going down

would a magnum 80 4 stroke fly this plane?

thanks

LuvBipes

My Feedback: (4)

Yes, but barely. Most guys go w/ 120s in this plane. One of my all-time favorites, by the way.

MinnFlyer

My Feedback: (4)

Yea, they are marginal at best with a 91 Surpass. I think an 80 would be disappointing.

phughes

I flew one with a supertiger 90, and a 14-6 Prop for a lont time! Great plane to learn aerobatics with (not 3d) with the combination described as I was just starting in aerobatics (prior to this airplane I had a Big Stick). The 90 2 stroke flew the airplane well . . .others had the 108 os, but there was much more weight, and the landings were a bit hotter.

Azcat59

Great airplane with a 120 two cycle....like Webra (I've had two and know of three or four others set up this way) with Pitts style mufflers. A Perry pump and the tank on the CG makes a really neat outfit.

Clair

RobertC

My Feedback: (157)

Azcat59, the "new" Webra 120's seem to have a pump built-in! I am debating between this and a YS (four-stroke) 120 on my CG Extra.

Any suggestions about what to change/beef-up for these larger engines? I have already replaced the balsa spar on the trailing-edge of the horizontal-stab with a spruce spar (and I plan to add a strip of CF also).

phughes

I think just making sure there is plenty of tri stock up front should sffice . . .it was well built in that respect if I remeber correctly. what gear are you going to use? The stock gear is pure junk!

RobertC

My Feedback: (157)

phughes, I agree that the stock gear is junk-- I found a set of CF gear from GraphTech (specially made for the CG Extra!). I do plan to add some extra support where the gear mounts to the fuselage and, yes, plenty of tri-stock on/near the firewall area.

Azcat59

Robert, apparently there is a newer Webra with a pump built-in, and it should be a jewel. I soft mounted both of mine, as did my buddies, with the Sullivan backplate soft mounts, the largest size. Takes a lot of vibration out of the airframe, which is easier on it and the radio, plus it quiets the noise down.

I think you have done more than enough with the strip of spruce and you might want to rethink adding carbon fiber too.

I think Stans fiberglass cowls are a necessary addition to this airplane, (wheel pants too), and I believe that he also sells a nice aluminum gear for the plane. The wire gear is worthless.

Clair

RobertC

My Feedback: (157)

Azcat, have you heard anything about this "new" Webra. Horizon (the distributor) shows that it is available, but I have yet to see it in the stores (local or mail-order). Would love to hear from somebody who has used one. Thanks for the soft-mount tip, I hadn't thought about that!

I am also lucky enough (??) to have one of the last runs of the "original" CG Extra kits that included the glass cowl and wheel-pants.

Azcat59

I don't know if the new pumped Webra is available yet or not....seems like I heard they would be sometime in April. You might call Horizon and find out. I expect it to be a very good engine.

Another option would be the ThunderTiger 120 with a Perry pump. It is actually about 127 displacement. Price, including the pump, would be about like the Webra with pump. I have two Webras and one TT in use at present, and the TT is strong.

Clair

RobertC

My Feedback: (157)

I have heard good things about the TT, just don't think that I have the skills (or the guts) to drill a hole in my brand-new engine to install the pump!

What about the weight of the TT? The reason that I was considering the Webra (before I found out about the new version w/ pump) is that it weighs about the same as an OS 1.08 (another popular choice for the Extra). Going with a bigger engine, I definitely want to keep the weight to a minimum.

greenboot

My Feedback: (1)

Gosh, I didn't realize how "old-fashioned" I am, thinking the 91 four stroke was plenty of power. Do you guys use a runway or just head straight up? OK, for hovering/3D you need the power, but for conventional aerobatics the smaller engine is plenty.

Tom

Azcat59

The TT 120 is already tapped for a pump line. Just unscrew the bolt that is in the backplate, and screw in the pump fitting.

The Webra weighs about 25 ounces without muffler, and the TT is about 26. A Pitts style muffler is generally lighter than the TT factory muffler.

An Ultimate with a YS 120 is in the range of being overpowered, but with the ASP or OS 108 it is just a very nice airplane. It will fly visually much like Patty Wagstaff with her Extra, or Shawn Tucker with his black bipe. You don't prop these engines so they scream like a 40.

Clair

going down

ok, i'm leaning towards this plane. however what is the kit like?

also, are landings fast or is this a sweet thing to land?

thanks

LuvBipes

My Feedback: (4)

This is one of the easiest scale aerobats to land. The mid wing setup and dual taper wing planform make it a very forgiving aircraft at low speeds.

Compared to a Cap or a Giles the Extra 300 is a an easier plane to fly. The kit is a strait forward build for anyone with a few kits under his/her belt.

RobertC

My Feedback: (157)

I can't say much about flying (yet) but I have also heard MANY positive things about how this plane flys (as always, keep it light!).

Having almost completed building the plane, I can say that it is pretty standard construction. No real complaints (my die-crunching was even pretty good-- luck of the draw, I guess). The instructions are minimal, but not lacking.

sledman

My Feedback: (2)

I disagree that the O.S. 91 Surpass is marginal. I have one on the Goldberg Extra, and I have NEARLY unlimited vertical. And that is at 3000' ASL. That is with an APC 14 x 4W prop. Performance wasn't that great with the 13.5 x 8 Graupner it came with. The prop made an astounding difference! It is plenty of engine, unless you want TOTALLY unlimited vertical performance. However, keep in mind, this is not a 3D airplane!