AM 37.5% Yak Wings

[gdavisjr69]

All,

As most of you are aware, AM just released the updated 37.5% Yak wings. I have two of their 37.5% Yaks that I had just finished up when learning of the new wings. Earlier today, I juse received the updated wings. What's interesting is that I have a red/white/blue/blue set along with an orange/checkerboard set and they are different. Are they supposed to be different form each other. They've been reinforced and updated differently comparing the two. I'll try and post pics of what I'm talking about.....

The bottom line is that the orange wings have oval lightening holes at the root rib, they've squeezed an extra rib between the 2nd and 3rd ribs, added reinforcements around the wing tube, the lightening holes are much smaller, but the ribs appear to be made out of balsa, etc. Also, the s/n ends with 1/2 and the anti-rotation dowels aren't glued in. The blue/blue one has the same lightening holes the original wings did, and they've been reinforced around the wing tube and so forth, but differently than the orange one's have. The s/n doesn't end with 1/2 as the other does. Its just very odd. Not sure what to make of it.

I'm hoping Garrett or somebody can make something of it. Just want to make sure I've got two very strong set of reinforced, "updated" wings before rehinging and so forth. Anybody have a clue? I've left a voice mail with AM and also just sent them pics, but haven't heard anything as of yet. Just hoping somebody might be in the know here at flying giants.

I'll try and add pics to help show what I'm trying to say.

Gerry

[gdavisjr69]

Here are a few of the red/white/blue/blue wings.

Gerry

[gdavisjr69]

Here are a few of the orange/checkerboard wings.

Gerry

[gdavisjr69]

Again, both wings are reinforced compared to the original wings, they've just been done differently between the two of them. Just weird they'd be different. Nobody else would have probably known unless you had two different planes to compare against.... Just trying to make sure all is well with both wing sets before hinging and setting them up. Garrett, are you there to explain?

Thanks ahead of time,

Gerry

[Tailchaser]

Garrett is changing a sensor on his truck so probably won't be able to answer you right away, I'm sure when he see's your post he will reply.

Chuck

[f1race79]

Gerry, since you have 2 of these and sounds like they are ready to fly. A couple of questions if you don't mind?
I am putting one of these together since I have my new wings, I am wanting to put 2 5995's in the wing and one each in the elevators. They will be running on 7.4V, that means over 400 oz. torque @.
Think this will be enough torque and not too much flexing?
Thanks for any info you can give me.

[TheTank]

F1, I am running 2x5955s in the wings and it is fine. I dont however recommend only using one servo in the elevator though, as the leverage point for the linkage when only using one leaves alot of area unsupported, which could lead to flutter. I have seen one (the 40% Yak) use one elevator servo (8611A) and it worked... but it was kinda scary. I am running 4x5945a in on the elevators with great results.

[gdavisjr69]

Julius,

I finished these two up, but never flew them, so I can't give direct knowledge in terms of what will and won't work on this plane However, I can give you my persepctive from past planes.

I believe 2 5955's per wing will work, provided you don't try and get the absolute amount of throw you need. If you go back 7-10 years ago, pilots, including me, used to fly 40% planes with 8411's/5945's on wings--two per aileron mostly. Then many of the top pilots went to three per wing panel using 8411's/5945's. This was the norm for many years... Then 5955's/8611's came out, and people began trying two instead... However, years ago, we didn't stress ailerons nearly as much as people do now. I'd advise if you go with only two, not to fly with extreme throws on the ailerons. Also, in some cases, the surfaces back then were smaller. But I have compared some of my older planes to the current generation, and depending on the company, they are similiar in area in some cases.... so not always larger today. Again, if going with 2, I'd watch speed while cranking 3D/extreme rates at first....

Again, same thoughts on elevators. A lot of it depends on the setup more than anything else. If you end up with 50 degrees of throw, high speed walls, other high speed, large elevator type movements, one probably won't be enough. But, if you are a little tame with it, do more precision type flying, one would probably be plenty. Alot depends on setup and flying styles. Read the article that Peter Goldsmith put up regarding setups, servos, etc up at horizon. Again, he doesn't go with extreme throws so he doesn't have to use as many servos and so forth--enough to do some 3D, but not to the extreme like many do these days.

Hopefully this helps. Again, this is my perspective and I'm sure you'll get a dozen other opinions out there as well.

Gerry

[SUPERFLYJAY]

i had 2 8411 in each wing (37.5 yak) and it was a dog the ailerons are so huge you def need 3 8411 per half or prob get away with 2 8611a in each half

[why_fly_high]

My buddy was getting blow back on the 40% Yak with 3 8411's. That was with a 1-1 ratio. Are the ailerons on the 37.5 much smaller. I would suspect that you might have the same issue with 3 being that the 37.5% should fly faster than the big 40%er with a 150 on it.

Just a thought,

Dan

[rdgood]

Gerry,

I just got my replacement set also. After looking everything over ,the best I can tell - it looks like the only real difference is that all of the ribs have the oval lightening holes instead of the vertical pieces. I do believe that the wings are little bit heavier - I haven't wieghed them yet. I think these wings are bulllet proof though they seem stiffer and the covering on mine is better - the originals weren't bad a sag here and there. I definitely feel better about these wings though.


Ronster

[TrojanMan]

Just an FYI,
I weighed the new wings and the old wings. My new wings are 9 to 10 ounces heavier per wing. Not a big deal but the new wings are definitely build much stronger. Now I need to save a pound somewhere else!

Jim