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65" Yak on the way...feel free to comment

Old 10-14-2004, 06:06 PM
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Woody218
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Default 65" Yak on the way...feel free to comment

I just ordered the 65" Yak from OMP, here's the hardware I will be using, I invite comments...

Saito 100

APC 16X4 wide chord prop

Hitec 5925 on ailerons, elevator and rudder

Hitec HS-81 for throttle

1600 mah 6V airborne pack
Old 10-14-2004, 07:42 PM
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basmntdweller
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Default RE: 65" Yak on the way...feel free to comment

Looks good. You might have an APC 16-6 standard prop handy. Both of my YS 4 strokers like a bit more pitch than my 2 strokers. I have the YS 110 on my Yak. It's not my favorite plane yet but it moves up the list nearly every time I fly it!
Matt
Old 10-14-2004, 08:35 PM
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martyg
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Default RE: 65" Yak on the way...feel free to comment

I just ordered the 65" Yak from OMP
GREAT flying airplane.
Easy build. Keep it light and straight. Shoot for 7lb AUW.

Saito 100
APC 16X4 wide chord prop
I used the Saito 100 on mine. No regrets.
Fuel with Powermaster 20/20. Use a OS-F plug. Takes 3 gallons to really come in.
Enough power for good pullouts. Not ballistic, but more than adequate.
Settled on the APC 15x6 as day-to-day prop. Your flying style may vary.

Hitec 5925 on ailerons, elevator and rudder
Seems like overkill for a 7lb airplane.
I used 5625s for ailerons and elevator. Plenty of torque. Accurate. Cheaper.
Already had a spare 945 for rudder so used that. Otherwise would have used a 5925.

Hitec HS-81 for throttle
I've had bad luck with flakey servo pots with these servos.
I avoid these like the plage in powered planes now.
Already had a HS-85MG, so I used that.

1600 mah 6V airborne pack
That's what I used.
The servos above draw a ridiculouly small amount of current.
I get about 4 hours of flight time to a charge.
Old 10-15-2004, 07:44 AM
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AFSalmon
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Default RE: 65" Yak on the way...feel free to comment

I agree with Marty on the servos. Good combination and you'll have enough battery to last all day. I use the 81s also for throttle although they last about a year and go south. Seems the pots give out and then they start jumping around. The 5925s will give you more power than you need for this plane but hey, this is what we do!
Old 10-15-2004, 08:13 AM
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Woody218
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Default RE: 65" Yak on the way...feel free to comment

Yeah, I know the 5925 servos are way more power than I need, but I like the speed of these on 6 volts, and, I already have them, so why not use 'em!
Old 10-17-2004, 11:45 AM
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Rumple
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Default RE: 65" Yak on the way...feel free to comment

I going to start getting mine together too. How do these servos sound?

ailerons: HS-6965 (111 oz-in @ 6V)
elevator: HS-6975 (144 oz-in @ 6V)
rudder: HS-6985 (172 oz-in @ 6V)
throttle: HS-325HB

Overkill torque? If so, maybe I can go with a 4.8V pack and either lighten the payload or get higher capacity?

I too have smoked 3 HS-81 throttle servos on profile planes. I will never use one again on a profile where they are mounted right behind the engine. You sure do get adicted to the speed of this little servo though, its a shame. Those delicate little gears can't take the Saito 4-stroke vibration. Although, I have one mounted in the wing of my CG Ex-treme 330 with Saito 72 that is doing fine - I guess its isolated enough.

Kurt
Old 10-17-2004, 04:43 PM
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GarySS
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Default RE: 65" Yak on the way...feel free to comment

So what throttle servo are you going to? Another Hitec such as their 225's or???
Thanx
Old 10-17-2004, 06:54 PM
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m.gramling
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Default RE: 65" Yak on the way...feel free to comment

I am using a OS91Fx, Hitec 225 on throttle, 945's on rudder and elevator, and 5945s on wings. 1650 6volt niMh battery pack. All up weight is 7lbs 12oz.

I am thinking about putting on a TT 1.20 2 stroke.


But you will definatly need to lighten this plane up. I would either replace the wood that sheets the fuse or sand it like crazy. Cut holes in the back of fuselage, with a 1 1/2 hole saw. I would cut 8-10 along the top of the rear fuselage. Do anything you can to lighten it up. Get it to 7lbs and you will be very happy. Mine came out real tail heavy. I need to add about 5oz of weight to the nose to get it to fly neutral inverted. But it already weighs to much, so I just fly it tail heavy. The plane flys real good and light, just make sure it comes in way around 7lbs. the only way you know this plane is heavy is going vertical.

Its a real good plane, Just MAKE SURE ITS LIGHT
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Old 10-18-2004, 11:30 PM
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Rumple
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Default RE: 65" Yak on the way...feel free to comment

So what throttle servo are you going to? Another Hitec such as their 225's or???
This may be meaningless, but why does the 225 draw such high no load current compared to the other Hitecs? 340 mA! I was leaning towards the HS-325HB for throttle for this reason.

Kurt
Old 10-21-2004, 04:49 PM
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Rob Kelly
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Default RE: 65" Yak on the way...feel free to comment

How you get one of these up to 7 3/4 pounds with a FX.90? I'm at 6 3/4 with the FX.
As far as servos go I'm using Futaba 9102's on ailerons and 3004's on rudder and elev. Yes, 3004's and they work fine, knife edge loops no problem. Sometimes less is more!

Rob
Old 10-21-2004, 05:14 PM
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m.gramling
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Default RE: 65" Yak on the way...feel free to comment

Used stock wood on mine. My wood was hard as a 2x4. Sheeting was suppose to be 1/16. It was more like 1/8"
Old 10-21-2004, 07:58 PM
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aviti
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Default RE: 65" Yak on the way...feel free to comment

m gramling - If your plane flies light except on the vertical, and it is tail heavy, sounds like more power up front would solve both...YS 110 perhaps??
Old 10-22-2004, 10:04 AM
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Default RE: 65" Yak on the way...feel free to comment

Ya, I know I need more power. I need nose weight. I just don't want to spend the money on a new motor. so needless to say, the plane has been flown 1 flight since May. i like the plane I need to do something else about a motor.

I don't want to buy a another motor, because this is probably the only plane I will need it on. I either fly .40 size or gas.
Old 10-22-2004, 06:14 PM
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Default RE: 65" Yak on the way...feel free to comment

Mine came out to 7lb 4oz but I have had to add 2.5oz of spinner weight to get it to balance. I have the YS 110 on mine. Plenty of power just a bit tailheavy without the spinner weight. I have HS-5975 on rudder, it needs more. Maybe 8611 in it's future. It's not my favorite plane yet but it's moving up the list!
Matt
Old 10-25-2004, 02:51 PM
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Default RE: 65" Yak on the way...feel free to comment

8611 on the rudder? That's way overkill. 100 - 120 in oz of torque is plenty on this size plane. Remember, these style profiles are designed for slow "ballet in the sky" type flying. You don't want to overspeed the plane and try snapping full deflections, you will break the airplane! The amount of power we have on these planes these days is really something to appreciate with the left stick. LOL
Old 10-25-2004, 06:03 PM
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Woody218
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Default RE: 65" Yak on the way...feel free to comment

Yeah, no kidding. A 16X4 APC turning 9500 RPM will deliver 17.74 lbs of thrust. Even if you only got it to 9000 RPM, that's still 15.92 lbs of thrust. On a 7 lb airplane, that's more than enough!!
Old 10-25-2004, 09:23 PM
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Default RE: 65" Yak on the way...feel free to comment

A 16X4 APC turning 9500 RPM will deliver 17.74 lbs of thrust. Even if you only got it to 9000 RPM, that's still 15.92 lbs of thrust.
LOL, those numbers gotta be way off. Obviously a calc and not a real measurement. And 2 decimal places! I think you're lucky if those numbers are within 5 lb of the right values. I don't think they are.
Old 10-26-2004, 11:34 AM
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Default RE: 65" Yak on the way...feel free to comment

FYI, I did a bunch of thrust tests with my Saito 100 trying to figure out if could EVER be happy with it on a Funtana 90. I should have put my pro-bro experience to good use and just realized it was way too small for a 9 lb plane.

http://www.rcuniverse.com/forum/m_19...tm.htm#1940028
Old 10-26-2004, 01:36 PM
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Default RE: 65" Yak on the way...feel free to comment

Thanks man, that was very useful data, never seen it before. I'll repost it here:

--------------------------------------------------------------------------
Temp 75deg, Humidity 68%, 500 foot above sea level, 30% heli fuel. Glo Bee Tach, Rapala 50 lb digital fish scale.

APC 16x4W : 11 lb 7 oz, 9400 RPM
Zinger 16x5 : 11 lb 4 oz, 8500 RPM
APC 15x4W : 10 lb 10 oz, 9900 RPM
APC 15x6 : 10 lb 10 oz, 9200 RPM
Zinger 15x6 : 10 lb 7 oz, 9000 RPM
Top Flite 16x4 : 10 lb 2 oz, 9700 RPM
Top Flite 15x6 : 9 lb 12 oz, 9100 RPM
--------------------------------------------------------------------------

I never see such high rpms with my Saito 100 running 15% nitro fuel. I can see how 30% heli fuel could be addictive.

Kurt
Old 10-27-2004, 01:49 AM
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Default RE: 65" Yak on the way...feel free to comment

It's amazing to me that the APC puts out more than 1 lbs more thrust than the Top Flite at even lower rpms.
Old 10-27-2004, 11:25 AM
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wind junkie
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Default RE: 65" Yak on the way...feel free to comment

the Top Flite props I used are very old ones that I bought back when the Carl Goldberg Ultimate Bipe was popular. I had a Webra 120 in it and got a whole bunch of props to try.

I don't think Top Flite even makes those styles or sizes anymore. It's a very pretty and lightweight prop, but I bet it flexes all over the place compared to the newer ones, and that's why you're seeing them at the bottom of the list.
Old 10-28-2004, 02:02 AM
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Default RE: 65" Yak on the way...feel free to comment

O ok that makes sense. I also have a pack of REALLY old topflite wood props which I always used on my Fun Fly. Their 11X4s and super light. The pick up was great but the other day I broke one and only had a Master Airscrew 11X4 handy. Quite odd that the MA is though a little heavier but the pick up was still fine. Amazing though that I could really feel a difference in the vertical and the RPM was definitely higher. You know sometimes you can just hear the RPM go up no question about it. But yes like I said the TopFlites I have is REALLY old stuff. Coming out of probably the 80s.

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