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Seagull Yak?

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Old 04-05-2012, 10:48 AM
  #1476
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Default RE: Seagull Yak?

Geeee, you were all right about the CG. I had to add dead weight to the nose. It is tail heavy
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Old 04-05-2012, 12:54 PM
  #1477
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Default RE: Seagull Yak?

O yeah...I put a heavy supertiger 25cc on mine and only had to add 3 oz tail weight..
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Old 04-05-2012, 03:53 PM
  #1478
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Default RE: Seagull Yak?

Hey Gary... yep, those Seagulls are nice builds but I could smell lots of trouble with keeping the gear on em without some beefing... but that is true of many arfs.

I'm still working on my scratch build project. Took a bunch of time away from it for spring chores, yard work, garden, etc. but do have the fuselage covered and a good bit of the details done to finish up the fuselage.

It has been the most fun of any project I've done for a very long time. I'm in hopes of course that it flies well enough to enjoy but of course know that a self designed plane is a turkey shoot that can go either way. The mystery in that strangely offers a component of exhilaration I've not felt before and its cool. I don't know if it is like gambling, or challenging ones own abilities or exactly what... it's hard to describe... but it is fun... at least to do once.
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Old 04-05-2012, 05:17 PM
  #1479
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Default RE: Seagull Yak?

Arlyn,
About you're scratch build ....that's great. I'm too impatient to do that but, may try it some winter. My attention span is not that long anymore. I used to build the "stick" kits back in the late 80's but, the ARFs have me spoiled. I wish you great luck with your bird. It's challenging enough to build one from plans but, a self-designed scratch build is a double challenge. One good thing about it; since you're the engineer you can change any darned thing you want any time you want.

Didn't get to go flying today. My grandson had a track meet this afternoon and my wife reminded me just before Istarted loading up to go to the field. It was a beautiful day to be outside so, Ienjoyed the great weather and got to watch my grandson throw a 12 lead ball about 35 feet (shotput).
I hope to go tomorrow if the weather cooperates. If not, I'll stay home and work on the GP Yak.

Garry
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Old 05-01-2012, 07:15 PM
  #1480
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Default RE: Seagull Yak?

anyone know if an OS BGX 1 3500 (35 cc glow engine) would be too much for this plane.

it can use an 18 x 8 prop, and it produxes 4 HP.

if it can be used, any suggestions for ailerons, rudder, elevator servos?
plastic ok, or should i use metal gears?
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Old 05-01-2012, 07:22 PM
  #1481
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Default RE: Seagull Yak?

Yep, too much engine. 2 stroke .90 or equivilent. It's a very nice plane but, too fragile to handle that much power.

RJ
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Old 05-01-2012, 07:41 PM
  #1482
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Default RE: Seagull Yak?

I have a Supertigre 25CC on mine with a 18x6 and its perfect. Had to add 4 oz tail weight. Would not go any bigger. Have 50 or so flights and nothing rattled loose yet. Did have a couple stock hinges break and changed them all to radio south 1/4 scale hinges.
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Old 05-02-2012, 03:08 AM
  #1483
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Default RE: Seagull Yak?

hello
thank you for replying. i noticed on reviews that people sat recommended engines, like a .90 would make plane tail heavy, and that a heavier engine is required. then on horizon hobby website, they recommend 2 cycle glow size 1.10 to 1.79,
a 1.79 would be 30 cc glow engine.
i also saw on rc universe where people are putting in rcgf, gas engines that are 32 cc 2 cycle and they claim they have no problems. the 32 cc rcgf engine pulls out 3.9 hp
the os bgx pulls out 4.0 hp

do you really believe putting in an os 35 cc glow is a bad idea?
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Old 05-02-2012, 10:40 AM
  #1484
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Default RE: Seagull Yak?

Ihad this bird with an RCGF 26cc engine. It pulled very well and, remarkably, blanced for me without adding any weight. It flies best with that combo with the CG exactly at the factory recommended point. I used two 2100mah 7.4 volt (2S) LIPOs with voltage regulator set for 6v each. One went to the ignition and the other to the receiver. Iused a switch for each battery and mounted the batteries as far aft as I could.

However, the vibration from the gas engine was starting to loosen the glue joints after just a few flights so, if you go this route make sure you reinforce the engine box and every thing else forward of the wing spar that you can reach. I didn't do that and it's more difficult after you have the plane assembled.

Many Seagull models don't come with built-in thrust angle so, you must adjust the angle of the motor yourself using washers behind the mounting bolts. Try one washer on the two top bolts and one on the bottom left. You'll have to adjust from there after you fly the plane and see which way she pulls in a vertical up line. Iwas using fairly thick washers to adjust for a hard pull to the left and back toward the canopy.

Istarted with a 17X8 Xoar or Zinger Pro prop but, changed to a 17X6 as I thought the 17x8 was too much torque. The 17X6 was turning better than 8k at full throttle but, Ilost the vertical performance Ineeded. This combo needs a 17X8 or 17X10 and you'll just have to deal with the torque issue. Maybe put a little rudder trim on one of your switches and hit just as you start your up-line.

I still think this airframe is too small for a 2.6 hp (26cc) engine but, it should work great with an RCGF 15 cc (2.1 hp). Try HK USAwarehouse and you'll find they are cheaper than most nitro engines for this bird. I've seen one fly on a DLE 20cc (2.5 hp)but, it's still too much HP.

I like gas engines much better than nitro but, you have to be careful of the airframes you choose to put them on if you want the plane to last.

I had to replace the fuselage and tail feathers on this bird due to a bad landings. I had a bad landing about a week ago and it not only ripped the gear out, it broke the motor box out too.

Good luck,
RJ

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Old 05-09-2012, 03:37 AM
  #1485
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Default RE: Seagull Yak?

reinforecements so far:


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Old 05-09-2012, 03:40 AM
  #1486
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Default RE: Seagull Yak?

I have a Supertigre 25CC on mine with a 18x6and its perfect. Had to add 4 oz tail weight.Would not go any bigger. Have 50 or so flights and nothing rattled loose yet. Did have a couple stock hinges break and changed them all to radio south 1/4 scale hinges.


did you have to do anything for thrust angle?
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Old 05-09-2012, 05:59 AM
  #1487
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Default RE: Seagull Yak?

Thrust angle is fine.
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Old 05-09-2012, 07:12 AM
  #1488
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Default RE: Seagull Yak?


Quote:
ORIGINAL: cshahrdar


did you have to do anything for thrust angle?
No.

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Old 05-09-2012, 07:13 AM
  #1489
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Default RE: Seagull Yak?

Yes. I added the equivalent of 3 #6 washers to give it right thrust.. I used a bigger diameter washer because the small one just pushed into the firewall. I tracks great.
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Old 05-12-2012, 07:50 PM
  #1490
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Default RE: Seagull Yak?

I have the same plane and like the picture of how you have the tank installed. What size tank and what brand is it? I can't find any thing that will fit in the space that your picture shows.
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Old 05-19-2012, 05:39 AM
  #1491
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Default RE: Seagull Yak?

just checked the CG
it is at 5 1/4 inch back from leading edge at root.
the plane weighs 13 pounds 8 ounces
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Old 05-19-2012, 04:45 PM
  #1492
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Default RE: Seagull Yak?

file://localhost/Users/cambizeshahrdar/Desktop/airplane%20rc/IMG_2078.JPG
file://localhost/Users/cambizeshahrdar/Desktop/airplane%20rc/IMG_2077.JPG
file://localhost/Users/cambizeshahrdar/Desktop/airplane%20rc/IMG_2076.JPG
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Old 05-20-2012, 12:25 PM
  #1493
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Default RE: Seagull Yak?

I jacked up my fuselage so ordered a new Yak. Anyone need a new set of wings?
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Old 05-21-2012, 12:11 AM
  #1494
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Default RE: Seagull Yak?


Cshahrdar if that weight is right itsnot good news, your yak isway to heavy. I suspectunless you arean experiencepilot you will have alot of trouble with this plane at that weight, it will have the wing loading of a war bird. Im not saying it wont fly, but you will need to keep the speed up all the time and will fly fat and heavy.

This plane should be between 9.5 and 10.5 pounds depending on engine fitted. My 72 " wing 30cc pilot yak is a good pound lighter than your 62" wing seagull yak!.
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Old 05-21-2012, 02:43 AM
  #1495
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Default RE: Seagull Yak?

thank you

i will lighten it

the wheels i have are 5 " dubro
thay weigh a good 1 pound


i will remove and put on the ones that came with kit.

i will reweigh and post the new weight.
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Old 05-21-2012, 04:50 AM
  #1496
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Default RE: Seagull Yak?

I cut the pilot out of mine then painted the inside of the clear plastic black. I think that knocked off 5 oz. Raydar is right. Mine is right at 10.5 Lbs and that is the most I would go.
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Old 05-21-2012, 09:43 AM
  #1497
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Default RE: Seagull Yak?

sitting down in my office at work, thinking about it

i had to add 1 pound weight in rear,
and the wheels, which are several inches anterior to CG point weigh one pound

so if the wheels i put on are under 4 ounces total,
i could probably get rid of the one pound weight in the rear

that may bring the plane weight down to 11.5 pounds or so

better than 13.5 pounds it is now.


once i get home, i will play with it and see what i get.
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Old 05-21-2012, 02:19 PM
  #1498
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Default RE: Seagull Yak?

hello,
i have changed out the wheels and removed the weights.

with 5" dubro wheels and weights in rear, planed weighed 13 pounds and 8 ounces.

after switching wheels and removing the weights: 11 pounds and 13 ounces


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Old 05-21-2012, 10:51 PM
  #1499
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Default RE: Seagull Yak?

It's still nearly 2 pounds heavier than mine,which weighed in at 9 Lbs 15 oz, with a Dle 20 and heavy shock absorbing mount. What is making yours so heavy?
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Old 05-22-2012, 02:57 AM
  #1500
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Default RE: Seagull Yak?

it is my engine
it is an OS BGX1
35 cc glow engine
it weighs:

47 ounces without mufffler

your engine weighs 28.9 ounces,
i do not know if this includes muffler, ignition, and battery pack?


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