ECalderon

Hi, I also fly ate 600 mt above sea level. My landing flap is about 65º-70º and I use about 5 mm crow with elevator mix (about 2 mm up elevator) only for landing flap. I have a Jet Central Cheetah 160. For landing, on upwind I lower the gear, when it is down I go to take off flap ,and once in downwind go to landing flaps between 1/4 and half throttle depending on wind. On final I keep the throttle at about 1/4 managing altitude with throttle so that it touches down a little past me. When I know I have reached the runway I go to Idle, usually at about 2 mt altitude. Some time we have a lot of wind and to bring it in throttle on final has to be more, it slows almost to a crawl with no bad habits.

Regards
Eduardo

Dave Wilshere

If you have 2mm UP mixed with flap you are running nose heavy.
The Viper’s huge tail hides this situation well, it’s why people have been flying this aeroplane nose heavy since it was designed.

Dave

Hans Hilmar

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Hi Guys,

Very helpful tread, thanks for that! Just a quick question, what size pilot will fit this plane?

Thanks,
Hans

Asif

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I have 1/4 scale pilot from warbirdpilots.com The pilot is 15" tall and fits just fine in my Viper.
https://www.warbirdpilots.com/Search...ilot-Red-White

Hans Hilmar

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Thank you so much!
BR. Hans

Dave Wilshere

Near 10 year old CARF Viper brought up to date. It was in quite a state when it came to me for a running issue. Cleaned and polished, new canopy, totally ripped out and re wired with Powerbox wire, Mercury fitted, changed to Core. Fuel system was rebuilt and turbine serviced at JetCat. Ready for another 10 years!

Dave Wilshere

Test flight done…does not look it’s age!

A7Bldr

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Dave, I bet by now you can test fly these "Blindfolded".
Jim

Bob_B

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Dave is that a 2m Viper Jet

Dave Wilshere

Jim

Yep…probably don’t even need to be on the airfield 🙂 Set up correctly they are just like flying a leather arm chair. The owner will be shocked when he next flies it as I moved around 12oz of batteries from the nose and put them by the fuel tank! It flies even better with a correct balance.

Bob, no CARF Viper’s are all 2.6m

damagedgoodes

Can anyone help with spar position in the wing please and how you routed the cable? I’d like to install Unilight nav/strobe units on the ends of the wings but I noticed the wing is sealed outboard of the aileron servo. I also want to make sure I’m either in front or behind the spar when I cut a slot in the wingtip. Any help would be appreciated.

Dave Wilshere

A7Bldr

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Love it when you skid around the corner with the rudder on the slow passes!

Dave Wilshere

There was a cross wind that day from memory, but slow turns with a jet is all about the rudder…it’s why so many run into trouble trying to fly slow, they just use aileron!

jvaliensi

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Do these photos help?
https://carf-models.com/en/products/viper-mk2

Afterburners

Wondering if anyone has or can take a pic of their Electron nose gear/servo/linkage setup? I pulled my ER-40's from a Carf Hawk and contacted Electron as to what needed to be changed for this Viper and received the parts. For the nose gear, all that Adrian from Electron said needed to be changed was the servo mount which is offset to lower the servo. Even with that I have to mount the servo from below the mount(not pass the servo body through the mount) for the servo arm and linkage to clear the fuse skin and it's still very close. Just curious if I'm missing something mechanically. Thanks.

Hans Hilmar

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Hi Guys,

Just need at little confirmation here to be sure I get this right, trying to use Daves method to balance my Viper. Does it sound correct that I will end up with batteries mounted approx. at back seat (Front part of Fuel tank) or I'm I way off here?
Flying now with batteries mounted next to front gear, plane flies fine but seems nose heavy when landing so want to move CG further back.

Thank you so much in advance.

Dave Wilshere

Hans

Yes, it depends on servos etc, but I have several friends with all three batteries on the fuel tank when using JR 8411’s in the tail.

Dave

Hans Hilmar

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Sweet! Thank you Dave..

Havilland

Hello everyone, I also built some cockpit components for the XXL Viper and also the XXL Viper from Skymaster.

jvaliensi

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Hi,
What servo torque is needed for the flaps and elevators? I imagine the flaps need more torque. I have some 355oz servos that I am thinking to use in the stab and 550oz for the flaps.

This airplane has been around a long time and servos have gotten much more powerful since then.
Thanks

Dave Wilshere

More than enough. Flaps the geometry is more important than torque

jvaliensi

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I started to build my Viper. Thanks to Elad for getting it so quickly -I ordered it on Monday and picked it up Friday. It took a little more than a week for the retracts, tank and pipe to come from Germany.
The factory photos of the Pioneer scheme do not represent how good it looks in real life. Actually, it was my least favorite scheme, until I got it. Two other fellows have the Cayman scheme and I needed something different.
It is amazing to me how perfect the paint lines line up. The parts are coming out of separate molds and are painted in the molds.
The pipe system is quite clever but can be improved by having more area to attached the turbine mounts. I had to graft on extensions for the rear bolts.
Apparently Inspector 14C left early the day they checked my model - as the wheel well cut-outs on the fuselage are absent. Ha, more fun for me.

The paint work is amazing.

See how the rear tabs are where there is no material to bolt to.

Added aluminum tabs to bolt to.

Where are the wheels supposed to go?

AMP Dynamic 3100 series connectors

Rudder wire connector.

Afterburners

I had to graft onto the rear mount as well for my Cheetah 140. Also when setting the recommended gap between the end of pipe and end of tail cone, the pre drilled rails with blind nuts doesn't come close to lining up with the engine/pipe assy. My fuse was cutout for the wheels though. It's all worth it as it flies great.

jvaliensi

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Hi,
Does the right and left flap servos go in the same way? So the servo arm points towards the bottom of the wing when the flaps are up.
My right wing went right together like that. On the left wing it appears the flap mounting rib is glued in the opposite way and the servo arm does not clear the wing. It does fit the opposite way either. I've never seen an airplane with flap servo linkages set up differently for each side.

Right wing works (top of wing is down in photo)

Left wing - no joy (top of wing is down in photo)