If your into 3-D, the higher wing config is better. If your into precision imac, low is much better. My Sig Extra 300XS is the low wing and it performs manuvers like it's on a rail... Try and torque roll it or harrier.... nu-uh! BUT! For precision flying, it right on the money. Mine has the FPE 2.4 gasser, and JR G500A Gyro, and DS8411s all around.

Thanks for the info on the wing configuration .

I'm right there with you on the Sig Extra, but I harrier land mine all the time. Check it out here...

http://www.caswellplating.com/restgal/other_projs.htm

...scroll down a little and you will see it. I am running a Brison 2.4 with a Bisson Pitts. It weighs in at a heafty 15# but it will tumble with the best of them. This was my first gasser too .

CJ

Here finally got some pics going, sorry about the quality took it, from the mobile phone.

As you can see in the pics the the da50, and the, reinforced wing bracket to support the wings instead of the flimsy bolt nut and self tapping screw that WM incorporated, the entire firewall has been run over with epoxy, and finally agev a coat of paint for added protection.

Going to cg the plane hopefully this week, came across this interesting article on another forumn

I qoute " For sure you need extra power to do a good hovering and other 3D maneuvers. Something like 1 to 1,4 kg/HP.
I see more details:
World Models reccomend a 1.6 engine like OS160; this engine is 0,95 kg weight.
The DA50 is 1,33 kg, so you will need to compensate the CG about 0,38 kg. Maybe you will need to add some weight in the tail. Zenoah is almost 2kg ! No way! To compensate about 1,1 kg will be crazy and you will increase a lot the wing load. ( Drop like a stone in this case, even if you compensate the CG).
With DA 50, and the plane around 7kg, you will have about 1,4 kg/HP, more than enough for a good 3D.
So, I think your best choice is the DA50 and do not forget to reinforce the plane for this powerfull engine.
I do not know if the hinges supplied in the kit are good enough and I reccomend some fiberglass reinforcement in the fire wall.
Also use good and strong servos.
Good luck and good flights "

Which should be nearly the same when I cg the plane this week.

[img][/img]

Looking good Shesha ! Keep the pics coming ! [8D]

CJ

Here are the final set of pics for her, completed.

She is weighing in at 7.5 KG, thats about 241 Oz , and about 16.53 pounds. I had to CG her with 90 grammes on either side of her tail, and no weight whatsoever on the wings. Total added weight to cg her was 180 Grammes at the tail.

She hangs nicely, though the tailservo mounts am a bit concerned about going to re-enforce them with epoxy just incase.

Also using a temporary choke lever, will mount a remote servo handle the choke.

Maiden flight scheduled on 3/2/2006.

[img][/img]

Shesha,

Do you think that if the rudder pull-pull setup you have was switched for a servo mounted in the tail would eliminate some of the "sticky" weights ?

CJ

It would lessen the weight required for sure, but you will need some weights in there, unless you going to find a servo to equal the weight out.

IMHO the added weight is not going to make much of an effect on the flight, ith a DA50 on there she will be fine.

Did a maiden on the Magic 3D today, running her an OS 46AX had to offset her nose weight by 180 grammes on the rear and thats a small plane, that os 46AX on there sure is heavy. But the wing load can easily handle it.

My rates are way off, and no expo whatsoever on there, it toke one millimeter of elev movement on the TX that resulted in a wall.

Will put her to something more workable.

Think the extra will require some expo in there as well as 3 rate modes.

Shesha,

Agreed on the tail servo. You have a good point...

With my Sig Extra, I had allot of expo for sure ! When I flew mine the first time, low rates would not allow me to rotate on take off ! I switched to high during the take off roll and eased back and off she went. The plane was a good distance away by then but I came out ok.

Hope your progress is going well...

CJ

Well no luck on the weekend to fly her, the wm300 extra spent her time in the garage doing checks and rechecks, came across a problem with excessive vibration from the engine being mounted to the firewall directly.

Close inspection yielded the following issues.

Fuel tank was not clamped down enough, so inserted foam and balsa blocks to support the tank in one position completely, as opposed to the stock tank mount. The amount of air bubbles that was generated previously directly related to the execessive vibration has stopped completely. Engine is running better.

The engine needles were rich, causing alot of mid range stutter, readjustments were necessary, which resulted in a smooth idle, will need to tach the engine this coming weekend.

Though the engine vibration is excessive, I believe the prop is out of balance and will require some sanding to balance things out, hopefully lessening the amount of vibration.

I would believe a monokote film placed on the one side of the prop, and prop to be aligned counter the direction of the crakshaft rotation would do the trick.

Will provide feedback shortly.

Yeah baby, the maiden was completed. the plane flew nicely and predicatbly, and man does it it fly on rails, I was flying in at least 20Km wind.

The plane did not need any trimming, dead stick landing was predictable. The CG of the weights are bang on. it just glided in.

Those wing bolts I posted worked perfectly.

I need to open the cowl a little on the down corner side since the muffler is rubbing.

The day ended with some DA50 issues, that am working on at the moment hopefully will fix her up before next weekend.

Will post video shortly.

Will a 1.2 be big enough for this plane just for normal flying? Right now I'm still flying trainers but I have the extra waiting for when I feel comfortable enough to get past all the 40 size planes. I have a 1.2 that is still in the box that I got for this plane, but I see everyone else is going with at least the 1.6. I won't be trying to do any harriers or anything like that for a long time, and I know if I do I'll need more, but until then?

JME65,

I think you are taking a "leap of faith" there...

Keep this in mind...with aerobats...you do not want to underpower these...especially with so little time on the sticks. I think you would better advised to get something that would be a true good second airplane and keep this nice plane in the box until a later time. Something like one of these would serve you better with that 1.20 (I am assuming it is a 2-stroke) :

Four * (60 or 1.20)
World Models Super Sports Senior (the 1.20 would work well here)
World Models Super Chipmunk
Sig Kadet 110
Kangke Cap 232 Sport
Goldberg Sr Falcon

Granted, you might only need a short time on one of these but I think you would have better success this route. Hopefully, one of these other guys will chime in as well.

Shesha...

Got that video yet ?

CJ

If I were coaching a guy beyond trainers, I'd want to see him move up to the Sig Somethin' Extra, or something else with full aerobatic potential, and see him learn the IMAC Basic maneuvers. Then I'd want to see him do the same with something in the 68--72" wingspan range, and put his 1.20 two-stroke on such a plane. There are plenty of good ARFs and kits in this range, including Extras, CAPs, Edges, Yaks... Truth be told, he should also be flying and crashing a few low investment stick and profile funflies in along with all this.

I think someone with a lot of experience could maybe coax loops and humpties out of the WMExtra with a well-tuned 1.40 two-stroke and a good exhaust set-up (piped & pumped), but a 160FX is a more realistic powerplant. There is nothing more pitiful than to go up into a half reverse cuban, do your half-roll, and then find you have no thrust and no momentum to carry you up the rest of the leg. I did that once, and once was enough.

Thanks, I appreciate it. I don't plan on flying it for probly at least one more year, so I have more than enough time to get what would be right for this plane, and that's what I want to do. I'm sure I can either get another plane for the 1.2, or maybe even sell it, but I kinda doubt the second, my wife probly thinks she doubts the first, hunh? LOL

You guy's think a O.S. 1.60 ringed would be decent, or would I be better off to go a little bigger? I know it's just each individuals opinions, but I want to know what you guys with experience think. No one around here has this plane or one close to it that I've seen so far. I'm sure once summer comes, I'll see quite a few more, but I dont think the extra. Whatever advice will be appreciated.

Sorry about all the posts, I just noticed that this thread was for the wm extra 300. Would the sig extra 300xs be about the same specs and sizes. If anybody knows for sure, let me know, otherwise, sorry for throwing that all in here.

Sig doesn't make a 330XS. They DO make a 300XS.

It's NOT the same size. The Sig is only 25% and 73" with 990sq.in of wing. It's also heavy at a listed 12-13 pounds.

The World Models 300S is 80" span with 1175sq.in of wing. It's 28%. It's light at 15-16 pounds.

jm I believe one other post member has a sig, the only thing that I found about this plane that could have made it a good investment as opposed to going left and right finding all the right upgrades, are the control hardware, they leave something to be desired, with the amount of surface this plane i wouldnt be surprised to have hardware failure at the very early stages of flying. You know the DA50 on her is really nice, and then again maybe for the uninitiated it would be something terrifying.

Honestly the color choice and the engine sounds just makes it look so real when flying. Enjoy every moment of it.

Okay am working on the video my friend shot this weekend, it's not even 30 seconds long, one deadstick landing in it, and the video footage leaves something to be desired, will shoot next weekend for a proper one.

It will be up in a few minutes

It's not even worth the effort it's really bad quality have to wait till next weekend. Sorry [&o]

I'm building the same plane with same engine...Can't wait to see your video

How about the video? Can't wait to see...I'm building the same plane

JH

I'll see if I can work on it tonight, I need to get the right computer cable to get of the sony dv cam, whats even worse my dell latitude laptop does not even have the IEEE port for the DV link, maybe it's time to invest into a mac ?[:-]

Shesha,

Capture the video with an analog connection if you don't have a Firewire (IEEE). Use the yellow video out on the camcorder to hook to your yellow notebook video in. That should at least get the video captured. It will not be as good of resolution, but it works.

CJ

RCshadow, no go I just about tried everything yesterday and today to get the damn minidv cam connected to the laptop it just wont work, am connecting it via the analog s-video port behind the laptop to an adaptor that splits into audio and video and s video, and nope it wont work, I thin this adaptor wont even work supposed to be for the laptop to tv.

I am going to pop to sony's warehouse tommorrow and see If I can locate an I link cable to usb or some other cable that will make this cam work. If all else fails am itching for an excuse to get a new cam this one needs to dust.

Will see tommorrow have my eyes set on the 1080i. Will see one way or another am going to get that vid online.

rcshadow just for you man i went out and bought the hatdware to link the dv cam to the usb port and my luck it wont work so waiting for this to work, it's somethign with the video card on my laptop thats not able to process the mpeg previews.

Your video will be online shortly.