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Another Skymaster Viper

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Old 09-02-2009, 08:40 AM
  #151
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ORIGINAL: Eagle Driver

or we have a beer together on JP
Hmm.. even better!

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Old 09-05-2009, 05:39 AM
  #152
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Old 09-05-2009, 10:28 AM
  #153
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Vertical

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Old 09-05-2009, 10:41 AM
  #154
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Default RE: Another Skymaster Viper

Mine landed perfect without half a fin and no rudder.. try it a little nose heavy until you get used to it...
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Old 09-30-2009, 10:49 PM
  #155
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Default RE: Another Skymaster Viper

Well after lots of delays...work....life....my Viper is VERY close to being ready to fly. I had the help of a BVM rep today getting the first run on my P-160. VERY cool indeed. (my first jet)
While i dont have the cockpits fitted yet, Im wondering about the CG. I'm running two Duralite 4300mhr packs and a large pack for the engine. both the flight packs are up in the nose gear area and the engine pack is at the aft bulkhead of the nose gear area. (for now) I measured the required 220mm to 250mm Cg range. Being by myself, this was tricky, but it would appear as if im in need of about 28oz of weight in the nose. Seems like a lot to me... just under 2lbs... hear others are not using any weight...

Whats all of your experiance out there? (gear down, UAT full, ECU under the aft cockpit, 3 batteries up front) What has your experiance been with factory CG location?

Out doing shows the next two weeks, so no first flight until then, but will have time to button up the small items and get the plane balanced.

Look forward to the input.

regards,

Matt
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Old 10-01-2009, 12:09 AM
  #156
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Default RE: Another Skymaster Viper

I dont know my CG as i bought the jet used.. but i have two big NIMH batteries 330mah each in the nose and a 5400 lipo battery for turbine in the nose too..
The turbine is in the maximum front position.. touching the air intake..
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Old 10-01-2009, 06:36 AM
  #157
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Default RE: Another Skymaster Viper


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ORIGINAL: Matt Chapman


Whats all of your experiance out there? (gear down, UAT full, ECU under the aft cockpit, 3 batteries up front) What has your experiance been with factory CG location?

regards,

Matt
Matt,

28 ozs does not sound right. I have two 2300Mah A123's and a 10cell Nicad up front and mine balances right in the middle of the cg range. The cockpits and a pilot will definately help but not 28ozs worth. Because of the curved bottom of the Viper, it is difficult to place balance points and it is definately a two person job. I suspect your initial balance may have been off.

Craig
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Old 10-01-2009, 06:45 AM
  #158
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Default RE: Another Skymaster Viper

Matt, I heard from John B that you were getting close! My CG is exactly in-between where Anton recommends in the manual. All batteries are up front (2 - 5200 mA Li-ions and 1 - 2750 mA LiPo), gear down, UAT full, and all turbine related equipment is under the turtleneck just behind the cockpit. With this set up I needed to add 3 oz in the nose. Definitely fit the cockpit before doing final CG, this along with a pilot will make it nearly right without adding any additional weight. I made a stand to balance my larger planes without a helper, photo is attached. Set your elevator movement to 25mm, this is perfect for landing with minimal expo. The Viper will balloon on you with too much elevator and expo.

Did you do the mods that were recommended in the various build threads? Specifically the rudder? I also added additional glue to the windsheild as I had one come out in flight several months ago. Not the canopy but the windsheild.

Enjoy your Viperjet! Its a great flying jet.
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Old 10-03-2009, 02:02 AM
  #159
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Default RE: Another Skymaster Viper

A video of my ViperJet, complete with deadsstick landing at the GA Jets Super Jets South last week. Filmed by Jim in Kentucky (thanks Jim).

http://www.youtube.com/watch?v=bZoNtumTfIA

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Old 10-03-2009, 05:10 PM
  #160
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Default RE: Another Skymaster Viper

Very good video,congratulations.
Norbert
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Old 10-03-2009, 11:24 PM
  #161
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Default RE: Another Skymaster Viper

My latest little viper mod, and an oldie that is really worth making sure you do........
I found the canopy frame very flexible one the lower cross braces of fiberglass were removed. This made handling it when it was off the model tricky and after a few " Harder" flights ( Especially those with snap rolls ) I found the rear edge of the canopy frame starting to open out. I didnt deal with this quick enough and ended up with a tiny hair line crack in the very top of the frame where it had opened out more and more.
My fix was to put a cross brace in. What I used was a 3mm carbon push rod with a threaded adapter at both ends, with a clevis attached. This was I could adjust the length of the cross brace a little to get it just right. I then cynoed, and rocked powdered the very top domed part of two fiberglass servo arms into the corner of the frame as attachment points. Job done! The frame is allot stiffer now, nicer to handle when off the model and can not open up in flight.
The oldie to make sue you look out for is to make sure that you gently heat the flap faring attached to the flap surface which lips below the top surface of the wing, then while warm flew it gently so it rolls under more and clears the top skin of the wing. From the factory these tolerances are a little close and I have found in flight that with a little wing flex the flap can actually catch the wing as they raise. On more than one occasion I have had it where one flap has caught and not gone fully up. Causing the model to roll a small amount in flight, ruin that flight, stall the servo and damage the wing skin a little. A gentle warm with a heat gun ( Go easy as its thin glass in that area ) and a tweak down has it sorted.
Hope these mods are of some help
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Old 10-05-2009, 02:31 AM
  #162
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Default RE: Another Skymaster Viper

Ali,

Thanks for the mods. Could you please provide a photo for the canopy mod although your explanation is quite clear would like to see exact location of cross brace.

Thanks,
Best regards,
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Old 10-05-2009, 08:30 AM
  #163
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Default RE: Another Skymaster Viper

Not a very good photo I am afraid but it will hopefully give an idea, if not I will take another later on.

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Old 10-05-2009, 08:37 AM
  #164
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Default RE: Another Skymaster Viper

Thanks Ali,

I think i get the picture. Do you think that a carbon fiber layer with resin on the inner side of back former of canopy to stiffen it would do the work??

Thanks, Regards,
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Old 10-05-2009, 09:03 AM
  #165
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Default RE: Another Skymaster Viper

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.

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Old 10-05-2009, 09:13 AM
  #166
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Very interesting. What's the budget??

Regards,
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Old 10-05-2009, 10:27 AM
  #167
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Default RE: Another Skymaster Viper

The bags are great Ali, I got myself a set for my Viper at JP also (and when I saw the quality, I ordered a set for my Eurosport also )
Regarding the canopy brace Al, what have you done in the front of the canopy ?
There is a cross brace in fiberglass when the canopy is delivered, I looks like on your pictures that it is removed ?
I'm afraid that removing it will make the canopy blow of in flight ?
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Old 10-05-2009, 11:05 AM
  #168
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Default RE: Another Skymaster Viper

Hi Ali,

Thoese bags for the Viper looks super! where can I get a set?

I finished some new helo projects and now I am full throttle to get my Viper in the air!

Regards,

Gonzalo
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Old 10-05-2009, 11:09 AM
  #169
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Default RE: Another Skymaster Viper

Gonzalo Hi
I am selling these bags and have just last week sent a set to Rob Lynch in Florida.
Regards Al

Email me direct for costings jets@alshobbies.com

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Old 10-05-2009, 01:23 PM
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Default RE: Another Skymaster Viper


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ORIGINAL: jclittle

A video of my ViperJet, complete with deadsstick landing at the GA Jets Super Jets South last week. Filmed by Jim in Kentucky (thanks Jim).

http://www.youtube.com/watch?v=bZoNtumTfIA

jclittle,

Great video. I noticed that you're gears retract slowely (very realistic) what valve system are you using?

Thanks, Regards
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Old 10-05-2009, 01:44 PM
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Default RE: Another Skymaster Viper

Can anyone advise how slow can the Viperjet land?? What about the stall characteristics??is it safe to fly out of a 300 feet paved runway?

Although they might have nothing in common, how would you compare the Viperjet landing compared to a Boomerang XL landing.

Thanks for your input and experience.

Best regards,
Dany

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Old 10-05-2009, 03:05 PM
  #172
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Default RE: Another Skymaster Viper


Quote:
ORIGINAL: extra 300


Quote:
ORIGINAL: jclittle

A video of my ViperJet, complete with deadsstick landing at the GA Jets Super Jets South last week. Filmed by Jim in Kentucky (thanks Jim).

http://www.youtube.com/watch?v=bZoNtumTfIA

jclittle,

Great video. I noticed that you're gears retract slowely (very realistic) what valve system are you using?

Thanks, Regards
I'm out of town at the moment but I'm 99% sure its a UP3 valve.
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Old 10-05-2009, 05:07 PM
  #173
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Default RE: Another Skymaster Viper

Dany

I never see a Jet with better landing caracteristics than Viper.. with a P160 i use more or less 300 feet to take off, but i never push it to the limit, like giving 0% to full power in 1 second...
Go on with the viper.. you cant find better and so beautiful jet

"Thanks again Ali.. mine has 45 perfect flights in my hand"

regards

Heraldo, from Brasil
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Old 10-05-2009, 05:11 PM
  #174
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Default RE: Another Skymaster Viper


Quote:
ORIGINAL: extra 300

Can anyone advise how slow can the Viperjet land?? What about the stall characteristics??is it safe to fly out of a 300 feet paved runway?

Although they might have nothing in common, how would you compare the Viperjet landing compared to a Boomerang XL landing.

Thanks for your input and experience.

Best regards,
Dany

As others have said it lands very nice and easy, I personally would not fly it from a 300 foot runway as it does have a tendency to float. Our strip is 1000 feet and I use just over half most of the time.
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Old 10-06-2009, 01:29 AM
  #175
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Default RE: Another Skymaster Viper

Ali,
have you done somthing with a brace in the front of the canopy ?
There is a cross brace in fiberglass when the canopy is delivered, I looks like on your pictures that it is removed ?
I'm afraid that removing it will make the canopy blow of in flight ?
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