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Skygate/CARF Viperjet

Old 08-08-2015, 10:08 AM
  #401  
sportflya
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Well guys we had a successful maiden. Zero trim 6min flights 12oz of nose weight at recommend cg. All throws are the recommended throw. What a winner!!!
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Old 08-08-2015, 10:31 AM
  #402  
sailing1
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Congratulations. Love your color scheme. I am getting ready to add telemetry to mine mostly for the speed and altitude.
Old 08-14-2015, 12:03 PM
  #403  
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Finally I got some nice shots in the air of my Viper.
It flies like a dream and the Merlin M200 provides short take off and realy good vertical


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Old 08-14-2015, 06:20 PM
  #404  
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Wow, great pictures.
Old 08-15-2015, 04:41 AM
  #405  
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Originally Posted by sailing1 View Post
Wow, great pictures.
Agreed.. Amazing flying site you have there
Old 08-15-2015, 06:37 AM
  #406  
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Absolutely beautiful flying field! Love the knife edge with the water fall and mountains in the back ground! Congrades on your Viper too!!
Old 08-16-2015, 11:03 AM
  #407  
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Thanks guys
The airport is under Vinnu waterfall, the tallest waterfall in Europe and the sixth tallest in the world. The rc club has two hangars dedicated to rc planes.
Since we were flying in a narrow valley, it will be much vertical movement.

https://youtu.be/yl2IyCt8aWA
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Old 11-22-2015, 12:13 PM
  #408  
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There is a growing number of Vipers in the UK. No1 sales man Big Geoff loves his P-160SX powered version.
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Old 11-22-2015, 12:47 PM
  #409  
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Yes, loving the model. Its the slow speed that everyone comments on.

Last edited by Geoff White; 11-22-2015 at 01:12 PM.
Old 11-23-2015, 02:23 AM
  #410  
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Default Like mine too

Just in case one needs attention I will always have one in my hangar.

Yes also,
I like mine a lot. It never feels that its going to bite you and flies rock steady all the way. ( with a little help from a Demon in my case )
If it can survive this then it says lots about the design and build of the C.A.R.F version. Mine has the 180 Rx

https://www.youtube.com/watch?v=niXx6xaBgFc






Photo courtesy of Dave Wilshere at RAF Wyton .Sadly no more flying there on a now housing estate
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Last edited by skywarrior; 11-23-2015 at 02:35 AM.
Old 11-24-2015, 11:53 AM
  #411  
havard.j
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Originally Posted by skywarrior View Post
Yes also,
I like mine a lot. It never feels that its going to bite you and flies rock steady all the way. ( with a little help from a Demon in my case )

Have you done any modifications on the wires to the Cortex Demon? I'm a little worried about using only two leads with power to it.
Old 11-24-2015, 04:31 PM
  #412  
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Hi
Yes I have followed G White in supplying current to the servos via pos-neg then detaching the signal from the plug and connecting that in a separate plug into the Cortex.
This way the Cortex only supplies a signal and power comes direct from the Power box plug. In my case a competition SRS or on my second Viper a Royal.
I briefly talked to Demon at Jetpower and they said they were considering this for the future as well.
Regards
David
Old 01-01-2016, 06:02 PM
  #413  
bluelevel
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Is there a reason why everybody moves the thrust tube so far backwards that it sits flush with the fiberglass tailcone? Wouldn't it be advised to move the turbine and thrust tube closer to the tank and slightly cut the fiberglass tailcone instead of adding useless nose weight?
Old 01-01-2016, 06:28 PM
  #414  
sailing1
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My pipe is mounted such that the pipe is about 1/2 inch inside the tail cone. Have the cone coated with some BVM heat shield on the inside but nave never noticed any heating of the cone. Power is from a Rhino. I also have my smoke tube coming out back of pipe.
Old 01-01-2016, 06:35 PM
  #415  
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I am installing a pretty short turbine (Merlin 200) and if I move the thrust tube & turbine all the way forward so that the starter motor almost touches the back side of the tank, the thrust tube ends about 45mm (1 inches) inside the tail cone. My idea was to cut the tail cone slightly. This would move the CG further forward so that I would not need any nose weight.
Old 01-01-2016, 06:54 PM
  #416  
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My tube is also mounted with about 3/4 inch inside, no problem with. Think you may cut 1 inch with no problem, Nevertheless I have more than 1 lbs of lead in my nose, but this is no problem for the Viper.
Old 01-02-2016, 06:07 AM
  #417  
sailing1
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Didn't need any lead in the front for my Viper. Have my flight packs plus ECU and Electric gear batteries up front. Had plenty of room so just went with larger batteries for ECU and Gear and balance worked out just fine. Plane has full smoke setup and weights 36 lbs dry (with full UAT).
Old 01-10-2016, 10:29 AM
  #418  
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For the last month and half i been building my new Viper and this is some of the pictures of my building and I just finish last night the inside all i got left is install 2 servos Rudder and 1 aileron and finish the main gear door also i got a set of unilights i will be installing
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Old 01-10-2016, 01:42 PM
  #419  
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Originally Posted by bluelevel View Post
Is there a reason why everybody moves the thrust tube so far backwards that it sits flush with the fiberglass tailcone? Wouldn't it be advised to move the turbine and thrust tube closer to the tank and slightly cut the fiberglass tailcone instead of adding useless nose weight?
Hey Thomas! Didn't know you bought one! I looked at mine today to remember the mounting. I don't see any reason that you can't do it that way. You will only get about an extra inch forward. I am sure it will help eliminate some nose weight. Let me know when you are going to maiden, and I will come out to watch.
Old 01-10-2016, 02:32 PM
  #420  
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Thomas.
Do you know where the balance is yet? Nose weight wise...
When you put it together please check the wheel/tyre clearance on both the fuselage and wing cut out, I've seen people miss this and have the main gear hang up as its jammed up.

It does not look like you sealed the woodwork at all before installation started? Smoke system and fuel you will end up with some oil in the fuselage at some time, untreated wood is like a sponge! Just a coat of finishing resin would have been enough.

Otherwise great job, neat builder.

Dave
Old 01-10-2016, 03:10 PM
  #421  
bluelevel
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@Dan

I had it sitting in my garage boxed up for several months, just didn't have the time to start the build. But now she's coming together nicely. Probably 2 weeks and I should have her ready to maiden.

Thomas
Old 01-10-2016, 03:15 PM
  #422  
RCFlyerDan
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Originally Posted by bluelevel View Post
@Dan

I had it sitting in my garage boxed up for several months, just didn't have the time to start the build. But now she's coming together nicely. Probably 2 weeks and I should have her ready to maiden.

Thomas

Cool Beans!! I am looking forward to seeing more nice jets at CC. If you need to look at anything on mine, please ask, or any advice. I posted a lot of pictures earlier in this post to help. It is a fun and easy jet to fly.

With a 200, it should be pretty fast and unlimited vertical!! Are you adding an extra fuel tank? You have seen me dead stick mine, due to flying too long. I now have my timer to 6.5 minutes.

Last edited by RCFlyerDan; 01-10-2016 at 03:21 PM.
Old 01-10-2016, 04:55 PM
  #423  
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Thomas,

Can you post a picture of how you mounted the front pilot seat?

Phil
Old 01-10-2016, 06:24 PM
  #424  
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Hi
As a matter of interest mine now balances at the rear of the main spar. Had 70 odd flights like this and its better for me than the other 60 at the front of the spar.

180 Rx with one 3 cell lipo half way up the side of the nose bay and two 5400 lipo's for Rx in front and as far forward of the nose wheel tire as possible. Lots of weight but it matters not to this plane it flies great and tracks like a train.

I also fly with one of the best UK fliers who also has this balance point. It has not let him down either.

Regards

David

Rt photo by Dave Wilshere / always liked this one David
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Last edited by skywarrior; 01-11-2016 at 08:46 AM.
Old 01-14-2016, 10:23 AM
  #425  
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Below are a few pics of my build progress so far. I hope these might be helpful to others building the same plane.

The wings are done, I chose to go with the Behotec electric gear & brakes. Installation was pretty easy and straight forward. Stabs and rudder are also done, I am using Savox SV 1270 TG on all flying surfaces.

The Robart hinges for the front gear door are in, I also glued in an additional bulkhead in the front to hold the servo that actuates the gear door.

For the tank I chose to go with the bigger one from the large Hawk, I am pretty sure that my Merlin 200 will need the extra fuel capacity. I also glued a tray on top of the main tank to accomodate the smoke tank, which is actually a Flash wing tank.

The back of the plane is also completely wired & plumbed, the turbine and smoke tubes are installed. I moved the turbine as far forward as possible to save a little nose weight, this change required to shorten the exhaust nozzle a little.

Thomas
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Last edited by bluelevel; 01-14-2016 at 10:37 AM.

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