Extreme Flight 87" Yak 54 - Build & Fly
#3401
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: turbo4
anyone using the stock DA muffler without cutting the cowl on the side?(to clear the muffler)
anyone using the stock DA muffler without cutting the cowl on the side?(to clear the muffler)
I think the trick is to not go past the first former. not even the slightest bit. Had I even gone a 1/16 more my mufffler would have hit. When it's all done you can "bologna cut" (cut at an angle) about 2 inches (at the longest part) off the pipe. It actually looks pretty scale
john
#3402
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: wgeffon
Yes. For strength and because the cowl is thin.
The threads on the dot bottom out before it actually tightens into the cowl. The wood takes care of that.
I wouldnt recomend putting the fuel lines anywhere near the foam. One leak and your gonna have problems.
ORIGINAL: jrjohn
Wayne, did you epoxy a small piece of wood to the inside of the cowl to give it some strength?
Wayne, did you epoxy a small piece of wood to the inside of the cowl to give it some strength?
The threads on the dot bottom out before it actually tightens into the cowl. The wood takes care of that.
I wouldnt recomend putting the fuel lines anywhere near the foam. One leak and your gonna have problems.
How big and how thick of a piece of wood did you use?
did you put a radius on it?
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RE: Extreme Flight 87" Yak 54 - Build & Fly
Stock muffler cut off to 1.5": 6700 rpm @ 98db
Stock muffler uncut: 6720 @ 97-98 (it jumped between the two a little but stayed mostly on 97)
Supersonic inverted pitts wraparound (pipe exits are straight, no swages): 6510 rpm @ 95 db
Bisson inverted pitts wraparound (swaged pipe exits): 6250 rpm @ 94 db
Chip Hyde Quiet Pipe: 6780rpm @ 93 db
Stock muffler uncut: 6720 @ 97-98 (it jumped between the two a little but stayed mostly on 97)
Supersonic inverted pitts wraparound (pipe exits are straight, no swages): 6510 rpm @ 95 db
Bisson inverted pitts wraparound (swaged pipe exits): 6250 rpm @ 94 db
Chip Hyde Quiet Pipe: 6780rpm @ 93 db
According to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
#3404
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RE: Extreme Flight 87" Yak 54 - Build & Fly
Wayne, I'm curious exactly where you put that fuel dot in the cowl. The way I see it there is 3 options.
At the top, and then you need to have a hole in the top of the engine box as well, for the fuel line to pass
In the side of the cowl, then you need a hole in the side of the engine box.
in the lower part of the cowl, and run the fuel line through the opening in the bottom of the engine box. (this is lower than the tank and you will always spill fuel do to fact that it will siphon. until you put the stopper dot in the line.
john
At the top, and then you need to have a hole in the top of the engine box as well, for the fuel line to pass
In the side of the cowl, then you need a hole in the side of the engine box.
in the lower part of the cowl, and run the fuel line through the opening in the bottom of the engine box. (this is lower than the tank and you will always spill fuel do to fact that it will siphon. until you put the stopper dot in the line.
john
#3405
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: turbo4
According to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
Stock muffler cut off to 1.5": 6700 rpm @ 98db
Stock muffler uncut: 6720 @ 97-98 (it jumped between the two a little but stayed mostly on 97)
Supersonic inverted pitts wraparound (pipe exits are straight, no swages): 6510 rpm @ 95 db
Bisson inverted pitts wraparound (swaged pipe exits): 6250 rpm @ 94 db
Chip Hyde Quiet Pipe: 6780rpm @ 93 db
Stock muffler uncut: 6720 @ 97-98 (it jumped between the two a little but stayed mostly on 97)
Supersonic inverted pitts wraparound (pipe exits are straight, no swages): 6510 rpm @ 95 db
Bisson inverted pitts wraparound (swaged pipe exits): 6250 rpm @ 94 db
Chip Hyde Quiet Pipe: 6780rpm @ 93 db
According to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
1 Great power
2 very lite (less than 1/2 the weight of the others
3.Easy install
4. low cost
As for your question about rpm's 500 rpms is a lot
John
#3407
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: Maudib
Kregg, that's really cool lookin... sut I do miss a head to go with that girl pilot...
BBRiBro... does that mean I can have your "old" one?
JrJohn, today is the 4th day of chemo... doing pretty good... not too much sickness from it yet. There will be a steep decline in how I feel in about a week. I have 2 more days of it before the transplant.
Kregg, that's really cool lookin... sut I do miss a head to go with that girl pilot...
BBRiBro... does that mean I can have your "old" one?
JrJohn, today is the 4th day of chemo... doing pretty good... not too much sickness from it yet. There will be a steep decline in how I feel in about a week. I have 2 more days of it before the transplant.
#3408
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: jrjohn
jon, I think the gromets get eaten from the outside (the fiberglass) I'm going to epoxy the threads for the first 1/8 inch so the threads can't do any cutting, but again I think it's the fiberglass cutting the gromet. I wonder if anybody else has a fix for this problem
John
ORIGINAL: jpa2002
jrjohn, would it be a good idea to put a piece of brass tubing through the grommet, and maybe that would help? I have never tried it, but I my do that. Something similar to the way the brass grommets go in our servo rubbers.
Jon
jrjohn, would it be a good idea to put a piece of brass tubing through the grommet, and maybe that would help? I have never tried it, but I my do that. Something similar to the way the brass grommets go in our servo rubbers.
Jon
John
#3409
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: jrjohn
Wayne, I hear you loud and clear on the fuel/foam issue. I noticed in the instructions they seem to have it mounted in the foam.
How big and how thick of a piece of wood did you use?
did you put a radius on it?
ORIGINAL: wgeffon
Yes. For strength and because the cowl is thin.
The threads on the dot bottom out before it actually tightens into the cowl. The wood takes care of that.
I wouldnt recomend putting the fuel lines anywhere near the foam. One leak and your gonna have problems.
ORIGINAL: jrjohn
Wayne, did you epoxy a small piece of wood to the inside of the cowl to give it some strength?
Wayne, did you epoxy a small piece of wood to the inside of the cowl to give it some strength?
The threads on the dot bottom out before it actually tightens into the cowl. The wood takes care of that.
I wouldnt recomend putting the fuel lines anywhere near the foam. One leak and your gonna have problems.
How big and how thick of a piece of wood did you use?
did you put a radius on it?
1) Dremel a hole in the cowl to fit your dot where you want it.
2) cut a balsa square about 1 1/4" and cut the required sized hole in the center
3) use silicone adhesive instead of epoxy or CA as it will be flexible and well-sealed.
4) to hold it in place while it dries, just install the fuel dot and you're done...I also recommend a thin film of silicone on the threads of the dot prior to installing the nut as a "lock-tite, and a sealed install. YOU'RE DONE!
#3410
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: jrjohn
Turbo, if noise isn't an issue then as far as i'm concerned there is only one choice. The stock muffler.
1 Great power
2 very lite (less than 1/2 the weight of the others
3.Easy install
4. low cost
As for your question about rpm's 500 rpms is a lot
John
ORIGINAL: turbo4
According to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
Stock muffler cut off to 1.5": 6700 rpm @ 98db
Stock muffler uncut: 6720 @ 97-98 (it jumped between the two a little but stayed mostly on 97)
Supersonic inverted pitts wraparound (pipe exits are straight, no swages): 6510 rpm @ 95 db
Bisson inverted pitts wraparound (swaged pipe exits): 6250 rpm @ 94 db
Chip Hyde Quiet Pipe: 6780rpm @ 93 db
Stock muffler uncut: 6720 @ 97-98 (it jumped between the two a little but stayed mostly on 97)
Supersonic inverted pitts wraparound (pipe exits are straight, no swages): 6510 rpm @ 95 db
Bisson inverted pitts wraparound (swaged pipe exits): 6250 rpm @ 94 db
Chip Hyde Quiet Pipe: 6780rpm @ 93 db
According to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
1 Great power
2 very lite (less than 1/2 the weight of the others
3.Easy install
4. low cost
As for your question about rpm's 500 rpms is a lot
John
I went the middle route...chip hyde pipe-a half pound heavier but 12 more ounces of thrust. I still plan/hope to be under or right at 15.5 lbs. I figured that if Wayne's plane is 15lb,7oz. with nimh batteries, a tru-turn spinner, wheelpants, and the dubro tires, it shouldn't be a problem, since I am running Li-ions, a CF spinner, Dave brown wheels, no pants, a mini throttle servo, and smaller tank. Off the top of my head, that's over 10 ounces savings right there...
#3411
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RE: Extreme Flight 87" Yak 54 - Build & Fly
Not the slightest... at very best I'll get out of the hospital mid April...Averages say end of April. I'll be there in spirit.
I'll never forget last year when best buddy Tom Pierce (NEO on RCU) stole the show with his Dauntless. His first scale anything!
I'll never forget last year when best buddy Tom Pierce (NEO on RCU) stole the show with his Dauntless. His first scale anything!
ORIGINAL: bodyworks
Is there even the slightest possibility that you will be at Toledo??? If not, then I guess we'll run into you at the "yakfest" in august???
Is there even the slightest possibility that you will be at Toledo??? If not, then I guess we'll run into you at the "yakfest" in august???
#3412
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RE: Extreme Flight 87" Yak 54 - Build & Fly
John,
The piece of wood I used is just slightly larger (diameter) than the fuel dot.
Its made out of 3/32 basswood.
My fuel dot is on the yellow stripe on the cowl. The line does have to pass through the motor box. Its nothing a drill bit cant take care of..
The piece of wood I used is just slightly larger (diameter) than the fuel dot.
Its made out of 3/32 basswood.
My fuel dot is on the yellow stripe on the cowl. The line does have to pass through the motor box. Its nothing a drill bit cant take care of..
#3413
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RE: Extreme Flight 87" Yak 54 - Build & Fly
Anybody ever try these for mounting a fiberglass cowl? I think they would hold up a lot better than rubber grommets.
http://www.pspmfg.com/CowlBinders.html
http://www.pspmfg.com/CowlBinders.html
#3414
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: Dave763
Anybody ever try these for mounting a fiberglass cowl? I think they would hold up a lot better than rubber grommets.
http://www.pspmfg.com/CowlBinders.html
Anybody ever try these for mounting a fiberglass cowl? I think they would hold up a lot better than rubber grommets.
http://www.pspmfg.com/CowlBinders.html
thank you
John
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: turbo4
according to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
according to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
ORIGINAL: jrjohn
Wayne, I'm curious exactly where you put that fuel dot in the cowl.
Wayne, I'm curious exactly where you put that fuel dot in the cowl.
#3417
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RE: Extreme Flight 87" Yak 54 - Build & Fly
I have used the PSPMFG Cowl Binders with a GP Wagstaff/DA50 Combo. They work pretty well as long as you install 4/40 bolts instead of the ones provided. The bolts provided broke from vibration. Once I went to 4/40 - no problems at all.
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RE: Extreme Flight 87" Yak 54 - Build & Fly
jrjohn,
I would have to pull the cowl out for a pciture, but I can describe it, it is very simple, After drilling the holes in cowl, CA(thin) the CA hinge from inside to the cowl hole. Hinge centering the hole and put some more CA, (thin), no kicker.
Drill the hole on hinge from the cowl hole and you have support for the cowl holes from inside, you can repeat this as many layers as you want, weight is no problem, CA hinges are flexible(what they are designed for) and strong, sticks good. And prevents cowl from cracking.
I would have to pull the cowl out for a pciture, but I can describe it, it is very simple, After drilling the holes in cowl, CA(thin) the CA hinge from inside to the cowl hole. Hinge centering the hole and put some more CA, (thin), no kicker.
Drill the hole on hinge from the cowl hole and you have support for the cowl holes from inside, you can repeat this as many layers as you want, weight is no problem, CA hinges are flexible(what they are designed for) and strong, sticks good. And prevents cowl from cracking.
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RE: Extreme Flight 87" Yak 54 - Build & Fly
Hi All,
Just a quick observation of my Yak.
The wing tube is very tight within the wing, and when assembling the Wings into their 'socket' although the incidence pegs and bolt holes line up perfectly the skin/ polystyrene seems out of alignment slightly ie. there is a gap on the top of the left hand wing and on the bottom of the right hand wing panels where the wing would 'seat' on the fuzz.
The alignment to the rear stab tube is slightly off not enough to worry about??
The problem is annoying because it is VERY hard to assemble the wings I'm having to use the wing bolts to pull everything together, and then to disassemble them I'm concerned that I will pull a wing tip off trying to extract the wing!!!
Any help on how to loosen the wing tube slightly and is anyone having to open up the wing socket to get the wing to enter?? ( I will try to get some photos this week)
I quite realize that these kind of problems are to be expected on a first production run, and it is a price we tend to pay for being the first one on the block with a model to show off.
The plane looks simply stunning and I'm really itching to get her airborne.
Just a quick observation of my Yak.
The wing tube is very tight within the wing, and when assembling the Wings into their 'socket' although the incidence pegs and bolt holes line up perfectly the skin/ polystyrene seems out of alignment slightly ie. there is a gap on the top of the left hand wing and on the bottom of the right hand wing panels where the wing would 'seat' on the fuzz.
The alignment to the rear stab tube is slightly off not enough to worry about??
The problem is annoying because it is VERY hard to assemble the wings I'm having to use the wing bolts to pull everything together, and then to disassemble them I'm concerned that I will pull a wing tip off trying to extract the wing!!!
Any help on how to loosen the wing tube slightly and is anyone having to open up the wing socket to get the wing to enter?? ( I will try to get some photos this week)
I quite realize that these kind of problems are to be expected on a first production run, and it is a price we tend to pay for being the first one on the block with a model to show off.
The plane looks simply stunning and I'm really itching to get her airborne.
#3420
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RE: Extreme Flight 87" Yak 54 - Build & Fly
I would not worry about the alignment unless it actually makes the incidence of the two wings different. You may want to check that...
As far as the wings being a PITA to install, there are a couple options...
1)deal with it and wait for them to wear in.
2)I noticed that the ends of the wing tubes seem to have a little "flare"...they seem to be ever so slightly larger than the rest of the tube, so you can sand a taper on the ends.
3) use some scotch brite to slightly buff the CF, a little at a time, until they fit better.
As far as the wings being a PITA to install, there are a couple options...
1)deal with it and wait for them to wear in.
2)I noticed that the ends of the wing tubes seem to have a little "flare"...they seem to be ever so slightly larger than the rest of the tube, so you can sand a taper on the ends.
3) use some scotch brite to slightly buff the CF, a little at a time, until they fit better.
#3422
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RE: Extreme Flight 87" Yak 54 - Build & Fly
[quote]ORIGINAL: BBriBro
ORIGINAL: turbo4
according to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
according to Maudib's tests as shown above how does 500+/- rpm(diff.between the highest and lowest) translate in how the plane feels. Big diff., some diff., cant tell?? Im really struggling on muffler selection. I like the pitts look /touch quiter but dont want to sacrafice any power or add weight unless it gets made up on power. I wish he would have included the slimline in the test[&o].....is the stock DA muff loud enough you wish it were quieter? Annoying? Help[sm=bananahead.gif]
ORIGINAL: turbo4
In a monumental effort to get "caught up" on the build and fly, I have just finished reading all 111 pages[sm=eek.gif] I had knee surg. on tuesday so with my foot in the air and butt in the chair what else is a guy suppose to do?
In a monumental effort to get "caught up" on the build and fly, I have just finished reading all 111 pages[sm=eek.gif] I had knee surg. on tuesday so with my foot in the air and butt in the chair what else is a guy suppose to do?
Perhaps a award is needed[8D] Lucikly after reading the whole thread I have aquired a mental index and have a general idea where everything is and it don't take nearly as long to find what I need. Whats crazy is after 114 pages I still have questions.
#3423
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RE: Extreme Flight 87" Yak 54 - Build & Fly
Anyone using a spinner less than 4"? Is there a fitment issue with the props fitting.......seems like a few ounces could be saved using a 3 or 3.5" and it would be more scale to boot.
=Joel
=Joel
#3424
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RE: Extreme Flight 87" Yak 54 - Build & Fly
does anyone have a opinion on using a mini servo for the throttle... I have been told be a experienced flyer the their will be to much vibration... eg a hitec hs81mg servo. any opinions on this.
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RE: Extreme Flight 87" Yak 54 - Build & Fly
ORIGINAL: meatman
does anyone have a opinion on using a mini servo for the throttle... I have been told be a experienced flyer the their will be to much vibration... eg a hitec hs81mg servo. any opinions on this.
does anyone have a opinion on using a mini servo for the throttle... I have been told be a experienced flyer the their will be to much vibration... eg a hitec hs81mg servo. any opinions on this.