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RE: Seagull Yak? - 12/13/2011 2:20 AM   
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Status: offline 		I thought about using two low Mah batteries to save weight and the scenario I mentioned was my main concern. That being said, after over 300 flights with the Life battery set up, I have had no failures and the amps used seams to remain consistant. Which is why I was tempted to go to a single battery. They are supposed to be good for 1000 cycles without a loss of capacity. Still not ready to make that leap. Love my 50cc EF Yak to much and would hate to see it ditched prematurely.

Incidentally, I haven't had this Seagull Yak in at least 3 years, but loved the way it flew. Alot like my EF, in sport mode; only smaller. And I enjoy staying in the loop with other Seagull Yak fliers.

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RE: Seagull Yak? - 12/13/2011 2:26 AM   
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RE: Seagull Yak? - 1/5/2012 5:44 PM   
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Status: offline 		One of our club members has this Yak with a 20cc DLE mounted on it.  If flies great !  His prop is too small but, he plans to correct that soon.  It can be graceful or wild ...just a great flying plane.  It has given me the inspiration to get back to work on mine and get it in the air.  If my RCGF 20cc performs close to his DLE I'll be a very happy camper.

RJ



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RE: Seagull Yak? - 1/13/2012 8:28 AM   
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Status: offline 		I was at the club field a couple of days ago and the guy with the 20cc DLE flew his Yak using a 17"X4" Xoar beechwood prop.  It flew much better but, I think he's a bit oversized on the prop.  I think a 16"X6" would work better IMO.  Landing speed appears to be a bit hot but, nothing exceptionally difficult.  However, this is not an airplane for the beginner.

My Yak is about 60% complete.  The airframe is complete so, now I need to mount the fuel tank, ignition, receiver, batteries, throttle servo, choke servo, and cut the cowl openings.  They way I've been dragging my feet it will probably take another week or so to get it done.

RJ



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RE: Seagull Yak? - 1/13/2012 9:40 AM   
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Status: offline 		A buddy of mine has a DLE 30 hung on the nose of his Seagull Yak. Tons of fun!

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RE: Seagull Yak? - 1/13/2012 1:55 PM   
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quote:

ORIGINAL: rowdyjoe

I was at the club field a couple of days ago and the guy with the 20cc DLE flew his Yak using a 17"X4" Xoar beechwood prop.  It flew much better but, I think he's a bit oversized on the prop.  I think a 16"X6" would work better IMO.  Landing speed appears to be a bit hot but, nothing exceptionally difficult.  However, this is not an airplane for the beginner.

My Yak is about 60% complete.  The airframe is complete so, now I need to mount the fuel tank, ignition, receiver, batteries, throttle servo, choke servo, and cut the cowl openings.  They way I've been dragging my feet it will probably take another week or so to get it done.

RJ



I have one with a G20 on it. I tried several props from 16X6 to 17X8 and settled on 17X6 as the one I like best. 17X8 flies a bit faster, but the 6" pitch allows for better slow down for landing, it can get too slow if I am not paying attention. If the other plane lands fast with a 17X4, don't attribute that to the prop.



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RE: Seagull Yak? - 1/13/2012 3:17 PM   
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Status: offline 		RCVER, How do you like your G-20 ?

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RE: Seagull Yak? - 1/13/2012 8:23 PM   
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quote:

ORIGINAL: RCVFR
I have one with a G20 on it. I tried several props from 16X6 to 17X8 and settled on 17X6 as the one I like best. 17X8 flies a bit faster, but the 6" pitch allows for better slow down for landing, it can get too slow if I am not paying attention. If the other plane lands fast with a 17X4, don't attribute that to the prop.



Oooops, didn't mean to blame it on the prop.  I was trying to pass on my observations of the overall performance of the plane.  I think he said the engine was turning about 7800rpm with the new wood prop.
Thanks for the tip on the props.  I'm new to fuel engines and have learned recently that the prop needs to be matched to the airframe as well as the engine (all up weight I guess). 
I hit the jackpot recently with the choice of prop for my DLE 55 and MX2.  I had been using a 22X10 Zinger Pro and it was working well but, always wanted to try a 23X10.  So, I bought a Xoar in that size and hit the sweet spot.  It makes a BIG difference.  It did not want to stop going vertical so I pullled the power back just before I lost orientation.  I've also noticed that my bird slows down faster with the larger prop.

RJ




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RE: Seagull Yak? - 1/14/2012 2:44 PM   
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quote:

ORIGINAL: RCplanman

RCVER, How do you like your G-20 ?

It's an excellent engine in all respects. It is heavier than the newer 20cc engines, however, I have not found that to be a problem. I am currently running it in the Seagull YAK 54 60-90 and the weight is just right for that airframe.

User friendly, strong (I can't fanthom why the instruction manual proposes 14" and 15" props when the engine is capable of so much more), smooth running and well made. I recommend it.



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RE: Seagull Yak? - 1/16/2012 3:17 AM   
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Status: offline 		I'm making good progress on my Yak.  All electrics are installed, tested and working well.  I need one more short extension and that system will be complete. 
I need a bit more fuel tubing and a "T" fitting to complete the fuel system installation.  Also need to figure out how to rig the choke.  I'm trying to decide whether it's better to go with a servo or do mechanical linkage.  That will depend on ease of installation and operation.
Also need to cut the cowl openings.  That's the part that always scares me.

I'm getting excited about finishing this one.

RJ



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RE: Seagull Yak? - 1/16/2012 2:11 PM   
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Status: offline 		RJ

Do you know how to cut the cowl opening?

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RE: Seagull Yak? - 1/16/2012 7:30 PM   
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quote:

ORIGINAL: WRM

RJ

Do you know how to cut the cowl opening?



Well, I've cut a couple of them before and they turned out OK but, I'm certainly not an expert.  I used my dremmel with a cut-off wheel and made mostly square cuts or large arcs.  I'm leary of trying smaller arcs such as needed for the velocity stack. 
It's all been freehand after measuring and marking.

RJ




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RE: Seagull Yak? - 1/16/2012 8:26 PM   
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Status: offline 		You might try the little sanding barrels for smaller radiuses and smoothing edges.  (They come in two sizes).  I've only got 4 flights on my Yak, but so far I like it.




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RE: Seagull Yak? - 1/16/2012 8:32 PM   
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Status: offline 		jknox,
     Thanks for that tip.  That's a forehead slapper for me (duh).  I've got a couple of dozen of those and never thought about using them.  That should do the job nicely.

RJ



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RE: Seagull Yak? - 1/17/2012 4:13 AM   
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Status: offline 		Just completed the fuel system installation and mounted the wings for the first time.  Found I put the fuel DOT too low on the fuselage and it interfered a tad with the right wing.  So, redrilled and covered the first hole.   
Turned on the electrics with all servos connected and checked and adjusted control surface alignmnet. 
All I need to do now is fill the tank and fire here up.  I've run this engine extensively on the bench so there should be no issues with it.
Also need to cut the cowl holes and will do that tomorrow. 
I'm undecided whether to do the first flight with or without the cowl.  I'll probably do it without.

She looks great but, I'm going to add some black stripes on the bottom side of the wings to help me with orientation. 
First flight should be Wed. this week if the WX forecast holds true.

RJ



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RE: Seagull Yak? - 1/17/2012 11:22 AM   
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Status: offline 		Yea, I'm suprised that Seagull didn't add stripes or anything to differentiate the bottom of the wing from the top.  I got a little carried away striping mine.  Just curious where you set your CG and if you were able to balance without additional weight.  I had to eject my pilot to avoid nose weight.  And good luck on your maiden flight.

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RE: Seagull Yak? - 1/17/2012 2:02 PM   
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Status: offline 		I'de recommend flying with the cowl. Without it, the pitch trim will be different.


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RE: Seagull Yak? - 1/17/2012 3:31 PM   
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Mine is sold now, had about 70 flights on her and she will be missed. Got a chance to pick up a pilot yak 26% with dle 30 with 6 flights on it for a bargin, wanted to keep the seagull and especially the engine but simply got to many planes and had to generate cash so im not stealing frm the marrage fund.

On the cowl my first fifty flights was without cowl, and then the rest with cowl. I did need to retrim after the cowl fitment but it was not a drastic change in pitch, so she will fly fine without cowl.

I also picked up a crrc 26 pro v1 side induction engine and have it fitted to a pitts 1/4 scale that I have yet to fly. I have rebuilt this engine and she is timed and tuned for max performance and running great.  But although heavier and a bigger displacement she is 800 rpm down on the same prop that the rcg 20 rear induction reed valve motor!

This was very suprising for me, so be warned those who are fitting 26 cc side induction motors, you may not get the same performance as a 20 cc rear induction reed valve  like a dle or rcg.  Having said that the 26 was spinning a 17 7 at 7400 rpm so still had about 12 pound thrust by the feel of things so would still fly the 10 1/2 lb yak straight up.



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RE: Seagull Yak? - 1/17/2012 5:37 PM   
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Status: offline 		CG?  I have to set the CG?               

Forgot to mention that it's one more thing I have to do before flight.  I have my fingers crossed that it won't require much, if any, weight. 

RJ



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RE: Seagull Yak? - 1/17/2012 6:01 PM   
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Status: offline 		COG is rear of wing tube, factory spec COG is a bit suspect.

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RE: Seagull Yak? - 1/18/2012 2:36 AM   
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Status: offline 		Well, she's all in one piece.  I mounted the cowl about an hour ago after a bit of trial and error.  It fits fine and looks good and all the stuff that heats up should get plenty of cooling. 

Assembled everything and attempted to balance her at the factory CG ....7 to 8 CM back from the leading edge at the wing tip.  OOOPS !   Waaaaaay nose heavy.  Guess that little 20cc gasser is heavier than it looks.  Haven't weighed it yet but, that's next.

I've searched this thread for CG advice and find that most folks are recommending 5.5 inches back from the leading edge at the root.  I'll try that next but, wanted to look around a bit first to see if there is a consensus about the CG location. 

I'm still hoping for first flight tomorrow but, I'm getting pretty tired.  I've been working on this bird since about 11 AM.  Ran the engine for a while and found that I'm getting 7700 RPM with a 16x8 Xoar prop and velocity stack installed.  I removed the stack to make the cowl fit better and I discovered that it cost me 500 RPM.  Lesson learned ....velocity stacks work well. 

More later.

RJ



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RE: Seagull Yak? - 1/18/2012 3:01 AM   
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quote:

ORIGINAL: rowdyjoe

Well, she's all in one piece.  I mounted the cowl about an hour ago after a bit of trial and error.  It fits fine and looks good and all the stuff that heats up should get plenty of cooling. 

Assembled everything and attempted to balance her at the factory CG ....7 to 8 CM back from the leading edge at the wing tip.  OOOPS !   Waaaaaay nose heavy.  Guess that little 20cc gasser is heavier than it looks.  Haven't weighed it yet but, that's next.

I've searched this thread for CG advice and find that most folks are recommending 5.5 inches back from the leading edge at the root.  I'll try that next but, wanted to look around a bit first to see if there is a consensus about the CG location. 

I'm still hoping for first flight tomorrow but, I'm getting pretty tired.  I've been working on this bird since about 11 AM.  Ran the engine for a while and found that I'm getting 7700 RPM with a 16x8 Xoar prop and velocity stack installed.  I removed the stack to make the cowl fit better and I discovered that it cost me 500 RPM.  Lesson learned ....velocity stacks work well. 

More later.

RJ








Definately balance it at 5.5" back from the leading edge next to the fuse.....mine balanced spot on with a Saito 180 (31oz) by simply positioning the RX battery to rear of the fuse under the canopy area. Not sure what your gasser wieghs, but it may take more than that to balance it correctly.


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RE: Seagull Yak? - 1/18/2012 3:07 AM   
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Status: offline 		Sourkraut,
     Thanks for the advice.  I just weighed and balanced her and she came in at 10 lbs even.  Balance at 5.5" back from LE at the root was just a tad nose heavy.  MUCH better.  I like my birds to fly neutral so, I may add an ounce or two to get the sweet spot. When I turn them inverted, I like little to no forward stick at mid throttle.  After I fly her tomorrow I'll have a better idea of how she balances in flight.

I'm happy with the set-up so far.  Wish me luck on the first flight.

RJ



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RE: Seagull Yak? - 1/18/2012 3:41 AM   
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quote:

ORIGINAL: rowdyjoe

Sourkraut,
     Thanks for the advice.  I just weighed and balanced her and she came in at 10 lbs even.  Balance at 5.5'' back from LE at the root was just a tad nose heavy.  MUCH better.  I like my birds to fly neutral so, I may add an ounce or two to get the sweet spot. When I turn them inverted, I like little to no forward stick at mid throttle.  After I fly her tomorrow I'll have a better idea of how she balances in flight.

I'm happy with the set-up so far.  Wish me luck on the first flight.

RJ




Mine came in at 9lbs 12oz without cutting the bottom out of the canopy and using the stock landing gear. (just like she came out of the box)

Balance her at 5.25-5.5" and the maiden will be a success.

Good luck with the maiden



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RE: Seagull Yak? - 1/18/2012 4:26 AM   
rowdyjoe


 

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Status: offline 		Yep, same here.  Box stock with a 20cc RCGF gasser.

A fellow club member has this bird with a 20cc DLE and it flies great with plenty of power.  Hope mine flies as well.  I'm a bit concerned about the 500 RPM loss without the velocity stack and am considering going to a smaller prop to get more RPM.  I think mine should turn between 8 and 9K so, I'm down on RPM by a bunch.  We'll see tomorrow.

RJ



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