3D Viper 120cc ARF is HERE!!!!!

[Terryscustom]

Terry, question for you. I plan on running a push-pull rudder on my viper. Can you confirm that I'll mount my rudder servos in the servo slots on the fuse under the stabilizers? Almost under the stab tube.
Thanks,
Jeff
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Yup, I'll be doing mine soon, maybe not tomorrow but Thursday for sure. If you shine a light down there you'll see that there are plywood doublers behind the cutouts on both sides for the servo(s). You only need one good servo back there though......don't skimp, this rudder is nearly as big as most 40% planes!!!

 

[Jefflesh]

Cool. I will be putting 2 Hitec 7950's back there. I think they should be plenty strong enough.


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[Terryscustom]

Cool. I will be putting 2 Hitec 7950's back there. I think they should be plenty strong enough.
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Too much weight!!!! A single 7950 on HV is plenty good. ZERO need for two of those on a 35% plane. Two of those in the tail of a 40% plane is perfect but mostly due to the weight of the airframe that it is holding. You are flying 12lbs.+ less airplane.......just use one.

 

[Terryscustom]

Now that the carb arm is flipped, time for some throttle servos!!
Pretty straight forward here. I've found that 7/8" out on a 1" servo arm works extremely well for the travel in the (spektrum) transmitter to be at 100% in both directions.
Pretty simple, lay out geometry, carefully cut a hole, add some "beef" to the inside for servo screws to go into more wood. I make my push-rods from stainless 4-40 rod sleeved with carbon tubes. Install carbon tube with thick CA.
Fuel line run, I drill a hole in the engine box bottom the perfect size for the fuel line and then angle the drill bit towards the carb. Run the line thought. Later I will install some "goop" on this area to eliminate any chafing of the fuel line.

 

[Hoistguy]

 

[Spats]

Love it! I never thought of doing that. Thanks for that awesome tip dude I'm on it.

 

[Terryscustom]

Back to work a bit today! I finished installing my fuel system in both planes.

In one Greg decided to use the DA fuel dot and I have been switching to these from B&B specialties. I like the DA one, but some of the China one's either don't want to come out, or end up falling out banging on the outside of your plane during flight.

Fuel system pretty straight forward. Nice thing about the B&B one is there is no line that comes out from the fuse. I installed a half dozen of these in my planes this Fall / Winter so we'll find out through next year how I like them.

The cross member over the tank gets in the way of the vent line so the loop has to go wide. For the vent exit, I like to use a 1.5" piece of 1/8" brass tube. Zip tie the tube in the vent line, exit the plane and then install a 2" section of fuel line on the outside. That keeps the fuel during long downlines and snaps well outside the planehttp://www.GiantScaleNews.com/forums/images/smilies/198.gif

 

[Terryscustom]

Prepping for some wire installs. I like to cut the openings in the plane with a hobby knife but it's nice to heat the knife with a small torch. This melts the covering, keeps it from ripping and also keeps colors from separating. I used three new blades doing these two planes, best not to skimp.

Next I un-boxed the extension kit from flyboysrc. that includes traildragger 20g extensions, Tech Aero IBEC, wire safety keepers, foam wire holders and MPX connectors!!

Just by my choice, I like to have the wing wires fairly long to give plenty of slack inside the fuse. I added an extension to allow a little more room. With HV and split ailerons it was not critical to add an extension so I did not solder it in, I just plugged it and used heat shrink as a safety holder.

The flange mounted MPX plugs fit perfectly in the Pull-Pull servo holehttp://www.GiantScaleNews.com/forums/images/smilies/197.gifhttp://www.GiantScaleNews.com/forums/images/smilies/197.gifI like to put them there, but label them so when some dude at the field is talking to you while you assemble your plane you have a visual reference!!

Since I'm using a push-pull configuration I ran the 3x48" extensions to the rear of the plane. As a reference, I like to install the rudder servo on the same side of the fuse as the fuel dot. While you are fueling is a good time to take a quick look to make sure that elevator, rudder and aileron linkages all look good.

 

[Spats]

This is killing me to watch you That looks so cool. I am in the middle of that big Extra of mine getting re-covered and then I have to put a Yak together for someone. Meanwhile mine just sits in the box starring at me!!!

 

[Alky6]

Terry - where are you sourcing the servo screws from? I noticed the ones you used on the mpx connectors.
Thanks