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Another Skymaster Viper

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Old 10-06-2009, 01:57 AM
  #176
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Default RE: Another Skymaster Viper

Heraldo, Jclittle,

Thanks for your feedback... Actually what i would like to know if the Viper jet has a tendency to stall at slow speed or if it is quite safe to slow her down without taking much risk. Will crow braking be effective on this jet?

Thanks again.
Best regards,
Dany
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Old 10-06-2009, 02:31 AM
  #177
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Quote:
ORIGINAL: Ali

yep I am sure that would help but the carbon rod is just as if not more stiffening as well as being super quick to do.

Also another bit of good news for all you Viper jet owners out there... I have had Pull Over products in Germany make me a gorgeous set of padded and lined custom bags for the wings and tails to help protect your pride and joy.

Two piece wing bags securely clip closed and even have a slide of wing tip protector.


Picked up a set at JP myself also. (apparently, one set already had my name on it, go figure )

Great quality, I think I'll order sets for my other jets as well.

Hans
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Old 10-06-2009, 02:50 AM
  #178
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Default RE: Another Skymaster Viper

Received my Viper yesterday. Only waited four weeks. It is in the Canada scheme & looks very well made.
Can anyone post a list of recommended mods for the newer kits. I am sure some of the mods required by the older kits will have been fixed at the factory. I just don't know what ones still need to be done.
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Old 10-06-2009, 03:08 AM
  #179
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Quote:
ORIGINAL: Jascat100

Received my Viper yesterday. Only waited four weeks. It is in the Canada scheme & looks very well made.
Can anyone post a list of recommended mods for the newer kits. I am sure some of the mods required by the older kits will have been fixed at the factory. I just don't know what ones still need to be done.

Don't say that!! [:@][:@]

Still waiting patiently for mine....

+1 for the list of recommended mods though!
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Old 10-06-2009, 03:45 AM
  #180
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Default RE: Another Skymaster Viper

A good friend of mine (John) received a Viper the other day, he has waaaaay more building experience than I have, and are planning the following mods, which I will follow on mine also:

1) Change the pinhinges for the rudder to Robart stuff, and add 2 more (so a total of 5), and add blocks to support each hinge (as the hinge point is far out from the surface it is glued to)
2) Make some "U" shaped upright ply/carbon reinforcements for the landing gear (where the mount touches the upper skin, very weak)
3) Add triangle balsa (15x15 mm) in the aileron and flap openings in the wings, there is quite a distance from the ply inside the opening to the hinge line
4) Ditch the plastic horns delivered with the kit, we are doing our own "heavy duty" horns from 2.5mm carbon, using two on each surface with a 3mm ball link between them (the original ones goes only 5..6 mm into the surface, the new ones 12..15 mm)
5) Add a bead of epoxy in the front of the canopy (the curved fiber), it is too soft
6) The cockpit tubs from Skymaster are extremely brittle, will need reinforcements (mine was already broken several places when I received it at JetPower!)

EDIT:
7) Add two canopy hooks in the middle of the canopy rails, one on each side
8) Lock the tubes for the elevator, one of them has no stop
9) Remove front brace in canopy (gets in the way for the pilot )
I think that was what we have talked about so far, interested in other peoples list also !
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Old 10-06-2009, 05:58 AM
  #181
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Default RE: Another Skymaster Viper

Don't forget to add a couple of canopy hooks about the mid-point on the canopy rail. This keeps the canopy from expanding at high speed and blowing off.
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Old 10-06-2009, 06:01 AM
  #182
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Default RE: Another Skymaster Viper

Thats right Craig, I forgot about these in my post!
If you add these, is it then ok to remove the brace in the front of the canopy (it "sits" right in front of the front pilot otherwise) ?
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Old 10-06-2009, 09:23 AM
  #183
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Default RE: Another Skymaster Viper

Thanks guys. I can now start the build with some confidence.
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Old 10-06-2009, 09:43 AM
  #184
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Default RE: Another Skymaster Viper

just received more Vipers for our customers...

we are working at the moment to get the carbon Rudderhorn made
carsten made a nice DXF drawing for them , now i will look for a Carbot sheet and make a few.
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Old 10-06-2009, 11:22 AM
  #185
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Default RE: Another Skymaster Viper

and when you've made a few sandor
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Old 10-06-2009, 11:37 AM
  #186
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Default RE: Another Skymaster Viper


Quote:
ORIGINAL: Slam_Dunc

and when you've made a few sandor

i will have no choice then to part with them against a financial interesting bid.

learned from Jim
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Old 10-06-2009, 12:26 PM
  #187
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Default RE: Another Skymaster Viper

Payment in stickers!! LOL.
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Old 10-06-2009, 12:36 PM
  #188
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Default RE: Another Skymaster Viper

What about horns for the rest of the flying surfaces as some have suggested that they are a tad on the small side.
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Old 10-06-2009, 01:00 PM
  #189
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Default RE: Another Skymaster Viper

Quote:
ORIGINAL: digitech


Quote:
ORIGINAL: Slam_Dunc

and when you've made a few sandor

i will have no choice then to part with them against a financial interesting bid.

learned from Jim
No charge for lessons Sandor MacKruise
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Old 10-06-2009, 01:05 PM
  #190
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Quote:
ORIGINAL: Selleri

What about horns for the rest of the flying surfaces as some have suggested that they are a tad on the small side.
Sverrir,
we are using them on all the surfaces, we are doing 14 horns pr plane, 7 surfaces, double horns and a 3mm ballink between the horns (like many of the comparf planes)
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Old 10-06-2009, 01:40 PM
  #191
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Default RE: Another Skymaster Viper

Cheers Carsten.

In that case Sandor put me down for one set.
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Old 10-06-2009, 01:42 PM
  #192
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Default RE: Another Skymaster Viper

Sandor McKruise,
I told you so, everyboy wants your horns
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Old 10-06-2009, 05:52 PM
  #193
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Default RE: Another Skymaster Viper


Quote:
ORIGINAL: cgroen

Thats right Craig, I forgot about these in my post!
If you add these, is it then ok to remove the brace in the front of the canopy (it ''sits'' right in front of the front pilot otherwise) ?
Yes, remove the brace. You don't need it and it gets in the way.

Craig
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Old 10-06-2009, 09:29 PM
  #194
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Default RE: Another Skymaster Viper

I really like all of these suggestions esp the doubling up of larger spec horns with a ball link in the center.

I also have seen and recommend an additional fixing bolt for the wings instead of just relying on the aluminum tab. There is room to fit one with access thru the wheel well for installation.

Throw away the stock aluminum tube and order a 1.5" x 48" carbon fibre tube from TBM. I have seen the stock one bend when it just should not have. If you insist on using the stock tube, make sure you have it centered as it does not bottom out evenly in the wings and you could have it offset to one side without knowing (until something fails).

With all the threads going it would be nice to see a master list....Maybe Skymaster should take BVM's leads and issue a series of AD's (airframe directives).

PaulD

Quote:
ORIGINAL: cgroen

A good friend of mine received a Viper the other day, he has waaaaay more building experience than I have, and are planning the following mods, which I will follow on mine also:

1) Change the pinhinges for the rudder to Robart stuff, and add 2 more (so a total of 5), and add blocks to support each hinge (as the hinge point is far out from the surface it is glued to)
2) Make some ''U'' shaped ply/carbon reinforcements for the landing gear (where the mount touches the upper skin, very weak)
3) Add triangle balsa (15x15 mm) in the aileron and flap openings in the wings, there is quite a distance from the ply inside the opening to the hinge line
4) Ditch the plastic horns delivered with the kit, we are doing our own ''heavy duty'' horns from 2.5mm carbon, using two on each surface with a 3mm ball link between them (the original ones goes only 5..6 mm into the surface, the new ones 12..15 mm)
5) Add a bead of epoxy in the front of the canopy (the curved fiber), it is too soft
6) The cockpit tubs from Skymaster are extremely brittle, will need reinforcements (mine was already broken several places when I received it at JetPower!)

I think that was what we have talked about so far, interested in other peoples list also !
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Old 10-07-2009, 01:47 AM
  #195
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Default RE: Another Skymaster Viper

Quote:
ORIGINAL: cgroen

A good friend of mine received a Viper the other day, he has waaaaay more building experience than I have, and are planning the following mods, which I will follow on mine also:

1) Change the pinhinges for the rudder to Robart stuff, and add 2 more (so a total of 5), and add blocks to support each hinge (as the hinge point is far out from the surface it is glued to)
2) Make some ''U'' shaped ply/carbon reinforcements for the landing gear (where the mount touches the upper skin, very weak)
3) Add triangle balsa (15x15 mm) in the aileron and flap openings in the wings, there is quite a distance from the ply inside the opening to the hinge line
4) Ditch the plastic horns delivered with the kit, we are doing our own ''heavy duty'' horns from 2.5mm carbon, using two on each surface with a 3mm ball link between them (the original ones goes only 5..6 mm into the surface, the new ones 12..15 mm)
5) Add a bead of epoxy in the front of the canopy (the curved fiber), it is too soft
6) The cockpit tubs from Skymaster are extremely brittle, will need reinforcements (mine was already broken several places when I received it at JetPower!)

I think that was what we have talked about so far, interested in other peoples list also !

Removed one of the main landing gear units. The gear mounts already have carbon fibre reinforcements in place. I will fit another carbon/ply sandwich upright U support in the middle of the existing flex plate,
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Old 10-07-2009, 01:48 AM
  #196
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Default RE: Another Skymaster Viper

I have edited my post above with some of the fixes
(jascat, that was exactly what I was trying to explain, I have edited the post above so it's more clear, hopefully, English is not my best [:@])
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Old 10-07-2009, 02:34 AM
  #197
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Default RE: Another Skymaster Viper

i have just asked a german company to make us a price for carbon rudderhorns
also the same ones in normal epoxy horns.
they suggested that everything over 1.5mm thickness (carbon) (2.5mm GFK) was overkill (when using dubro ball links - double horn system)
also i have looked at the landing gear support , looks ok to me.
reason for breaking that i can only see it happen due to poor filled oil and air in the oleo.
and a hard landing..
it happens also to flash-bandit that is not equiped with trailing links
we are doing special trailing struts for the Viper , we will mill a complete new set for it.
we got 4 vipers here to experiment on.
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Old 10-07-2009, 02:40 AM
  #198
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Default RE: Another Skymaster Viper

Sandor,
I'm sure some trailing link oleo's would be a nice fix !
(your oleo's have saved many of my landings the past years )
I will gladly test them for you, if they can handle my landings, everybody else should be ok
Agree on the carbon for the controlhorns, 1.5 mm is surely enough
Regarding the "upright U" for the landing gear, I don't know, it looks terrible weak, and there was at least one person here that had it brake, I don't think it would hurt to brace it ?
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Old 10-07-2009, 02:52 AM
  #199
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Default RE: Another Skymaster Viper


Quote:
ORIGINAL: cgroen

Sandor,
I'm sure some trailing link oleo's would be a nice fix !
(your oleo's have saved many of my landings the past years )
I will gladly test them for you, if they can handle my landings, everybody else should be ok
Agree on the carbon for the controlhorns, 1.5 mm is surely enough
Regarding the ''upright U'' for the landing gear, I don't know, it looks terrible weak, and there was at least one person here that had it brake, I don't think it would hurt to brace it ?

i guess once we are milling them we can just as well make a U-shaped carbon part to strenghten them..
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Old 10-07-2009, 10:28 AM
  #200
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Default RE: Another Skymaster Viper

I have now unpacked everything & made a start on the various mods. The quality of the kit is exceptional. The thing that lets it down are the scale cockpits. The tubs are very brittle. One of mine was broken when unpacked. This is a long known issue that Skymaster should have addressed. Surely it would not cost much to make the tubs out of a more flexible plastic.
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