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Skygate/CARF Viperjet

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Skygate/CARF Viperjet

Old 06-10-2012, 05:25 PM
  #76  
1ricardo
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Default RE: Skygate/CARF Viperjet

I have a flash that use the carbon bell mount, but since this OD tube fits perfectly on the by pass I imagine this set up is just like a BVM /Bandit where the tube is screwed on the by pass and just touch the fuse on the rear end.
But I have now ideia about the size difference
Old 06-10-2012, 05:35 PM
  #77  
pfact
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Default RE: Skygate/CARF Viperjet

the photos I had for you didn't upload - here is another attmept. They clearly show what is needed.

Phil
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Old 06-10-2012, 05:45 PM
  #78  
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Default RE: Skygate/CARF Viperjet

It does not really matter how Skygate did theirs, CARF changed the design slightly.
Old 06-11-2012, 06:41 AM
  #79  
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Default RE: Skygate/CARF Viperjet

Peter

You are correct about design changes. I received an email from Andreas Gietz last night indicating that the pipe was intended to rest on the rear edge of the fuse and that the partial bypass should be pushed back 8 cm to get the aft end of the pipe to the end of the tail cone.

He also sent me some photos of a completed Viper - they helped quite a bit in sorting things out. The black rings I was curious about are meant to be stacked one on top of another to make a vertical holder for the JetCat fuel filter and Ricardo was correct about the mounts for the hopper and fuel tanks.

The rings to hold the pipe at the tail are no longer provided. I have seen what pipe temperatures do to an Ultralightning tail cone so I will try to make my own support rings. I have a CNC router which should do the job.

I appreciated the photos and info Andreas provided, it will allow me to move forward with my build. Unfortunately, the main theme was to deride me for forwarding his email about the wing repair kit. His email indicated that he has been following the threads about the viper. You can draw your own conclusions about why he chose not to chime in to help us or post more info on the CARF web site despite multiple threads over many months reporting worldwide frustration with the absence of an assembly manual. He did indicate that an assembly manual was forthcoming sometime in the not near future.


Phil



Old 06-11-2012, 09:12 AM
  #80  
basea
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Default RE: Skygate/CARF Viperjet

Phil

Please post the photos from Andreas. I am struggling a little but did manage to work out the tail pipe situation. It really is odd that they won't make more information available. Ok the manual is some way off (we can argue about whether that is acceptable) but a few photos really help!
Old 06-11-2012, 09:54 AM
  #81  
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Default RE: Skygate/CARF Viperjet

We need to ask Andreas if its ok to post his photos - he was more than upset that might have let the world know about a possible problem with the wings.

Phil


Old 06-11-2012, 11:51 AM
  #82  
1ricardo
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Default RE: Skygate/CARF Viperjet

Yes, It´s better of ask him!
Old 06-11-2012, 11:52 AM
  #83  
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Default RE: Skygate/CARF Viperjet

Mean while did any one install the stab servo? Should I brake the first rib in order to get access to the servo base?
Old 06-11-2012, 12:47 PM
  #84  
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Default RE: Skygate/CARF Viperjet


ORIGINAL: 1ricardo
Mean while did any one install the stab servo? Should I brake the first rib in order to get access to the servo base?
Yes you have to remove the thin ply piece across the rib, otherwise you cannot install the servo !!!!!

Old 06-16-2012, 05:04 AM
  #85  
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Default RE: Skygate/CARF Viperjet

Phil

Sorry for the delay but here is a photo of my turbine installation. Pretty straightforward after I had looked at it for a while. I beefed up the engine bearers and narrowed the gap slightly so my P160SX fits. The position of the bell mouth is dictated by the thrust tube ending up flush with the tail cone. Mine is about 8cm back from the forward former. If you have a JetCat you will also need to mount the engine 'upside down' i.e. retaining strap lowermost. I also needed to drill 2 extra mounting holes as the rear ones ended up behind the rear bulkhead! Hope the photo makes it obvious.
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Old 06-16-2012, 06:03 AM
  #86  
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Default RE: Skygate/CARF Viperjet

Andy

I came up with a similar install method for my P160sx. I pushed the carbon housing back approx 7cm until it wedged into the tail cone. I attached the tail cone to the pipe with 3, 3mm bolts (see photo)

I made mounting plates that sit under the Jetcat engine holder (see photo). These plates stiffen up the entire setup plus they allowed me to bolt into the center of the plane's engine mount instead of the edge like you have done. The Skygate version used a similar method. My turbine is upright and still sits low in the bell so I will make another plate to raise it up a couple more mm.

The odd part is that this plane was designed for the P160 - I am surprised that the gap between the engine mounting plates was too wide to fit the P160 without modification, I guess its an accommodation for multiple turbine manufacturers.

Phil
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Old 06-16-2012, 06:23 AM
  #87  
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Default RE: Skygate/CARF Viperjet

I have finished my elevator servo installation and thought I should post some photos.

I used JR 8411's - the thickness of the horizontal stab is a little too small to fit 8711's or 8611a's without deforming the skin of the horizontal stab. I am hoping that 155oz of torque will be enough, this is where a manual or someone at CARF to talk with would be great to see if this is enough torque. Getting the 8411's to sit flush with the mounting plate required cleaning out excess epoxy from the joint between the servo mounting plate and the underside of the skin. I used a small router bit in a Dremel flex shaft to carefully remove the excess epoxy while carefully avoiding the foam core on the undersurface of the skin. Finding a path for the servo wire required a bit of thought - I couldn't see away to get it around either of the tube sockets so I routed a thin slot into the mounting plate (see photo).

Be careful cutting the linkage slot - there is a line scribed into the skin on the stab surface but it is not where it needs to be - it was 3mm too far inboard on my stab.

I used 1" SWB servo arms for clevis - they permit more than enough throw.

Phil
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Old 06-16-2012, 06:24 AM
  #88  
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Default RE: Skygate/CARF Viperjet

Hey guys

Has anyone out there completed installation of their rudder servo? If so could you post photos of how you attached the servo to the rudder?

Phil

Old 06-16-2012, 06:39 AM
  #89  
basea
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Default RE: Skygate/CARF Viperjet

Herewith rudder and tailplane photos.
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Old 06-16-2012, 09:49 AM
  #90  
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Default RE: Skygate/CARF Viperjet

Hi guys
please posts more and more pictures of this built
i am expacting my VIPER in about 3 weeks and i will use all your post
thank you
best
Old 06-16-2012, 12:00 PM
  #91  
Asif
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Default RE: Skygate/CARF Viperjet


ORIGINAL: pfact

I have finished my elevator servo installation and thought I should post some photos.

I used JR 8411's - the thickness of the horizontal stab is a little too small to fit 8711's or 8611a's without deforming the skin of the horizontal stab. I am hoping that 155oz of torque will be enough, this is where a manual or someone at CARF to talk with would be great to see if this is enough torque. Getting the 8411's to sit flush with the mounting plate required cleaning out excess epoxy from the joint between the servo mounting plate and the underside of the skin. I used a small router bit in a Dremel flex shaft to carefully remove the excess epoxy while carefully avoiding the foam core on the undersurface of the skin. Finding a path for the servo wire required a bit of thought - I couldn't see away to get it around either of the tube sockets so I routed a thin slot into the mounting plate (see photo).

Be careful cutting the linkage slot - there is a line scribed into the skin on the stab surface but it is not where it needs to be - it was 3mm too far inboard on my stab.

I used 1'' SWB servo arms for clevis - they permit more than enough throw.

Phil

Phil,
Please update as many pictures as you can. My Viper will be here in 2 weeks and I ordered JR8711 for all the surfaces two days ago with my local hobby shop, guess have to revise my servo order. Will 8711 fit rudder, ailerons, and flaps?
Thanks of all your pictures, this will be a great help when I start mine.
Asif
Old 06-16-2012, 02:27 PM
  #92  
pfact
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Default RE: Skygate/CARF Viperjet

Asif

8711's will everywhere else.

phil
Old 06-16-2012, 03:29 PM
  #93  
Asif
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Default RE: Skygate/CARF Viperjet


ORIGINAL: pfact

Asif

8711's will everywhere else.

phil

Thanks Phil.
Asif
Old 06-16-2012, 03:52 PM
  #94  
pfact
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Default RE: Skygate/CARF Viperjet

Asif

You will need mounting hardware for the aileron servos. I am using aluminum servo brackets that I bought from Dramworks. they with only a little modification to the opening in the wing.

Phil
Old 06-16-2012, 03:56 PM
  #95  
Asif
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Default RE: Skygate/CARF Viperjet


ORIGINAL: pfact

Asif

You will need mounting hardware for the aileron servos. I am using aluminum servo brackets that I bought from Dramworks. they with only a little modification to the opening in the wing.

Phil
Phil,
Can you please post some pictures. What about
Flaps, how is the servos mounted. Should I get that too from dreamworks or it's
Included in the kit?
Thanks
Asif
Old 06-16-2012, 04:58 PM
  #96  
pfact
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Default RE: Skygate/CARF Viperjet

The flap servo mounts into a wooden plate that is installed at the CARF factory
Old 07-04-2012, 06:47 AM
  #97  
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Default RE: Skygate/CARF Viperjet

HI guys,

I got a little more done on my VIper.

I installed the wing reinforcement kit from CARF - the instructions were great and other than it being a bit messy wasn't very hard.

The aileron servo installation is pretty straight forward. I used aluminum mounts that I bought from Dreamworks (first photo), 8711 servos, and SWB 1" double lock control arms for clevis. I attached the mounts to the cover plate with 4, 3mm button head screws and nylock nuts (second photo). I had to trim the lip of the opening in the wing a bit to get the servo mounts to fit but they make for a secure, clean installation. CARF did a nice job of including a reinforcement plate under the wing opening which makes for a very secure attachment for the cover plate. Note that I didn't use the rubber grommets in the servos to reduce the risk of flutter, ala BVM. I used a 6mm titanium turnbuckle to connect the servo to the aileron control horns, a 55mm one would have been ideal. I received wooden servo mounts with the wing reinforcement kit that CARF sent out but they arrived a day too late - if I had had them I would have used them instead.

I also tackled the flap servo installation. Servo mounting is easy if you have a long enough screw driver. I used an untrimmed JR nylon servo horn and the shorter of the 2, 3mm push rods in the wing hardware bag. It just skims along the upper skin of the wing without distorting it. The opening for the flap push rod was 3mm too far inboard to line up with the servo horn if a clevis is used so I widened it a little to keep the push rod from rubbing on the aft wing plate. Other than that flap installation was simple.

Next up is the rudder

Phil
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Old 07-04-2012, 06:59 AM
  #98  
pfact
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Default RE: Skygate/CARF Viperjet

The rudder servo installation was pretty straight forward too

The first photo shows the openings I made in the rudder plate. The draft instructions CARF have just distributed suggest that drilling a hole is sufficient but I found that a larger opening is required to prevent the push rods from binding on the airex plate. I used the standard JR servo horn and mounted the servo without rubber grommets. The servo horn goes toward the back of the rudder.

The delrin plate on the bottom of the rudder is removable. The CARF instruction suggest epoxying 3mm button head bolts into the plate, instead I use nylock nut and surrounded them with aeropxy so the the control arms could be unscrewed without dismantling the rudder.

I also installed nylon bushings in each of the 3 rudder mounts and used a carbon fiber tube instead of the supplied brass tube. I have done this with most of my CARF planes. The carbon fiber doesn't get bent out of shape and trapped in the rudder like brass tubing.

I am moving to the west coast this month so I may not get much more done.

Sorry about the photos being upside down - it only happens when I use photos taken with my iPhone.

Phil
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Old 07-04-2012, 08:19 AM
  #99  
1ricardo
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Default RE: Skygate/CARF Viperjet

Hello Phil,

I notice that you don´t use the rubber grommets on the prof servo. Why is that?

Thanks
Old 07-04-2012, 10:21 AM
  #100  
Dave Wilshere
 
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Default RE: Skygate/CARF Viperjet

You guys had the draft instructions yet (I know Andy has )

Dw

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