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Seagull Yak?

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Old 02-17-2012, 06:19 PM
  #1451
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Quote:
ORIGINAL: navypoe1

CF gear and it dropped 4 5/8 oz. Not bad. $34 delivered and it fits perfect and looks great.
That's an impressive weight reduction. I have a set of stock gear that weighs 7.3 oz. Reduction of 4.625 oz leaves 2.675 oz as weight of the CF gear. I'de like to know how they hold up, it may be good to go that route if they work.

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Old 02-18-2012, 08:38 PM
  #1452
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Default RE: Seagull Yak?

Opps....I forgot I had a aluminum plate with thestock gear just to help since it was a 2 piece gear. It weighed 7/8 oz. I counted that 7/8 oz as the total weight loss.
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Old 02-19-2012, 03:46 PM
  #1453
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I'd like a CF wing tube as well, but haven't seen any mention of such. Anyone know of a good source for the larger hollow CF tubes?

Two more flights on mine today and seems well sorted out now. Mine balanced nicely after I ejected the pilot and I'm quite happy with vertical performanceusing thethe Saito 125.
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Old 02-19-2012, 08:37 PM
  #1454
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Default RE: Seagull Yak?

jknox,

happychoice2009 is a good ebay seller for CF products or www.cfpart.com is their website. I am looking into the CF wingtube. I also got rid of the pilot myself and think it dropped a little over 4 oz. I have almost 2 gallons flight time on mine and i am in love with the Yak. I am trying to drop more weight cause I am using a Supertigre 2000/25cc and had to add 5 oz tail weight.
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Old 02-19-2012, 09:01 PM
  #1455
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ok jknox,

You got me thinking and i started measuring. I come up with 19mm O.D. and 17mm I.D. would be the correct size for a carbon fiber wing tube. I did it with my dial calipers but had to convert inches to mm's. So my numbers are a little weird like i actually came up with 19.1 mm's but that could just be +/- error of my calipers. Any one else out there buy a CF wing tube for this? Maybe you could do some measuring and we could compare.
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Old 02-19-2012, 09:25 PM
  #1456
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Well,

      the stock tube only weighs 3 7/8 oz so how much we really gonna save with the CF?
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Old 02-20-2012, 04:11 AM
  #1457
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I'd have thought it was more than that - Can't really justify the expense for a ~2 oz savings.
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Old 02-20-2012, 10:23 AM
  #1458
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Yeah,  I thought the wing tube would weigh atleast 6 to 8 oz.
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Old 02-20-2012, 10:26 AM
  #1459
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Yeah,  I thought the wing tube would weigh atleast 6 to 8 oz.
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Old 02-20-2012, 10:30 AM
  #1460
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Think about how much you'll gain in strength.

RJ
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Old 02-20-2012, 12:38 PM
  #1461
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Default RE: Seagull Yak?

There's at least one person I remember in this thread or one of the other two threads regarding this plane that has bent the tube with aggressive flying. I doubt I'd ever have that problem though, but I wouldn't mind spending say $15 - $20 for the upgrade. I'm definitely looking into the CF LG. I'd also check into a CF tailwheel strut if mine wasn't already balanced.
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Old 03-05-2012, 09:37 PM
  #1462
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I finally got around to ordering the parts Ineed to rebuild my Yak. They should be here by the end of the week.
I plan to order the new engine when the parts arrive and have the airframe ready for engine installtion by the time it arrives.
I plan to install a DLE20cc this time. I've seen this bird fly with one and it appears to have more power and will be more reliable.
Hopefully, I'll have it flying in a couple of weeks.

RJ
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Old 03-06-2012, 06:02 PM
  #1463
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Finished putting together my Yak:

DLE 20
Dubro shock absorbing mount
JR digital servos
8oz fuel tank under wing tube
2000 mah battery for receiver 6 volt
1400 mah battery for ignition 4.8 volt
All up weight 9 lbs 15 oz
2.5 oz weight up front to balance on the center of the wing tube. I may remove this weight after first flight.
Receiver battery installed just aft of the rudder servo. Ignition battery forward against the bulkhead where the fuel tank is supposed to go.

Haven't run the engine yet. This is my first gas engine. Will probably wait for some really nice weather to fly her for the first time.
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Old 03-06-2012, 06:06 PM
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Old 03-06-2012, 06:08 PM
  #1465
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Old 03-06-2012, 06:20 PM
  #1466
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Default RE: Seagull Yak?

Dash008,
     Looking very good.  You're going to like the way it flies.

RJ

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Old 03-06-2012, 07:04 PM
  #1467
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Yeah...Looks great! I am a nitro guy so i guess these gas engines get good milage. 8 oz tank? Like rowdy said you will love the way it flies. I can not even explain how much I love mine.
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Old 03-06-2012, 09:33 PM
  #1468
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Yep, the gas birds really "sip" the fuel. 8oz should give him close to 10 min. but, I wouldn't push it until I've tested it.
Time the flights and check the fuel level after each flight. It will use more fuel until it's broken-in and that will take a couple of gallons to do it right. After that the oil mix can be leaned and the carb adjusted to reduce or eliiminate the 4 stroking and it will start getting great mileage.
I love my gassers ...much less muss and fuss and, after break-in, you'll wiping dust off of it instead of that expensive nitro fuel.

RJ
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Old 03-10-2012, 07:27 PM
  #1469
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Yeeee Haawwww !!! Parts to rebuild my Yak arrived yesterday. I've removed all of the parts from the wrecked fuselage and am ready to start assembly. I ordered a new engine yesterday and it should be here by Friday, 3/16. HKhad a 26cc RCG engine on sale for $127 at the US warehouse. With shipping, it's $40 cheaper than the 20cc and $115 cheaper than a DLE. Just too good not to grab.
I've seen a YouTube video of this bird with the same engine and it flies very, very well. Didn't see a close-up of the installation but, it should fit fine.

RJ
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Old 03-10-2012, 08:52 PM
  #1470
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Default RE: Seagull Yak?

The Seagull Yak are pretty light built, watch for vibration shaking something  a loose! How about the landing gear? Better make it break away! Carbon fiber is the way to go. They fly good, you'll like it.
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Old 03-10-2012, 09:01 PM
  #1471
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Quote:
ORIGINAL: rebranger

The Seagull Yak are pretty light built,watchfor vibration shaking something a loose! How about the landing gear? Better make it break away! Carbon fiber is the way to go. They fly good, you'll like it.

Yep, I got to fly my first one for about 5 or 6 min. before the engine died and I messed up the dead stick landing. This bird is fragile. Itouched down in ruff off the south end of the runway and it hit a pot-hole right away. The gear folded back and the front part of the fuselage, from the leading edge of the wings forward, broke right off.
I like it so much Iordered new parts and received the fuselage and tail feathers yesterday and began the rebuild. Wish I could have salvaged the tail feathers off the broken bird but, epoxy does not want to turn loose.
I have one small hole in the bottom of the left wing caused by the wheel pants when the gear departed.
Expensive carbon gear legs have a tendency to snap on rough landings. I'd rather have alminum gear legs that Ican bend straight again. I'm getting pretty good at it.
Don't know what normal weather conditions are like where you live but, here in TX we need birds that can handle the wind and the occassional rough landing (mostly caused by the wind). We have more days when the wind is 15mph and up than we do below 15mph. So, If we want to fly, we have to do it in the wind.

RJ

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Old 03-11-2012, 06:47 AM
  #1472
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I fly down at Houston some, at Geo Bush with Bayou City RC,so I know what you mean when it comes to wind!!
Put those nylon bolts in & go with bigger air inflated wheels! Carbon fiber gear takes out the bounce on asphalt/pavement, makes it stick better. I did away with the two piece slide in gear, took out the outter fuse balsa & put in a solid balsa block with screws and #6 blind nuts.  I got Super Tigre 90's in two Yak's. The Carl Goldberg Great Planes (CGGP) ones are heavier built & heavier than the Seagulls. Got a SV 26 gas in one 67" Yak that has 77" wings (839 in sq, versus 1139sq in). That makes it a very different flyer!! 
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Old 03-11-2012, 01:19 PM
  #1473
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[img]webkit-fake-url://4AB1E27E-3B62-4389-ACF3-C7F0FEF11BE5/imagepng[/img]

Mine is glow, Al's Is electric,we both fly at RCACF. Not at the same time
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Old 03-18-2012, 09:48 PM
  #1474
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I'm finally making progress on my rebuild. All of the gear and control serfaces are connected but, need to install the servos, switches, batteries, and engine. I'll have to mount the new engine on my test stand and run at least a tank full through it before Imount it. I'm told they run great right out of the box but, I don't want to take a chance on another engine out while airborne on the first flight. I'm looking forward to getting it finished. I really like this plane.



Ilike the looks of the Yak 54 so much Ireplaced my 30% MX2 (which Iwrecked last Monday) with a 25% Great Planes version. She's a bit smaller at 81" wing span but, the DLE 55 will fit fine even though it will be overkill. I won't have to worry about going UPwith this bird. She'll weigh in around 15 lbs and that's a lot of HP for that weight.


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Old 04-05-2012, 09:48 AM
  #1475
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I've changed my mind about "replacing" the 30% bird with the GP Yak. I'm keeping it and mounting a new 50cc "old style" (side carb) Turnigy gasser on it. I've run it for a couple of ours on a test stand as the instructions say and I must say I'm i mpressed with the thrust it has using a 22x6 Zinger Pro. It's ready to mount and I'm getting closer to "stuffing" this bird. I'm looking forward to flying this one. Hope she flies as good as she looks.

I bought a new Goldwing 30% Edge 540T to replace the MX2 and will mount the DLE55 on it when Iget "roundtoit".

In the mean-time, I'll have 2 Yaks to fly ....the Seagull 90 size and the GP Yak.

The new 26cc engine is a winner in my opinion. She pulls the Seagull Yak like a Clydsdale. No worries about UPwith this engine. Going to fly her again today, she's still breaking in and I'm still adjusting for pitch and yaw but, she's getting closer.
Oh, I pulled the gear from under her the other day. Ibotched a takeoff (duh) and ran her onto the grass runway adjacent to the concrete. It shouldn't have done it but, it did. It didn't appear to have much glue in the mounting block area but, it has plenty of epoxy now. Imay have to add weight to the tale.

RJ
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