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Another Skymaster Viper

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Old 10-22-2010, 08:55 PM
  #1601
johnzqh
 
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Default RE: Another Skymaster Viper

Hi Rainer

Sorry for the trouble.We already checked out you got the wrong nose retract.We already asked our supplier Mr. Li Kai to send new nose retract.Please send your address and phone number information to us via e-mail.Meanwhile,please disassemble the current nose retract and sedn back to Mr. Li Kai.I sent Mr. Li's address to you.Please check your mail.

Best regards

John
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Old 10-23-2010, 01:27 PM
  #1602
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Default RE: Another Skymaster Viper

Rudder Question:

I know that some of you have supported the hinges with brass tubing, Duncan I believe. Take a look a what I'm thinking of and let me know what you think. The brass tube will be notched before being inserted into the fin. Also, do you think any square supports will be needed on the fin where the hinge point will go in ? Any suggestions/help will be fantastic.

Steve
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Old 10-23-2010, 04:58 PM
  #1603
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Default RE: Another Skymaster Viper

I have done that technique before with some warbirds having similar control surface geometry. It is a nice way to support the exposed part of the shaft that sticks out.

You can also use the Robart hinge point pockets to achieve the same effect, the advantage there is that the rudder surface is removable .. a nice bonus. But this is good thinking on your part...

See: [link=http://www.robart.com/store/control-hinges?page=1]http://www.robart.com/store/control-hinges?page=1[/link]

Dave
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Old 10-23-2010, 09:02 PM
  #1604
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Default RE: Another Skymaster Viper

Mine looked something like this and held up in all my flights.



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Old 10-23-2010, 10:09 PM
  #1605
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Default RE: Another Skymaster Viper

Looks like you put just a small flare at the end of the tube to get it a bit closer to the pivot point, great idea, just what I had in mind.

Steve
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Old 10-24-2010, 10:29 AM
  #1606
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Default RE: Another Skymaster Viper

Yes, worked very well.

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Old 10-24-2010, 01:58 PM
  #1607
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Default RE: Another Skymaster Viper

Steve, just square off one end as mentioned and they will be perfect. I roughed up the brass to give the hysol something to key into.

Cheers

Duncan
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Old 10-24-2010, 07:26 PM
  #1608
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Default RE: Another Skymaster Viper

Selleri, Duncan, thank you for the info on the hinges. Duncan, I used your idea on the ram's for the main gear doors, big difference. I now have very good mechanical advantage on the doors, I also did something similar on the nose gear door. I will post a few pics soon. Thanks again.

Steve
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Old 10-25-2010, 05:05 PM
  #1609
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Default RE: Another Skymaster Viper

Has anybody found that they had to relieve the underside of the wing skin so as to get a bit more aileron throw ? (down aileron)

Steve
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Old 10-25-2010, 08:33 PM
  #1610
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Default RE: Another Skymaster Viper

Steve check the counterbalance and the paint line(were the paint stops on the vipers) had minor conflicts there with mine but not on the wingskin.
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Old 11-02-2010, 11:02 AM
  #1611
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Default RE: Another Skymaster Viper

After losing my first large Viper to some electric power lines a while back, I got the offer of another unbuilt early version kit. Maidened it today. I had forgotten how relaxing it was to fly. I dialled in quarter inch of crow. It is amazing how slow it will land. Using a Wren 160. Dry weight is 39Lbs.
Must try to take better care of this one.
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Old 11-11-2010, 06:46 PM
  #1612
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Default RE: Another Skymaster Viper

I am just finishing setting up my large Viperejet and have run into a problem with the retracts.

When the wheel are down, the air pressure is very slowly decreasing, so there must be a small leak.
However when the wheels are in the up position, the air pressure drops very quickly, so there is quite a large leak.

Ideas please on how to find the leak/s and fix it, if it is in the cylinders on the wheels how do I stop them leaking?

Thanks

Ross
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Old 11-11-2010, 07:30 PM
  #1613
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Default RE: Another Skymaster Viper

Mate,

Take a pair of pinchers and bloke one airline at one point at a time. Obviously you only need to concentrate, either on the up or the down side of the system at a time. However, don't forget to check the filler line too. Once you've isolated the leaking component, you can then set out to solve the problem.

But, don't be surprised to find more than one leak.................

Cheers

Jan
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Old 11-11-2010, 08:13 PM
  #1614
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Default RE: Another Skymaster Viper

Jan,
Thanks for the comments, yes I have tried that it is in the up part of the left wing retract.
Now how do I fix the leak in that cylinder.

Thanks
Ross

Queensland, isn't that where NFL players like dogs????
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Old 11-11-2010, 11:06 PM
  #1615
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Default RE: Another Skymaster Viper

Mate,

If you know it is a cylinder that leak, just replace it.

Cheers

Jan
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Old 11-12-2010, 03:31 AM
  #1616
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Default RE: Another Skymaster Viper

The nose cylinder leaked on my viper. I used a syringe to put some BVM lube into the cylinder and worked it in and out for a while. It seemed to bed the o ring in and fixed the leak.

Duncan
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Old 11-12-2010, 08:16 AM
  #1617
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Default RE: Another Skymaster Viper

Same problem here. but as I don´t like pneumatics I simply got rid of of them and installed servos for actuating the gear doors. Pity this this was a pro version, with the pistons installed... oh fezes.


Enrique
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Old 11-12-2010, 10:54 AM
  #1618
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Default RE: Another Skymaster Viper

Quote:
ORIGINAL: erbroens

Same problem here. but as I don´t like pneumatics I simply got rid of of them and installed servos for actuating the gear doors. Pity this this was a pro version, with the pistons installed... oh fezes.


Enrique
I think it is the retract cylinder that is giving problems, not a gear door cylinder.
Solution is to inject some silicon grease into the cylinder, work it back & forth, then leave it overnight & if that doesn't work, strip down the cylinder, check the O ring for damage & replace it with a new one from a hydraulics shop.
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Old 11-12-2010, 11:26 AM
  #1619
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Default RE: Another Skymaster Viper

Ok, thanks.

I tried this already but even so two of three gear door cilinders didn´t worked as required and jammed the gear during the test.

It was faster to put the servos rather than waiting new pistons from China!

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Old 11-12-2010, 11:35 AM
  #1620
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Quote:
ORIGINAL: zl1wn

Jan,
Thanks for the comments, yes I have tried that it is in the up part of the left wing retract.
Now how do I fix the leak in that cylinder.

Thanks
Ross

Queensland, isn't that where NFL players like dogs????
My last answer was for your problem.
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Old 11-22-2010, 11:48 AM
  #1621
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Default RE: Another Skymaster Viper

Quick CG question: In the instructions it mentions 220mm-250mm from the leading edge at the root. 1st, Leading edge at the root I would assume is where the wing panel joins the fuselage, aft from that point? 2ed, what CG has everybody found that works well?

Thanks, Steve
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Old 11-22-2010, 05:05 PM
  #1622
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Default RE: Another Skymaster Viper

I've got it balanced on the wing-tube, nose slightly down.

(Easy to balance as well, just slide the wings off a bit and loop a string around the wingtube)
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Old 01-15-2011, 02:05 PM
  #1623
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Default RE: Another Skymaster Viper

Hey guys,

WHats the recommended CG for the SM big viper ? the manual calls for 220-250mm..

thanks.
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Old 01-16-2011, 06:18 AM
  #1624
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Default RE: Another Skymaster Viper

Im about to maiden my buddy's large SM viper with 160SX. throws are per the manual and CG at about 225mm.

Any special tips or do's and dont's for the maiden ?
Thanks.
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Old 01-16-2011, 06:58 AM
  #1625
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Default RE: Another Skymaster Viper

I'm pretty sure the aileron throws where on the low side as per the manual . Rudder needs increasing to 65mm each way as well.
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