 
smoknrv4's Avatar
 
Join Date: Dec 2003
Location: RR#7 Aylmer, ON, CANADA
Posts: 1,291
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Weston Magnum R build

Looks awesome! Nice job, keep it up John.
Old 03-16-2010, 08:09 PM
  #46  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build

I was a bit concerned that it might look out of place hanging off the back of the fin, but i have to say i think it blends in quite well. The fin /rudder kind of reminds me of the 1980`s Hanno prettner supra fly type of thing ?
Old 03-16-2010, 08:24 PM
  #47  
smoknrv4
My Feedback: (11)
 
smoknrv4's Avatar
 
Join Date: Dec 2003
Location: RR#7 Aylmer, ON, CANADA
Posts: 1,291
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Weston Magnum R build

Looks like its was meant to have a rudder.
Old 03-16-2010, 08:35 PM
  #48  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build


ORIGINAL: smoknrv4

Looks awesome! Nice job, keep it up John.
Thanks for the kind words. This is my first ARTF and my first online build/ assembly attempt and i wasen`t sure how to go about it. Quite often you`ll read a build thread and only get half the story, on the other hand if you go into to much detail then most people will lose interest i think.

Again thanks for the kind words, sametoo the others that have given sound advice and positive comments, especially MJD for taking the time to explain his advice in detail, it really is appreciated.

cheers
john
Old 03-16-2010, 09:19 PM
  #49  
Mike06659
 
Mike06659's Avatar
 
Join Date: Jun 2006
Location: Mercersburg, PA
Posts: 773
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Weston Magnum R build

I bet an electric conversion in this airframe would put it in the 200 mph range. Food for thought
Old 03-16-2010, 09:25 PM
  #50  
john josey
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 978
Likes: 0
Received 1 Like on 1 Post
Default RE: Weston Magnum R build


ORIGINAL: Mike06659

I bet an electric conversion in this airframe would put it in the 200 mph range. Food for thought
Electric is something i haden`t even considered, although you may well be right.

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.