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The World models Extra 330L 60 Size

Old 02-02-2006, 12:52 AM
  #1  
sal2006
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Default The World models Extra 330L 60 Size

Hi Guys,

I have just completed building this model. Have never built a better ARF, quality is outstanding. Now to the question.
I'm going to Maiden this on Saturday. If anyone has flown this plane or seen it fly, please let me know how it performs in the Air.Any bad tendencies? good ones? aerobatics..
I have installed an OS 91FX 2 stroke motor since it is the same weight as the 61.
I have a few pics to put up.
Enjoy
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Old 02-02-2006, 02:11 AM
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RV8NUT
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Default RE: The World models Extra 330L 60 Size

Hello,
I agree it is a fine quality ARF, one of the best I've seen. There are only a couple of things I would recommend.
1.Make sure you drop some thin CA around the alignment dowels in the wing root - my buddy nearly lost his when they worked loose during flight. Mine were OK, though.
2.Replace the metal allen bolts in the hatch cover with nylon 4-40 or equivalent bolts/blind nuts. The stock bolts will vibrate loose before you even reach the runway. If unable, at least cover the stock bolts with some very sticky tape!
3. I glued some Sig Manufacturing nylon bushings ( not sure if they're in Australia) into the fiberglass cowl to keep the attachment screws from wallowing out the holes, otherwise the holes will elongate after the very first flight. There are several methods for achieving this.

Otherwise, this is fine flying ARF - mine was way overpowered with a semi-reliable GMS 1.20 and Bisson Pitts.
Old 02-02-2006, 02:22 AM
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sal2006
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Default RE: The World models Extra 330L 60 Size

did it 3d well with that motor? What are landings like? Did you have the cg a tad nosew heavy?
What I have done with the cowl is drill holes and insert the yellow flex tubing into the fuselage, with thin CA.then the screws go into the tubing. It king of works like a drilled hole in the wall and inserting those green things.. with the Nylon bolts, can you give me a link to which ones I should get please? I also noticed the plane vibrates a fair bit, I mean I have checked everything, balanced all and vibrating still. Must be the structure of the plane.

Cheers and thanks for your help
Old 02-02-2006, 04:07 AM
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skoemba
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Default RE: The World models Extra 330L 60 Size

I have flown mine for the first time late last year. This is one sweet plane. I have an ASP 91 istalled and it takes off at half throttle. The only time I have flown it at full throttle was in vertical climbs. Glue in the dowels for the wings. I fixed my cowl the way it was called for in the manual and had no problems thus far. Nothing vibrated loose.

This being my first tail dragger sport plane, I struggled to get the landings nice. I also flew to slow downwind which robbed the elevator of all effect. Low stall = repairs.[:@]

If I had to do it again, I would get the same plane. I would only get some covering as "spare" as I am REALLY struggeling to get Toughlon here in Africa.
Old 02-02-2006, 07:47 AM
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Default RE: The World models Extra 330L 60 Size

For loose hardware (screws and such) I use Blue (or Red) Loctite thread locker. Works like a champ !

CJ
Old 02-03-2006, 04:55 AM
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sal2006
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Default RE: The World models Extra 330L 60 Size

what is landing like on this plane????
Old 02-04-2006, 02:24 AM
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sal2006
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Default RE: The World models Extra 330L 60 Size

okay didn't get to maiden today....We had some working Bee because we are extending our field which is great anyway.anyone else seen this plane fly??
Old 02-04-2006, 01:52 PM
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akaram
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Default RE: The World models Extra 330L 60 Size

Guys, I just got the same World Models Extra and ordered an OS 91 FX for it. Now I have a few things that I cant make up my mind on.
Should I use the stock muffler or a pitts muffler will be OK , I personally would like to use a Pitts like the slimline or bisson it should sound and look nice but many say they have problems ! what are their problems ???
Is the included 380cc fuel tank OK with the 91 FX or should I use a larger tank ??? how many minutes should I get with the 380 cc ?
I ordered for it the JR DS8421 digital servos (11 kg-cm torque, o.19 seconds/60 ), some have laughed at me saying it is overkill to use these servos on this plane ??? what do you think ??? Also some recommended mounting 2 mini servos in the tail for the elevator instead of the stock setup, what do you think ???
Old 02-05-2006, 02:09 AM
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Default RE: The World models Extra 330L 60 Size

I mounted dual elevator servos in mine - please see my post in the the other WM Extra thread. Running late for work.....
Old 02-05-2006, 03:35 AM
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sal2006
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Default RE: The World models Extra 330L 60 Size

Okay,

Maiden flight today....What more can I say. This plane is unbelievable. I did a few curcuits and then started going wild after I knew it was flying well, after trimming ETC.
I pulled the quickest snaprolls on low rates, I did Spins, stall turns, inverted flight, loops Knife Edges... AL shalloms LOL or whatever you call them....was absolutely nuts. Lands like a dream if you slow down early enough.. Make sure you put about 15% positive expo on elevator and ailerons, because it snapped on me twice. I would say this is due to the huge control surfaces. Expo will fix this issue. Only complaint is I had the plane sitting in the pitts and the plastic melted inside the canopy where the pilot sits. I have emailed world models and have demanded a new one of these. It was in the pitts for like half an hour....So make sure you keep the plane in the shade.The OS 91FX IS FINE FOE THIS PLANE, BUT USE A 13X6 OR 13X7 PROP.
I haven't mounted dual servos, but might eventually, I just used epoxy in the connection centre of the elevator pushrod. That won't be moving anywhere
I used the standard muffler and had to cut out only a little from the bottom of the cowl.
All in all this plane is brilliant. You don't need digital servos....LOL I am using Hitec 425BB which is more than adequate for this plane. Fuel on the standard 350cc tank full throttle all the way lasts no more than 9 minutes. So a bigger one would be better.
Have fun with this plane boys.... 9.5/10
Old 02-05-2006, 07:07 AM
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Default RE: The World models Extra 330L 60 Size

Thanks Sal, Great info ! What did u mean by the 90 is fine, is it that a larger engine would have been better or it is powerful enough ?
you said to use a 13x6 or 13x7 prop while in the manual of the 91fx ring they recommend the following props.

for sport : 15x8, 16x6-8, 17x6 Aerobatic: 13x11-13, 14x10-11

why is that ? What about vertical performance ? do you think it is possible to hover this plane ?
Old 02-05-2006, 06:04 PM
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sal2006
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Default RE: The World models Extra 330L 60 Size

Hey There,

I see you are from Beiruit, So is my Dad heheheheheheh, Live in Australia though.
Anyway, the 91 is powerful enough for vertical performance. Almost unlimited. I know the manual claims to use those props you mentioned, but the plane will fly to slow. I used a 14x8 prop and it had torque, but no speed at all, rpm's were really low, doesn't give the engine the offloading it needs. A 13x7 is perfect.
Man is you want to speak to me, you can add me on MSN messenger. Hovering will work if you go for a lower pitched prop, so if you went a 14x5 or something, it would hover really nice. I'd say a 13x5 but the motor wouldn't like it. It will over rev.
[email protected] is my messenger address.

I can talk to you more about the plane.
Old 03-27-2006, 04:04 AM
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Chibers
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Default RE: The World models Extra 330L 60 Size

Hey Sal2006,

I'm putting together the same plane and have read your thread and noticed that you're using an FX .91 2 stroke in your bird. I bought the FS .91 4 stroke for mine and I'm wondering if that's going to be enough power? Do you think I should trade it in for the FX?

Zahi
Old 03-27-2006, 01:55 PM
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akaram
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Default RE: The World models Extra 330L 60 Size

Hi Zahi,

91 FS Specs:

Power Output: 1.6 BHP at 11,000 RPM
Practical RPM Range: 2,000 - 12,000 RPM
Weight-With Muffler: 24.2oz (686g)
Weight-Without Muffler: 22.6oz (641g)

91 FX Specs:

Displacement: 14.95cc (0.912 cu in)
RPM range: 2,000 - 16,000
Bore: 27.7mm (1.090")
Stroke: 24.8mm (0.976")
Compression Ratio: 10.1 : 1
Weight: 550g (19.42oz) 24.3 oz w/muffler
Horsepower: 2.8 BHP at 15,000 RPM

As you see the power of the FX is almost double than that of the FS and the FS is also heavier by 100 grams. I just finished assembling mine and it is just a bit nose heavy with the FX, with the FS you will have to add some tail weight and also dont expect any spectacular performance with it, you can just cruise at low speed (you will have to use a big prop), for me it is boring. even if you get the 120 4-stroke it is only 1.9 HP. the only nice thing about 4-strokes is their sound , other than that get the 91 fx. I put a pitts slimline muffler on mine, it should give a nice sound. btw where r u from originally ? where did u get the engine and extra from ? model center on airport road ?
Old 03-27-2006, 04:50 PM
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Default RE: The World models Extra 330L 60 Size

"horsepower" figures are not the best to judge by. The balance issue is important though. What is the approx weight of that plane???

Ernie
Old 03-27-2006, 10:17 PM
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akaram
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Default RE: The World models Extra 330L 60 Size

By the I just noticed that weight with muffler for both engines approximately the same, 24.2 and 24.3 oz so the balance shouldnt be an issue. Flying weight of the plane is 4.7 kg
Old 03-28-2006, 06:35 AM
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Default RE: The World models Extra 330L 60 Size

Hi Akram,

This morning after reading your reply, I went on the simulator (G3) and tried switching the engines on a similar size CAP232 between the 91 4 stroke the 91 2 stroke and the 120 4 stroke and the performance was significantly improved with the the 91 2 stroke and 120 4 stroke.

So I just went and exchanged my 91 FS for a 91 FX. I also looked at the 120 FS III but it was $200 more than the 91 FX, so instead I got the 91 FX and bought a pitts slimline muffler for it ($76) much better deal.

I got all of it from the Hobby Center on airport road. They have a very large selection but the service could be better.

BTW I'm also from Beirut but I live in Dubai. Let me know how your maiden flight goes. I think it will be a few more days before mine is ready.

Zahi
Old 03-28-2006, 07:04 AM
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Default RE: The World models Extra 330L 60 Size

ZAhi, you did the right thing by getting the FX as the 4 strokes fly like sh*t, only good for slow flyers for senior citizens make sure you got the large volume slimline pitts #6016 specially made for the 91fx otherwise you will have engine problems.
The service of these guys is really sh*tty at hobby center, they serve you like they are smelling sh*t and dont give a sh*t about their customers anyways we buy everything directly from the States or Japan here. If you come to beirut give us a visit at Dr. Bourgi's Airfield in Amaz. Next monday or tuesday u can check out my extra on www.amazrc.com
Old 03-28-2006, 08:14 AM
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Default RE: The World models Extra 330L 60 Size

Akram,

Yes, I got the lg vol pitts muffler #6016 so it should be fine. I look forward to seeing pics of your extra.

Zahi
Old 03-31-2006, 01:25 PM
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Default RE: The World models Extra 330L 60 Size

Akram,

i need your help with the throttle linkage. I have mounted the engine sideways to exit the pitts mufflers straight down, but the throttle linkage is now too high for the pre-installed throttle servo tray. How did you get around this with your FX.91?

Thanks in advance,

Zahi
Old 03-31-2006, 03:56 PM
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Default RE: The World models Extra 330L 60 Size

Well, I noticed that it will be hard to install the throttle linkage from the preinstalled servo position thats why I installed the throttle servo inside the cowling on the right wall of the fuel tank box on its outside. I used a mini servo hitec hs225mg but any standard servo will do the job as there is enough space. I cut 2 small squares of hardwood and epoxied them to this wall to use as servo mounts.
Old 03-31-2006, 04:18 PM
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Default RE: The World models Extra 330L 60 Size


I posted some pics in my gallery, dont know how to display them here, one of them shows the position of the throttle servo.

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Old 04-01-2006, 12:39 PM
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Default RE: The World models Extra 330L 60 Size

Visit Radar (World Models) in Hong Kong regularly and they have one of these with the new Zenoah G200, gas engine with electronic ignition. Aparantely flies really well, engine should be available sometime this spring - could be an interesting combo?
Old 04-01-2006, 06:19 PM
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Default RE: The World models Extra 330L 60 Size

Drewbags,

I think this is the 30% WM Extra you are talking about, the one we are discussing here is .90 cu.in. size.
Old 04-02-2006, 06:02 AM
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Default RE: The World models Extra 330L 60 Size

AKram,


Good idea with the servo position, that would also shorten the linkage for faster response.Thanks for the tip. great looking plane, I'm just not crazy about the included WWI pilot, I'm gonna have to find a more modern looking figure.

Let me know how she flies...

Zahi

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