Seagull Models extra 300s .75
 

just got this arf today starting on it tonight has anyone else built one yet

RE: Seagull Models extra 300s .75
 

I've had their 330S for a couple of years. As I recall the instructions where some what lacking. I also canned the fuel tank and went with my own. The wheel axels also needed to be replace. I find the short landing gear to be a problem on my landins since I'm a little older. But, Minor fupa's were easily patched and the plane still flies great. I have the O.S. 75 in mine. Oh yes, one more thought, I lost the canopy bolts right off. It's not a good idea to have steel on steel. The vibrations cause them to come loose.

RE: Seagull Models extra 300s .75
 

i have one with a ST90 2st up front. great plane.
look out for high speed stalls. and watch your speed on landing.
http://www.youtube.com/watch?v=2TyQ9P-Yjno
http://www.youtube.com/watch?v=Y8-1i6Y4zYI

RE: Seagull Models extra 300s .75
 

I truely enjoy flying this plane, It's a little hard to get good 3D out of it because of it's strip aeilerons but it will hover very well. I run an OS91FX and it doesn't lack for power.

RE: Seagull Models extra 300s .75
 

ok well i am now to the point where i am mounting my engine... I just cant figure out how to figure out how to cut the cowl so that the motor will fit

RE: Seagull Models extra 300s .75
 

One thing is sure !

Post pics of your progress! :D

GL with the build !

RE: Seagull Models extra 300s .75
 

I just finished mine. I used some thin clear plastic (like on the cover of a spiral bound report) with some blue painters tape. Tape it to the fuse and overlay it on the engine and mark the engine cutout with a Sharpie. Cut the clear plastic to the Sharpie line. Then take the engine off and mount the cowl and overlay it on the cowl and trace the cutout onto the cowl and cut it out with a Dremel disc and finish with a sanding drum. Repeat the procedure for the muffler.

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RE: Seagull Models extra 300s .75
 

I just finished mine. No real issues so far. One thing I did was go over all the joining areas in the fuselage and run a bead of epoxy. Mine seemed to not be glued together very well. It may have been just fine but I didn't see a lot of glue around the joints. I am powering mine with a GMS .76. I am going to maiden it using standard servo's but I am going to buy metal gear servo's ASAP. I fly off a grass field which is much too wet to fly off of right now. Will have to wait until the flying field dries out some. Also, I bought the Airtronics RDS8000 and the receiver that goes with it. This will be my 1st 2.4 bird. I have to say though, the 300S is a really nice looking aircraft, i just hope it flies as good as it looks. I currently fly a World Models Clipped Wing Cub, Senior Telemaster, two Kadet Seniorita's one of which is on floats, an Extreme Flight Vanquish and a GWS Formosa. This is kind of my move on up aerobatic airplane. I don't have much desire to fly 3D but would like to be able to fly good solid aerobatics. i also just purchased a Hobby Lobby F-86. My 1st EDF.
Woody Mosher

RE: Seagull Models extra 300s .75
 

To get a very close cowl fit. First take off the cyl head.Loosen all the bolts 1/4 turn at a time until they are all loose and remove the head, do not lose the head gasket. Get some card board like a file folder or construction paper. cut a piece about four or five inches long and two and a half inches wide . Tape it on the fuselage behind where the cowl will screw on and so it covers the cylinder. Take a sharpie pen and outline the cyl onto the paper. Trim out this hole so it fits the way you want it to over the cyl. Then slide your cowl on to where you will screw it on and trace the hole of your cyl onto the cowl. You can do this for anything that protrudes out side the cowl. (The same goes for finding where to drill holes for attaching the cowl.) Make sure before you cut to have the cowl positioned over your crankshaft so its even all the way around. Take your time measure three times cut once. It really helps if you have a dremel with a grinding point. After your cowl is fitting perfectly. Reinstall your cyl head. Make sure you torque it to the same value as what you removed. Tighten all bolts in small increments in a criss cross pattern. The biggest thing here is to make sure you don't over tighten one bolt more than another. Good luck and take your time.

RE: Seagull Models extra 300s .75
 

You can see ghoffman did it this way and it came out perfectly.Nice Job.

RE: Seagull Models extra 300s .75
 

I won mine at a club meeting raffle. Nice plane, I put an OS 1.08 in mine, I know tons of power but I had it. Had to put battery all the way in the back but it balanced with no extra lead. Used a Hayes 8oz tank instead of stock. I ordered a set of carbon gear that will be a little taller and a bit wider stance. I too have to wait for field to dry up, snow is all gone but too much rain lateley.

R/C Foolish

RE: Seagull Models extra 300s .75
 

Thank you! I did it without taking the head off as well! Billerica, MA is near Merrimack, NH, come on up when it dries out lets see how the 75 AX does versus the 1.08!

RE: Seagull Models extra 300s .75
 

I'm glad to see more postings on this plane. I thought I was the only one out there for a while. Keep those posts coming. When I maiden mine, I will certainly put a post in the thread about it so everybody keep in touch.
Woody

RE: Seagull Models extra 300s .75
 

AND some pics as well...

I think that the big problem that newly introduced companies have to deal with is the way they promote their ARF's.

If you don't provide some good pictures,
let someone review your ARF,
let the manual *escape* online and such things,

then how do you expect to sell ?

I've been in this position myself and i am right now ,
about the Blackhorse T-28 60 size and the Blackhorse P-36A Hawk...

But because there is very little knowledge available online about the P-36A,
i will stick with the T-28.

It's really shame on them...

Just my .02$

RE: Seagull Models extra 300s .75
 

Here are some more pics of mine. Since these were taken, I relocated the battery into the left wing. Also, I really like these MTI switches that have red, yellow, and green LED's that indicate the battery status. BTW, the reason the wheel pants are red is I dripped CA glue on them and ruined the finish so I had to paint them and I could not find turquoise paint that was close.
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RE: Seagull Models extra 300s .75
 

I installed my battery right where your receiver is installed. That is where it balances the CG out the best. Is the reason you wound installing your battery in the wing that the plane was not balancing laterally?
Woody

RE: Seagull Models extra 300s .75
 

Yes, exactly. The OS 75AX and muffler are to the right, so the battery in the wing compensates for that without adding weight.

RE: Seagull Models extra 300s .75
 

The os 75ax is too wide to fit in my factory mounts. did you move the mounts, get different ones?

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guess i should have done more investigating..... the motor mounts come loose and are free to move enough to let the motor fit into place....oh well, not my first mistake - and i'm sure it won't be my last....

RE: Seagull Models extra 300s .75
 

I am on the last stages of assembly on my 300s, but the low/high rates appear to be incorrect in the manual. What control surface dimensions/movements are working for you? Thanks!

RE: Seagull Models extra 300s .75
 

I finally maidened mine on Sunday. All went well, I had to trim it a little. I learned that I definitely need to keep the speed up, the tips can stall easily in a slow turn. Also, I was running it rich for break-in, and the whole bottom was coated in oil, so I might use a different silicone exhaust extension. I was flying it at a club with a small field and lots of trees, so I was taking it easy, but I just joined another club with a huge open field. It is a former sod farm. Now I have a 5000 feet long, very wide field, so all I have to look out for is the ground! The club has one unusual rule: No flying alone because it is an emergency runway for Manchester and Concord airports. Hopefully, I won't have to share the field with a full scale dead stick SWA 737!
<div><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Monaco">http://www.concordskyhawks.org/</p><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Monaco"></p><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Monaco; color: #1800ff"><span style="text-decoration: underline">http://maps.google.com/maps?f=q&amp;source=s_q&amp;hl=en&amp;geocode=&amp ;q=Concord,+NH&amp;sll=42.957004,-71.597603&amp;sspn=0.009454,0.021758&amp;ie=UTF8&a mp;hq=&amp;hnear=Concord,+Merrimack,+New+Hampshire &amp;ll=43.246141,-71.555929&amp;spn=0.018819,0.043516&amp;t=h&amp;z= 15</span></p></div>

RE: Seagull Models extra 300s .75
 

Hi all,
I was considering getting one of these, and I was just wondering, as far as supplies (glue, extensions, and so on) what exactly is required?
Thanks :D

RE: Seagull Models extra 300s .75
 

got mine a couple days ago, got it finished today, and broke in the engine!! can wait to fly it!!!

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I went out to break in my motor and I was taxing but the tail wheel is useless, it does nothing! i see it moving but the plane will not turn! is there any way to fix this!
thanks!

RE: Seagull Models extra 300s .75
 

Yes, when taxi-ing, use up elevator to plant the tail wheel.

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I was! is there any other way!

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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!!!!!

RE: Seagull Models extra 300s .75
 

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!

RE: Seagull Models extra 300s .75
 

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.

RE: Seagull Models extra 300s .75
 

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.

RE: Seagull Models extra 300s .75
 

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.

RE: Seagull Models extra 300s .75
 

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!

RE: Seagull Models extra 300s .75
 

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,

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Any pics available ?

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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

RE: Seagull Models extra 300s .75
 

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

RE: Seagull Models extra 300s .75
 

<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>

RE: Seagull Models extra 300s .75
 

Will you post us your progress ?

http://mustangcanada.com/forums/imag.../worthless.gif

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<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>

RE: Seagull Models extra 300s .75
 

sorry I actually dont have pic's