planefreak123

My Feedback: (5)

I was! is there any other way!

planefreak123

My Feedback: (5)

had my maiden flight!! all went well!! definitely keep the speed up haven't done any 3d with it yet, the control surfaces are a little small but it should hover!! im running a supertirge .61 and it is a beast, very nice verticals!!!! i was flying in a 15 mph crosswind so i didn't do a whole lot with it!! nice little plane flies well!!!!!

horn

I have had a problem with my Extra 300s "rolling sharply left" with power addition, such as upon taking off or completing a go around. Only have a Supertigre .61 so wouldn't think that there would be a special / large rolling torque or p-effect. Only means to avoid crashing is to insure adequate speed prior to taking off or going to full throttle (assume that a stall is close to imminent when having this problem). Has anyone else observed a "rolling left issue with this plane? What about adding some right thrust to the engine? Just an intermediate flyer who would like a more docile flying plane.... Thanks!

ghoffman

My Feedback: (3)

Oh heck yes! Mine did that exact thing last week, and it scared the crap out of me! You could add right thrust, which all of of my other planes have, or add a throttle-rudder mix. I just this afternoon did that (with Horizon Hobby's help), but how much is still a question. I figure I will have to try it and adjust as needed.

da Rock

Most of it is a technique thing. You're advancing the throttle too quickly. Here's the deal.

Extra's have tapered wings. Tapered wings stalls begin at the tips. (Wings that have no taper stall from the fuselage out.) When you're starting the takeoff of any airplane, the prop is flying way before the airplane does. The airplane's ability to resist the prop's torque, p-effect, and gyroscopic precession is a function of it's airspeed. It's ability to fight back is lowered the slower it's flying.

Advance the throttle fast and the prop does bad stuff. Do it when the airplane is already cruising along and you don't see anything much happen, because it can't happen. Do it when your airplane is just beginning the takeoff roll and you see something happen because the airframe is barely flying and gets overpowered by the prop. When your airplane has tapered wings, you're almost guaranteed to see something happen. There's less area out at the tips to fight back and hold the airplane level. The rudder is struggling to keep the plane from yawing, and the horizontal tail probably isn't going to help keep the sucker from pitching up or down or both.

When you're flying slowly, work the throttle slowly.

When you're flying a tapered wing model, do it slowly or plan to buy another plane soon. And you'd probably be better off with a wing that doesn't taper too if you can't bring yourself to handle the throttle better.

ghoffman

My Feedback: (3)

Well, I generally agree, but my smaller Park Zone Extra electric and my 78 inch EF Extra with a Syssa 30cc and pipe don't act like this. This seriously goes left under power. With a little RH rudder mix, I think it will be OK, but we shall see.

horn

Thanks for the reply posts. Although I regret hearing the same problem has been experienced by others (ghoffman), it's comforting to know that I am not alone! Da Rock's post is right on target for describing what I am experiencing with this plane. This is my first tail dragger, and I am finding out the hard way that it requires a different flying technique than I am used to (compared to my favorite plane - a Super Kaos). I now know that I should have searched out some instruction prior to soloing the Extra 300s....

After doing some measuring, it appears that the Extra has no built in side thrust. Therefore, as an experiment, I plan on placing washers to add a degree or two of right thrust. On the next calm day, I will then taxi and do some "near" takeoff runs to see if the left pull has improved. Results will dictate if further thrust angle adjustments are warranted.

Also interested to see how the throttle-rudder mixing works (ghoffman). What was the mix "program"? Will the plane now constantly "slip" while flying do to the mix? Please post your results!

planefreak123

My Feedback: (5)

mine has been dong that to, drives me crazy! scared the heck out of me, i almost thoght that i took a hit or that the wind was messing with it!
that same day i actually screwed up the landing gear pretty bad, anyone know where to buy a better one?
thanks,

Kostas1

Any pics available ?

ameyam

ghoffman,

though this comment may be a bit late but I had to say it. Terrific wiring job there...best one I have seen till date inside a model airplane

Ameyam

ghoffman

My Feedback: (3)

Thank you, I really appreciate it! I can't stand it looking i like a rat's nest.

Steam28

My Feedback: (2)

<div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">Jzrf6c,</span></div><div style="margin: 0in 0in 0pt"></div><div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">I am just getting started building this plane with an OS .75AX engine.</span></div><div style="margin: 0in 0in 0pt"></div><div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">I read that you used the OS .75 engine, did you have to use a lot of weight (how much and where) to balance the COG? </span></div><div style="margin: 0in 0in 0pt"></div><div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">If anyone else used this engine, please comment on what it took to get proper COG. I was thinking of upgrading to the Great Planes Adjustable Engine Mount .60-1.20 but it&rsquo;s double the weight vs. the factory mount. I read in some other review where they mentioned that the factory mount flexed a bit.</span></div><div style="margin: 0in 0in 0pt"></div><div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">Mount:</span></div><div style="margin: 0in 0in 0pt"><span style="font-size: 10pt"><font color="#800080">http://www3.towerhobbies.com/cgi-bin/wti0001p?&amp;I=LXJ773&amp;P=ML</font> </span></div><div style="margin: 0in 0in 0pt"></div><div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">Thanks.</span></div>

Kostas1

Will you post us your progress ?

Steam28

My Feedback: (2)

<div style="margin: 0in 0in 0pt">
Y<span style="color: black">es I will, but I don&rsquo;t plan to build this in one day but over several weeks as time permits. This will be is my first ARF build for this type of plane. I have many EDF jets from 64-90mm that I have built and modified. Thanks.</span></div>

planefreak123

My Feedback: (5)

sorry I actually dont have pic's

Steam28

My Feedback: (2)

<div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">Kostas1,</span></div><div style="margin: 0in 0in 0pt"></div><div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">You asked for some pictures of my build, some pictures of my progress and almost done, there are already some finished pictures in this thread therefore, no need to repost.</span></div><div style="margin: 0in 0in 0pt"></div><ul type="disc" style="margin-top: 0in"> <li style="margin: 0in 0in 0pt"><span style="font-size: 10pt">Upgraded hinges to nylon (yes, I know its overkill).</span> <li style="margin: 0in 0in 0pt"><span style="font-size: 10pt">Added flats to the wheel axles.</span> <li style="margin: 0in 0in 0pt"><span style="font-size: 10pt">Battery</span><span style="font-size: 10pt"> will sit upright on the blue Velcro near the servos. Using an OS .75 and will need to add some minor weight to the tail.</span>[/list]<div style="margin: 0in 0in 0pt"></div><div style="margin: 0in 0in 0pt"><span style="font-size: 10pt">Thanks.</span></div>

Steam28

My Feedback: (2)

<div style="margin: 0in 0in 0pt"><span style="color: #000000">My plane is done but can&rsquo;t fly it till Spring. I did upgrade the small 8oz factory fuel tank to an 11oz Hayes.

What is everyone using for control throws? Are you following the recommendations from the manual? I am concerned with the low rate setting for the Elevator at 3/16&rdquo; up - 3/16&rdquo; down according to the manual. That is not a lot of movement compared to other similar planes.</span></div><div style="margin: 0in 0in 0pt"><span style="color: #000000"></span></div><div style="margin: 0in 0in 0pt"><span style="color: #000000"><span style="font-size: 10pt">Thanks.</span></span></div>

charlie1960

This plane isnt designed for 3D, you wont need a lot of travel.
Its a very resposive plane, so i would recommend you stay with the smaller throws.
It will fly fast and it is very manuverable.
Watch out for the canopy/hatch to be vibrating in the front, making a drumming sound.
The cowl will vibrate a bit too.


I wouldnt go over 3/8 travel on the throws on the elevator to start.
You can always set up hi/lo throw rates, thats what i did. I didnt think the rates were
enough myself, but they are.

Watch for high speed stalls in sharp hard high speed turns. makes a really GREAT looking manuver.

Cpt Crash

My Feedback: (12)

Just helped Psyched get his Seagull Extra 300S up and running. He powered his with an OS Max .75 and it's waay overpowered with that engine. We flew it with a 14x8 and that's definitely too much prop. Still, I like the plane. Be ready with the rudder and throttle up gently as previous posters have mentioned, and this thing will jump off the ground quickly and easily. We used the factory CG setting and it works just fine. No need for lead; Psyched used a 5 cell battery behind the servo tray to balance it. The plane is a keeper; it pretty much stays where you put it and flies nicely. The landing was smooth and easy; didn't realize I was landing crosswind until I touched down. Throws were all set to factory settings except the elevator; I added just a bit more on low.

Steam28

My Feedback: (2)

<p class="MsoNormal" style="MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Cpt Crash,

</p></span></p><p class="MsoNormal" style="MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">

 </p></span></p><p class="MsoNormal" style="MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">I have 9 flights on her this season. It has the OS .75<span style="mso-spacerun: yes">  </span>and a 14X8 Master Airscrew K-series prop. It gets a lot of attention at the field as the prop sounds supersonic. Agree on the factory CG and my battery is just in front of the three servos, see picture in a previous post. I get about 7 minutes flight time with the upgraded <span style="COLOR: black">11oz Hayes fuel tank that’s because I am at full throttle 90% of the flight. The faster the better, it can never be too fast. Let me know if you try a different prop.</span>

</p></span></p>

Cpt Crash

My Feedback: (12)

Steam,

I checked your photos; we put the 5 cell NiMH battery in the bay behind the servos, up on the side of the fuse opposite the cylinder head. It came out spot on the factory CG that way, with no added lead. Our final weight was a bit over 7 lbs - what did you get for a finished weight? You're right; with the 14x8 K series, this thing is a rocket! Still, I'm impressed with the airplane: good manners, more than enough control authority, and it flies very light and easy on the sticks. Psyched is interested in being able to use more throttle and keeping the speed moderate rather than just blazing around; we'll try a 14x6 next. What tach readings are you getting on your OS Max .75 with that 14x8?

steel15172

I am getting ready to pull the trigger on an order for this plane. I have a Magnum 1.20 four stroke that was in a GP extra 300s that I crashed really bad and destroyed the airframe. I want another but dont have the build skills to buy the kit. This looks like the closest that will handle my motor. The sites all say that it will take a 4s nitro .70-1.20. I really like the looks of the kit and the price is great. Hope to post some build pics and progress on flight soon. Great feedback here.

KaP2011

My Feedback: (17)

In case anyone was interested, there is an actual plant in Vietnam.

<div><span class="yiv2014148267Apple-style-span" style="FONT-STYLE: normal"><u></u></span>Seagul Models Manufacturing and Trading Company ltd.,</div><div>Office address: 62/8 Ngo Tat To, Ward 19, Binh Thanh District - HCM City.</div><div id="yui_3_2_0_1_13451281208082068">Factory address: 12/101 A, Hamlet 4, Dong Thanh Hamlet, Le Van Khuong Street, Hoc Mon District , HCM City, Vietnam.

I just got my Extra 300 - 75 yesterday. I must say, when it comes to ARF's, I'm a real nit-picker, I'm always looking for the bad. And I always find it, either bad covering, bad glue joints, poor alignment, something is always wrong with every ARF I inspect.

Not this one. At least not yet, I've only done a short inspection as I un-packed the box. I mean there is always something wrong that is very visable right away. I am very immpressed with this one.

I have noticed that there are no assembly threads on this plane. I will not call it a "build" thread because I didn't build it. So if there are no objections I will just add my two cents to this thread. I will post photos as I go. I plan to start tonite. If anyone knows of any issues with this plane, please post so I can correct as I assemble.</div>

KaP2011

My Feedback: (17)

Come to think of it, I believe I will start a new thread. I don't want to hijack someone else's thread.

mike early

where's the thread?

I am thinking of buying this plane