Go Back  RCU Forums > RC Airplanes > RC Jets
Reload this Page >

VIXEN - virtual build thread

Notices
RC Jets Discuss RC jets in this forum plus rc turbines and ducted fan power systems

VIXEN - virtual build thread

Old 07-01-2015, 06:16 AM
  #1  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default VIXEN - virtual build thread

The VIXEN is a new sports jet, a collaboration between myself and Xtreme ARF, its a sharp looking modern sports jet manufactured using the latest composite technology.

The VIXEN has been test flown in the USA before a final 'production' spec model was built, this is the first of these and incorporates all the changes and feedback given by the pilot, builder and myself.

The specs are:

Length 2667mm (105")
Span 2388 (94")
AUW expected 18-20kg
Turbine 180+

The original thread is found here http://www.rcuniverse.com/forum/rc-j...ming-soon.html

Two videos of the test flying are here https://www.youtube.com/watch?v=xl7caO1uMMc

Some key features of the VIXEN are:

Split fuselage aft of wings to make a compact transportation format.
Removable fin, one piece stab and wings
Notched wing leading edge
Swept wing tips
Hard points in wings for ordinance/drop tanks
Trailing ling landing gear
Fitted wheel wells
Belly mounted dive brake
Painted outside of the mould to customer specified colour scheme

It's been a long while since a did a build thread on RCU so I'm going to be rusty, the VIXEN is being built as my demo kit and I hope to build and have it test flown here in the UK in time to fly it at Jetpower in September. I'm happy that a friend and top notch pilot will be flying the Vixen - 'Azza' Aaron Stephens.

The VIXEN is in final paint prep currently so I won't have the kit until late next week (hopefully) but wanted to start the post with a hardware choice.

Today the turbine arrived, it's the new Jet Italia Atom 250, a very compact and light turbine which delivers a big punch in the 'newton' field, my friend Francesco has worked hard to build and ship me this turbine so that I can test and fit this gem of engineering into the VIXEN.
I chose the Atom 250 as it looked to provide exactly what I wanted in a lightweight and compact package.

Attached are some pictures of the Atom 250 and look forward to the results it delivers when the build is complete. More to follow.



marcs
Attached Thumbnails Click image for larger version

Name:	DSC_1946.JPG
Views:	449
Size:	3.15 MB
ID:	2106749   Click image for larger version

Name:	DSC_1947.JPG
Views:	429
Size:	2.79 MB
ID:	2106750   Click image for larger version

Name:	DSC_1948.JPG
Views:	435
Size:	3.25 MB
ID:	2106751  
Old 07-01-2015, 06:20 AM
  #2  
RCISFUN
My Feedback: (44)
 
RCISFUN's Avatar
 
Join Date: Apr 2002
Location: Erie, PA
Posts: 6,437
Likes: 0
Received 1 Like on 1 Post
Default

Don't worry Marc, I will help keep your build thread on the straight and narrow...
Old 07-07-2015, 07:41 AM
  #3  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

The Vixen is now in final paint prep and should be packed and shipped later this week, whilst this is going on I have received a set of custom made Electron Retracts to test and ultimately offer as an 'electric' option for the Vixen kit.

Big thanks to Xoel for working with me on this and machining special legs and parts for the retract units to get them to the right configuration.

There will be an amount of 'adapting' mainly on the gear rails to hopefully get these to fit so the final results wont be known until I have the airframe with me.

I've never been a great fan of air, electric tick more boxes for me and having had very good experiences with Electron on past models the choice was a simple one for me and I'm glad Xoel has agreed to work with me on this.

Quality is really top notch, the feel gives you confidence in the durability and robustness and all the machining is beautifully finished. In addition I have the R200 controller and programming pad to set things up and the mains are running the Electron electric brakes.

A few pics of the gear supplied for testing....



marcs
Attached Thumbnails Click image for larger version

Name:	DSC_1965.JPG
Views:	407
Size:	2.77 MB
ID:	2107939   Click image for larger version

Name:	DSC_1966.JPG
Views:	359
Size:	2.83 MB
ID:	2107940   Click image for larger version

Name:	DSC_1971.JPG
Views:	343
Size:	3.20 MB
ID:	2107942   Click image for larger version

Name:	DSC_1972.JPG
Views:	328
Size:	2.74 MB
ID:	2107943   Click image for larger version

Name:	DSC_1973.JPG
Views:	317
Size:	2.75 MB
ID:	2107944   Click image for larger version

Name:	DSC_1974.JPG
Views:	360
Size:	3.08 MB
ID:	2107945  
Old 07-14-2015, 09:36 AM
  #4  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

The demo kit is painted and on it's way to the UK, really hope it arrives safe and sound....

As soon as it lands I will start the build and keep you all updated.



marcs
Attached Thumbnails Click image for larger version

Name:	IMG_5631.JPG
Views:	438
Size:	2.24 MB
ID:	2109150   Click image for larger version

Name:	IMG_5633.JPG
Views:	375
Size:	2.29 MB
ID:	2109151   Click image for larger version

Name:	IMG_5616.JPG
Views:	352
Size:	2.58 MB
ID:	2109152   Click image for larger version

Name:	IMG_5621.JPG
Views:	383
Size:	2.57 MB
ID:	2109153   Click image for larger version

Name:	IMG_5626.JPG
Views:	320
Size:	2.40 MB
ID:	2109154  
Old 07-14-2015, 09:40 AM
  #5  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

One more...


marcs
Attached Thumbnails Click image for larger version

Name:	IMG_5625.JPG
Views:	343
Size:	2.47 MB
ID:	2109155  
Old 07-14-2015, 04:26 PM
  #6  
RCISFUN
My Feedback: (44)
 
RCISFUN's Avatar
 
Join Date: Apr 2002
Location: Erie, PA
Posts: 6,437
Likes: 0
Received 1 Like on 1 Post
Default

Marc
That look great!
Old 07-14-2015, 06:32 PM
  #7  
rchobbymodels
 
rchobbymodels's Avatar
 
Join Date: Nov 2013
Posts: 545
Likes: 0
Received 0 Likes on 0 Posts
Default

Some key features of the VIXEN are:

Split fuselage aft of wings to make a compact transportation format.

This is what Marc is talking about



You can fit it in a minivan
Attached Thumbnails Click image for larger version

Name:	20150516_182942 (Copy).jpg
Views:	402
Size:	51.5 KB
ID:	2109235   Click image for larger version

Name:	20150516_183309 (Copy).jpg
Views:	402
Size:	88.2 KB
ID:	2109236  
Old 07-14-2015, 07:03 PM
  #8  
rchobbymodels
 
rchobbymodels's Avatar
 
Join Date: Nov 2013
Posts: 545
Likes: 0
Received 0 Likes on 0 Posts
Default

Let me post some new basic Vixen color scheme

Attached Thumbnails Click image for larger version

Name:	1 (1).png
Views:	304
Size:	131.7 KB
ID:	2109238   Click image for larger version

Name:	V1.jpg
Views:	314
Size:	108.3 KB
ID:	2109239   Click image for larger version

Name:	Vixen 2 (Copy).jpg
Views:	343
Size:	573.9 KB
ID:	2109240   Click image for larger version

Name:	Vixen1-3 (Copy).jpg
Views:	306
Size:	564.8 KB
ID:	2109241   Click image for larger version

Name:	Vixen1-4 (Copy).jpg
Views:	302
Size:	564.6 KB
ID:	2109242   Click image for larger version

Name:	4.png
Views:	341
Size:	109.0 KB
ID:	2109243   Click image for larger version

Name:	5.png
Views:	311
Size:	114.4 KB
ID:	2109244  
Old 07-14-2015, 07:32 PM
  #9  
rchobbymodels
 
rchobbymodels's Avatar
 
Join Date: Nov 2013
Posts: 545
Likes: 0
Received 0 Likes on 0 Posts
Default

A little more pictures from Marc's Vixen



The first picture shows the flaps linkage are internal, the second is the bottom of the color scheme, third is the back, fourth is the nose door gear installation and finishing (hinges are aluminum) and last one is the reinforcement (all the plane are reinforced with carbon fiber but did not show once it is done before the Airex layer), now all formers has an extra stripe of carbon fiber before installation.
Attached Thumbnails Click image for larger version

Name:	Photo_13.jpg
Views:	322
Size:	31.6 KB
ID:	2109245   Click image for larger version

Name:	Photo_14.jpg
Views:	343
Size:	40.6 KB
ID:	2109246   Click image for larger version

Name:	Photo_21.jpg
Views:	319
Size:	74.9 KB
ID:	2109247   Click image for larger version

Name:	Photo_39.jpg
Views:	306
Size:	52.8 KB
ID:	2109248   Click image for larger version

Name:	Photo_45.jpg
Views:	330
Size:	42.8 KB
ID:	2109249  
Old 07-22-2015, 10:44 AM
  #10  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

The VIXEN arrived earlier today, unpacked it after work hoping all was well.

The box looked as though it had been through the wars but luckily the main moulded parts were all in one piece with no damage, the canopy took a hit at some point and has been cracked and a piece missing at the rear on the side so hope to either repair, cover up or replace depending on time.

Paint is very good overall and nice not to have seams

Assembled the main parts and managed to get some shots in the sun tonight, looks like it wants to fly........

Will shoot some pics of the accessories although these might not be the final set as this is still the first 'production' model and my feedback will result in a few changes to hardware I am sure.

Bypass was included so will look to instal this and keep the propulsion system fully ducted, if time does not pan out will leave off for now.

More to follow over the next few days, enjoy.



marcs
Attached Thumbnails Click image for larger version

Name:	DSC_2138.JPG
Views:	344
Size:	2.82 MB
ID:	2110596   Click image for larger version

Name:	DSC_2140.JPG
Views:	305
Size:	2.81 MB
ID:	2110597   Click image for larger version

Name:	DSC_2142.JPG
Views:	293
Size:	3.10 MB
ID:	2110598   Click image for larger version

Name:	DSC_2150.JPG
Views:	297
Size:	2.84 MB
ID:	2110599   Click image for larger version

Name:	DSC_2152.JPG
Views:	295
Size:	2.83 MB
ID:	2110600   Click image for larger version

Name:	DSC_2153.JPG
Views:	284
Size:	2.82 MB
ID:	2110601  
Old 07-23-2015, 07:09 AM
  #11  
RCISFUN
My Feedback: (44)
 
RCISFUN's Avatar
 
Join Date: Apr 2002
Location: Erie, PA
Posts: 6,437
Likes: 0
Received 1 Like on 1 Post
Default

Marc / Wagner
It looks great!

I miss mine!

Can you get some internal shots when you get a chance
Old 07-23-2015, 07:26 AM
  #12  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

Will do.

marcs
Old 07-23-2015, 07:52 AM
  #13  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

Nose wheel area:



Equipment tray middle support:



Duct blending:



Turbine former assembly (without and with lower bypass in place:



Rear main fuselage jointing section:



Rear section jointing face:



Rear pipe support and fin support formers:



marcs
Attached Thumbnails Click image for larger version

Name:	DSC_2159.JPG
Views:	330
Size:	2.73 MB
ID:	2110804   Click image for larger version

Name:	DSC_2160.JPG
Views:	312
Size:	2.71 MB
ID:	2110805   Click image for larger version

Name:	DSC_2161.JPG
Views:	291
Size:	3.21 MB
ID:	2110806   Click image for larger version

Name:	DSC_2162.JPG
Views:	283
Size:	2.83 MB
ID:	2110807   Click image for larger version

Name:	DSC_2163.JPG
Views:	313
Size:	2.85 MB
ID:	2110808   Click image for larger version

Name:	DSC_2164.JPG
Views:	333
Size:	2.83 MB
ID:	2110809   Click image for larger version

Name:	DSC_2165.JPG
Views:	285
Size:	2.85 MB
ID:	2110810   Click image for larger version

Name:	DSC_2166.JPG
Views:	272
Size:	3.17 MB
ID:	2110811  

Click image for larger version

Name:	DSC_2167.JPG
Views:	273
Size:	3.04 MB
ID:	2110812   Click image for larger version

Name:	DSC_2168.JPG
Views:	282
Size:	3.19 MB
ID:	2110813  
Old 07-23-2015, 11:22 AM
  #14  
BILLYDSRC
 
BILLYDSRC's Avatar
 
Join Date: Nov 2009
Location: AUSTINTOWN, OH
Posts: 564
Likes: 0
Received 0 Likes on 0 Posts
Default

I put my order in for one!!! Winter project for me.
Marc I love the Electron undercarriage. I had one made for the 2.5 viper and they works Great for my customers who have them!!
Thanks Billy D
Old 07-24-2015, 12:38 AM
  #15  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

Fin

The rudder is pre hinged with a full length wire pin running through 3 pre-fitted lugs glued into the rudder, all moves freely without slop.

The servo location is inside the base of the fin rather than a hatch on the side, looks neater but slightly more fiddly to get the servo in. I'm using JR8511's on most surfaces and the pre-cut hole in the plate glued in the fin to accept the rudder servo was a perfect fit with no extra work needed, even the pilot holes for the servo screws lined up too.

I had to open out the opening in the base of the fin a little to get the 8511 in but this was a 10 minute job using my Permagrit files which if you have not heard of these tools do a Google search as they are invaluable to any model builder (big plug!).

I have not yet worked out the best servo arm lenght to get the desired throws (rudder 38mm from base line at rudder base) but have a 25mm and a 30mm arm on order to see which is best.

Rudder horns are supplied and are nicely made items cnc cut from 3mm carbon fibre plate, slots are pre made in the rudder so most of the work is done but they need opening out and preparing to accept the horns. Picture shows them in place but not glued, I will Hysol later today.

Rudder fixing to fuselage is via two aluminium rods (solid) which are well secured inside the fin and locate into the very strong formers fitted inside the rear section (picture in earlier post). Fin is secured to fuselage via two M3 bolts.



marcs
Attached Thumbnails Click image for larger version

Name:	DSC_2169.JPG
Views:	85
Size:	2.68 MB
ID:	2110934   Click image for larger version

Name:	DSC_2170.JPG
Views:	70
Size:	2.76 MB
ID:	2110935   Click image for larger version

Name:	DSC_2169.JPG
Views:	244
Size:	107.3 KB
ID:	2110936   Click image for larger version

Name:	DSC_2170.JPG
Views:	233
Size:	99.3 KB
ID:	2110937  

Last edited by marc s; 07-24-2015 at 12:55 AM.
Old 07-24-2015, 12:56 AM
  #16  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

I'm reducing the file size of the pictures ongoing so they load quicker for those interested.

marcs
Old 07-24-2015, 02:28 AM
  #17  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

Fin

Having adjusted holes and trimmed the tabs on the horns for a nice fit I keyed the horn tabs with an abrasive wheel and cleaned with acetone. I once had a messy experience with gluing horns so now I mask the slots so as not to make the same mistake again.

Blew out the slots to remove any dust etc and checked there was a hard block inside the rudder were the glue would fix properly to - there was phew!

Mixed up some 9462 with a spot of black pigment, filled the slots, fitted the horns - I repeat this a few times recharging the slots with epoxy to make sure its well covered and once happy pushed home the horns. I clean up the excess glue with cotton buds (Q-tips I think they are called in the US) remove the masking tape and leave to dry.

As the ball links I have on order for these horns have a 6mm wide fitting I added 6mm worth of washers to the horns using an M3 bolt to secure them so the spacing will be right when the linkage is attached, it also helps keep the horn holes in alignment.



marcs
Attached Thumbnails Click image for larger version

Name:	DSC_2171.JPG
Views:	253
Size:	144.7 KB
ID:	2110947   Click image for larger version

Name:	DSC_2172.JPG
Views:	266
Size:	104.8 KB
ID:	2110948   Click image for larger version

Name:	DSC_2173.JPG
Views:	260
Size:	135.0 KB
ID:	2110949  
Old 07-27-2015, 06:12 AM
  #18  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

Speed Brake

The speed brake was an item I was keen to incorporate into this jet and Xtreme have included a well proportioned brake and supplied it pre-fitted with aluminium hinges.

I would have preferred to either have hinges not fitted or hinges that you could remove the pins from so that the brake could be removed to work on fitting the linkage. Hopefully the latter will be done on later kits.

When Rich built the first prototype he arranged the speed brake servo forward of the actual brake in front of the rear wing tube former, this location resulted in the servo location being off centre as the former has a central strengthening post, as a result and due to my weird desire to keep things symmetrical I have opted to locate the servo behind the brake so it can remain central. Hopefully it wont cause any issues operating the brake located here.

With hinges fitted all that is required to do is fit the horns, these are supplied as two cnc cut carbon fibre items which have long base legs to extend mid way down the brake to give a good area to fix the horns to. I guess you can fit them close together like a 'double' horn in between the hinges, I opted to spread them outboard of the hinges and make up a simple linkage bar from some 3mm threaded rod and copper tube slipped over at each end to locate the ball link at the mid-point.

Marked up the brake, keyed the area where the horn base legs were located positioning the linkage over the hinge point. Scuffed the horns, tacked them in place with cyano and microballons and then filleted with Hysol.

There is a servo tray supplied which comes in 4 parts, made from the same carbon sandwich material used in the formers of the Vixen, it assembles easily and after keying and cleaning with acetone I glued with cyan and microballons. The JR8511 fitted exactly without modification.

Sorted the threaded M3 rod linkage and ball link to give the right length and keyed the servo mount and fuselage base. Glued servo mount to fuselage with Hysol.

Attached Thumbnails Click image for larger version

Name:	DSC_2231.JPG
Views:	283
Size:	128.3 KB
ID:	2111366   Click image for larger version

Name:	DSC_2229.JPG
Views:	280
Size:	150.6 KB
ID:	2111367   Click image for larger version

Name:	DSC_2233.JPG
Views:	289
Size:	151.3 KB
ID:	2111368  
Old 07-27-2015, 07:22 AM
  #19  
schroedm
My Feedback: (1)
 
schroedm's Avatar
 
Join Date: Jul 2002
Location: SevenoaksKent, UNITED KINGDOM
Posts: 5,193
Likes: 0
Received 0 Likes on 0 Posts
Default

Marc,

Another option to open the speed brake from that servo position is to do it the same way as on a Hawk. Would be a simpler setup as there'd be no need for the extra horns and linkage bar - just a lug toward the mid/rear of the speedbrake to connect to. Would also offer more mechanical advantage?



M
Attached Thumbnails Click image for larger version

Name:	abforhawk.jpg
Views:	260
Size:	50.9 KB
ID:	2111376  
Old 07-27-2015, 07:55 AM
  #20  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

Mark, possible solution too, might need to raise the servo mount up to get the angle which would involve some mods to the servo frame but possible - appreciate the suggestion.

marcs
Old 07-27-2015, 08:41 AM
  #21  
Dave Wilshere
 
Join Date: Jun 2002
Location: Watford, UNITED KINGDOM
Posts: 11,000
Likes: 0
Received 3 Likes on 3 Posts
Default

Is that bar supported? If not air pressure with bow it and it will end up with a "set"

Dave
Old 07-27-2015, 08:54 AM
  #22  
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,288
Likes: 0
Received 0 Likes on 0 Posts
Default

Dave it's a stainless M3 threaded rod with a copper sleeve over it each side of the ball link, I'm pretty sure it will be fine but as an alternative I have a length of 3mm solid carbon rod which might serve better - will check the flex once the servo mount has cured.

If it proves not to be stiff enough I will upgrade to a 4mm carbon rod or tube.

marcs
Old 07-27-2015, 09:13 AM
  #23  
RCISFUN
My Feedback: (44)
 
RCISFUN's Avatar
 
Join Date: Apr 2002
Location: Erie, PA
Posts: 6,437
Likes: 0
Received 1 Like on 1 Post
Default

As has been pointed out the large span between horns might not be ideal, but can be overcome using the methods you described.
The other observation I have is with the servo behind the air brake it appears that you can not use the mechanical advantage of the servo arm position, (i.e. directly away and in line with the linkage) when the air brake is fully deployed with the servo arm that is shown.
Old 07-27-2015, 09:33 AM
  #24  
Dave Wilshere
 
Join Date: Jun 2002
Location: Watford, UNITED KINGDOM
Posts: 11,000
Likes: 0
Received 3 Likes on 3 Posts
Default

Originally Posted by RCISFUN View Post
As has been pointed out the large span between horns might not be ideal, but can be overcome using the methods you described.
The other observation I have is with the servo behind the air brake it appears that you can not use the mechanical advantage of the servo arm position, (i.e. directly away and in line with the linkage) when the air brake is fully deployed with the servo arm that is shown.
Two evils! If the pushrod is pushing then it will flex (OK maybe shorter that way around) If Marc had used a standard metal arm and a ball link he could have the arm inline..but then all the load is on the servo output spline and servo bearings. The forked clevis arm reduces that.
Ultimately I prefer an air ram, servos are loaded always and if they get a stuck gear you can't land with the airbrake open to slow it (without perfect timing on a switch) as the servo will be destroyed, an air ram can compress.
With the 8511 holding power and expected slow flight from big flaps, it won't be loaded too much/too long.
Old 07-27-2015, 02:35 PM
  #25  
RCISFUN
My Feedback: (44)
 
RCISFUN's Avatar
 
Join Date: Apr 2002
Location: Erie, PA
Posts: 6,437
Likes: 0
Received 1 Like on 1 Post
Default



Dave I agree, pulling is always better than pushing when it comes to longer
control rods. However, In my set up it was short and was a non-issue

You do need a very hi torque servo for this set up though.

As far as needing the airbrake, the first couple of flights were flown without using it, the flaps are very effective, the air brake is a bonus!
Attached Thumbnails Click image for larger version

Name:	P1150699.JPG
Views:	279
Size:	966.2 KB
ID:	2111415  

Last edited by RCISFUN; 07-27-2015 at 02:38 PM.

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.