Rebellion

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Hi Speed freaks! I need your advice on a fast plane for a Webra50 GT. Needs to do in excess of 100 mph. Since this is kind of a side project, quick building and cost are definitely factors. Also, the field I fly at most often is a short rough grass strip. GP Viper or Lanier Predator perhaps ? Your advice will be most appreciated !

Thanks,

Dave

Razor-RCU

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Yup, the Predator and Viper ARF's are affordable and can get you into the 120 range- another cheap quickee is the Sonic by Sportsman Aviation.

If wheels are optional the Webra would scoot on a Whiplash or Diamond Dust!

Lastly if you want jet looks to go with your speed the GP Patriot and Kangke F-20 will haul the mail with the Webra--

Rebellion

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Thanks! Gotta admit, that Kangke F-20 looks nice---, but I have another RC project that's gonna be eating up most of my spare $$$ for some time to come. Since they are both a bit cheaper, think I'll go with the Predator or Viper. Are there any pros/cons to the Viper and Predator or is it a " close your eyes and grab one " kinda thing ?

Advice most appreciated !

Dave

MustangAce

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My Kangke F-20 has the Webra 50GT in it.

Really moves.

Rebellion

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Nice ! Man those are good looking birds.

murphyj

Where can a guy get one of those Kangke's?

Razor-RCU

My Feedback: (50)

I would try a search for both the Viper and Predator.... I have not flown either one but there is a LOT of info. on here about both! They seem eerily familiar ---

You sure you don't wanna get a Patriot with some retracts?

MustangAce

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www.kangkeusa.com

Crazy4Flight

My Feedback: (540)

UK Magnum
http://www.modellbau-usa.com/
they sell it with or with out the UK50 and tuned pipe made by Webra.

hand launch belly-land

PeterC

Having flown both in pylon racing I prefer the Viper. It is slightly more stable and just seems to handle better plus they give you a nice aluminum motor mount. Whichever you buy check the kit out thoughly before you leave the shop. check for straightlness and quality of covering and any fiberglassing which has been factory done. When assembling be sure the stab is 0 - 0. Speed seems about the same for both. As was mentioned previously 120 mph should be fairly easy to attain. I would suggest a 9 X 8 APC prop. Revs shold be in the 16 - 18000 range. .
Peter

Rebellion

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Did the search, LOTS of info. The Viper it is. Will pick one up at the LHS this weekend. My field is about 300ft with 10-15ft trees at either end and quite rough. Retracts would be asking for it ! Question, would the Jett or Ultra Thrust muffler be worth it on this engine ?

bob27s

My Feedback: (19)

The Webra 50 responds very well to the jett-stream muffler. Might be a good investment.

When we use to race the Webra Q-500 .40 down with SEMPRA, using a Jett or nelson muffler became the standard.

PeterC

One thing about the Viper. When landing it has a long, low flat approach. It is a fairly clean design so if you have to dive to come in over the trees you just might find yourself going off the far end of the field. Maybe invest in a chainsaw?
Peter

daven

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I wouldn't try to land the plane with the engine running, it will never slow down. You will have best results dead sticking the plane.

Rebellion

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Thanks for the warning. I read the online build manual. I was just curious, instead of using a single aileron servo, how would it be to use two smaller, lets say HS85MG servos in the same place on the ailerons and set up " flaperons " ? At least it would add a bit of drag---

My flying field, pics taken from about the same place on the field.

angelrcdesign

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What size is your field. Looks big enoug.

Rebellion

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I'd say roughly 300-350 ft. of grass runway. The pics make it look larger than it is. Coming in a little hot makes it look much smaller than it is. The plane in the pic on the right is my Kavan Projeti. Astroflight 020 brushless turning an APC 4.75x4.75 at around 19,000rpm. It glides forever as well. Lost it ( literally ) when the antenna got shortened by the prop. Some hunters in the area found it and returned it to the club a couple of weeks later. Only damage was about half the antenna missing and a couple of small dings in the LE. Will take about 30 min to repair and get back flying. My first "speed " plane.

bob27s

My Feedback: (19)

You have pleanty of room there to land a quickiee 500. I've gotten in and out of much tighter/more confined spaces.

Most Q-500 aircraft, properly set up, can be slowed down nicely for landing. Most will land slower than the ultrastick shown there in the photo.

They do not necessarily need a long, flat approach. Definately not like a QM or old F-1 plane. If the plane is heavy or noseheavy, it may be difficult to slow down. But at racing weight (3.5 - 3.75 lbs) and properly trimmed you will be able to slow a viper down nicely. Slow it down before you get onto final. Use the base turn to control airspeed and decent..... and use the "rudder" to keep the nose down in the turn.

btw... landing with the engine running (sport engine) ... you can slow it down more. The airflow over the plane, and the "disk" area help quite a bit. Plus you can use your throttle management just as with any other aircraft. You just risk a prop on a nose-over. I had that fun-fly spot landing stuff nailed with my old scat cat

You can try the flapperons. Although with the size and placment of the ailerons, they may not be all that effective.

One suggestion...... if you are flying off a "rough" field, and just sport flying the plane most of the time...... utilize a pair of dave brown wheels instead of the racing wheels.

angelrcdesign

My Feedback: (40)

Well a football field is 300 feet or so.. 100 yd. Well try a jet, and the presure is on with in 65yd.
But any we learn and ajust to the field. And the club flys' evrything from a nelson on a viper to a electric 1/3 scale and jet. And yes we have some speed freaks here.. including my self.

How many time do they cut the grass?

Rebellion

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Bob, thanks for the tips. Obviously, I'm a rookie at the speed planes. It sounds like a quickie will make a great sport plane. Really looking forward to it. With my limited building time, will probably be spring before I get it ready[&o].

Angel, sounds like you guys really have it going on at your club. Our field gets mowed 2-3 times per month during the summer. No real problems yet, other than grass stains on the prop. BTW, that Rifle of yours is one NICE looking plane. Just wish I had the time to build one. I think you understand.

Again, thanks to all who have helped the "speed plane challenged ". Most appreciated.

Dave.

TripleDeucer

My Feedback: (129)

Dave, I have the predator and don't care for it too much because of the vee tail. My conventional tail birds all track better and turn better. Also, the Chinakote covering on the Predator sucks big time.

Mark