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JET LEGEND VIPER BUILD THREAD

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Old 01-14-2013, 02:58 PM
  #351
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Default RE: JET LEGEND VIPER BUILD THREAD

only 28 oz for smoke which isnt much but i am dialing down the pump speed to extend the fluid... If I see it gets consumed too fast Ill just pull the 12 oz out and add a bigger second tank like a 24 oz..... the smoke fluid gets costly!
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Old 01-14-2013, 03:02 PM
  #352
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Default RE: JET LEGEND VIPER BUILD THREAD

No I mean the tanks that are designed for the smoke, the fitted tanks back there, how many oz are those?
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Old 01-15-2013, 02:43 AM
  #353
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Default RE: JET LEGEND VIPER BUILD THREAD

Hi
The JL moulded smoke tanks are 950ml or 31.6oz each
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Old 01-18-2013, 09:33 PM
  #354
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Default RE: JET LEGEND VIPER BUILD THREAD

Any tips for routing servo wires in the wings? NO real direct shot.
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Old 01-18-2013, 10:04 PM
  #355
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Default RE: JET LEGEND VIPER BUILD THREAD

I used a thin long piece of piano wire with a hook at the the end. Take it slow and you will get it through
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Old 01-21-2013, 07:14 AM
  #356
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Default RE: JET LEGEND VIPER BUILD THREAD

Greetings from sunny FL. first I want to thank you for the help on the location of the turbine valves.....Now I know there has been much talk on CG, I would like to ask, when you checked the CG, did you do it with wings on gear down and UAT full..... my Viper has the new CG mark on the side, what I'm reading is 35mm behind the spar tube is the best spot, any reply on the CG set up will be very helpfull...and yes I have gone from page 1 to 15, it's nice to get first hand info...the maiden is set for this coming weekend.

Thank you.

Rocky Kranz.
Navarre, FL.
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Old 01-21-2013, 08:23 AM
  #357
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Default RE: JET LEGEND VIPER BUILD THREAD

Hi Rocky
For the early flights I set the CG at a safe35mm from the "centre" of the wing tube with gear up as nose wheel retracts rearward, wings on and UAT dry.
Its safe to fly with the CG more rearward and mine has flown at 40-45mm back dry with no issues.
Its CGwill alterof course as its fueld up,my set upat the moment iswith one 1500ml tank at the front and two 950ml (JL Smoke tanks) to the rear

Just checked it on the bench and it is
Compleatly Dry37mm
UAT + 1/4 front tank 31mm (this is usaly how it is as it lands after 8-9 minuets)
Front tankonly full7mm
Full21mm

If you stay with the two std 1500cc tanks up front it will end up with the CG well in front of the wing tube full but it still flys OK. but not at its best

PS, Just checked the CG with my spare 1500ml tank filled and on top of myfitted front tank with my rear tanks empty and the CG is 22mm in front of the wing tube

Regards Mark
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Old 01-22-2013, 07:43 AM
  #358
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Default RE: JET LEGEND VIPER BUILD THREAD

Thank you, at this time with the two 1500cc tanks dry, uat all most full, wings on gear down, the CG is between 35 37mm behind the center of the spar, with the Jet Central rab. I can get 9+ min flight time and have 1/3 or a little less of go juice left, this was in the Boomer Elan, I should have about the same burn with the Viper, I believe I will be just a little nose heavy with the set up as it is, I can deal with a little nose heavy, don't like the tail heavy thing....during the maiden !

Thank you, for the information and weather depending this coming weekend we will give it a go.

Again thank you.

Rocky Kranz.
Navarre, FL.
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Old 01-22-2013, 07:22 PM
  #359
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Default RE: JET LEGEND VIPER BUILD THREAD

So jealous you can fly. It was -5F with winds today.
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Old 01-23-2013, 04:03 AM
  #360
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Default RE: JET LEGEND VIPER BUILD THREAD

Put your jet in the car and come visit anytime, we live in the North west part of FL. and we do have a short winter season, cool or cold mornings and then it warms up, I went thru flihgt training at Pensacola NAVY, we live about 20 miles from Pcola, also we get to fly on a Navy field, short runway, 5000x300' NSEW, I can even get down on it.

I know this is a build page so I better stop before someone gets up set.

Best to, all Viper guys.

Rocky
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Old 01-25-2013, 09:49 PM
  #361
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Default RE: JET LEGEND VIPER BUILD THREAD

Ok guys, been at this for over a week now. I cannot find a way to route the air lines from the gear. I can get some wire up under the wheel well cover, but it just hits the wing root with no where to go. I amnot sure if my former is missing a hole or not but can someone help me on how they managed to route the air lines?

I have the servo wires routed just fine.
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Old 01-25-2013, 09:54 PM
  #362
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Default RE: JET LEGEND VIPER BUILD THREAD

It goes back into the wing and then hooks around under the flap servo.

Hard to explain but if you are looking at the wing from the root to tip, the airline pushes toward the tip and then does a u turn under the flap servo.

Hope this helps
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Old 01-25-2013, 10:07 PM
  #363
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Default RE: JET LEGEND VIPER BUILD THREAD

Ok will give that a shot. Thanks.
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Old 01-27-2013, 07:35 AM
  #364
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Default RE: JET LEGEND VIPER BUILD THREAD

I just got my new Viper from Jeff Sewell (ZEDJETS) 2 hours ago. I had to put it together and have a look, it is very impressive the quality and finish is excellent.I went for the special offer deal Jeff has at the moment for a complete VIPER and a new MERLIN 100X @ £2799 that was too good an offer to miss.I was lucky in that the model was ordered without graphics on the wings it looks much better than others I have seen as the Font that jet legends use is not too pretty.(a bit like me!)I am not too happy with the location of the tanks being well in front of the C of G I am going to look into fitting some over the spar area.Just need to get some time now to start fitting it out. I paid £25 extra for cockpit set which was well worth it
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Old 01-27-2013, 02:22 PM
  #365
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Default RE: JET LEGEND VIPER BUILD THREAD

Looks great!!

Don't stress out about the fuel tanks. I've got mine in the factory supplied position and it flies just fine. All I did was move the C.G back 35mm from the centre of the spar. My flying buddy has utilised a set of the JL smoke tanks and is using them as the rear fuel tanks and just one single font tank. He hasn't flown it yet so will be interesting to see if it is any different from my setup but that is a good solution to getting a set of tanks that drop in at the rear of the spar.
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Old 01-27-2013, 02:48 PM
  #366
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Default RE: JET LEGEND VIPER BUILD THREAD

Like the color, didnt know it existed. Would of rather of had that!
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Old 01-27-2013, 03:33 PM
  #367
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Default RE: JET LEGEND VIPER BUILD THREAD

Hello guys,
I just used the smoke tanks and a 14oz on the front fot fuel! Im using a jetcentral cheetah!
The cg on 35mm back and it flied so well! I love it. My runway is 300ft long and got it down realy nice.
The only problem I had was the extention on the ailerons!

Thanks guys
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Old 01-27-2013, 03:59 PM
  #368
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Default RE: JET LEGEND VIPER BUILD THREAD

Rereading the thread it looks like the standard tank location is too much in front of the cofg especially as I will be mainly flying off a grass strip ,I am thinking of cutting out the intake moulding just in front of where it splits into two and fitting one 2,5 litre ish tank over the spar to distribute the weight a bit more evenly. Anybody think this will be a problem with intake to the turbine, I did this when I built a Habu 32 for a P20 and it did not seem to affect performance. I just removed the bifurcated bit.(that's not Swearing, lol),or maybe two tanks near the mounting rails as Mark V has done and a 1 litre tank over or very near the spar.Cheers Chris
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Old 01-27-2013, 04:06 PM
  #369
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Default RE: JET LEGEND VIPER BUILD THREAD

Why anyone wants to modify this jet in any way is beyond me, it flies perfectly as it was designed to.
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Old 01-27-2013, 04:10 PM
  #370
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Default RE: JET LEGEND VIPER BUILD THREAD

Try to land it with the original setup on 300ft!
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Old 01-27-2013, 04:12 PM
  #371
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Default RE: JET LEGEND VIPER BUILD THREAD

Chris,

I only fly off grass and it has no trouble getting into the air with the stock tanks and a P80se. I have used no flap and take off flap and it is fine either way using the stock tank setup.

The below vid is a no flap take off.

http://www.youtube.com/watch?v=fYxts6fzSAk

Bear in mind compared to these new smaller lighter engines my viper is heavier as I have the P80, solenoids, large edu etc and I don't have an issue with it.

Also try some crow, this really helps.
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Old 01-27-2013, 05:01 PM
  #372
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Default RE: JET LEGEND VIPER BUILD THREAD

Jeremy D , how much crow are you using? Have a viper showing up next month and will be putting a Kingtech K-100G in it with smoke and flying off of a 400 ft. Runway that is asphalt. All the guys in my club that have carf flashes use crow also and it really helps on landing.
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Old 01-27-2013, 05:07 PM
  #373
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Default RE: JET LEGEND VIPER BUILD THREAD

I've mixed in 15% up aileron. I'll go plug my wing in and measure it for you and reply back shortly with the actual movement in mm
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Old 01-27-2013, 05:21 PM
  #374
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Default RE: JET LEGEND VIPER BUILD THREAD

Okay works out that it is only about 3mm travel which isn't much but it does make a noticeable difference. I might try and up it to 5mm next time and see what that does
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Old 01-27-2013, 05:24 PM
  #375
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Default RE: JET LEGEND VIPER BUILD THREAD

Thanks Jeremy D
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