Aviation Models 37.5% Yak 54 Build Thread #2
03-16-2006, 11:09 PM
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Aviation Models 37.5% Yak 54 Build Thread #2
Here is the link for thread #1: http://www.rcuniverse.com/forum/m_3492671/tm.htm
Dkjens did a nice job putting his together but i wanted to start a new thread and try to shed more light in some areas
that I thought he didn't cover as much as I'd liked. Specifically the engine compartment and the choice of headers and canisters.
Also I'd like to talk about my choices as far as servos, batteries, etc
Before I get into that I'd like to echo his impression of the model right out of the box. The packaging is first rate and while you pull things
out of the crate and out of their individual boxes you left with the impression that the people that packaged this thing took their time and did
it right. Everything is neatly bubble wrapped, placed in individual bags and then in separate carton boxes with additional foam inside them
to help cushion things further. Unless someone drives his 18 wheeler over the wooden crate 'by accident' I don't see how things can arrive
at someone's door damaged.
The model itself is spectacular. Very nicely done. I've seen a bunch of 40% kits in the imac circuit put together by very skillful people that
take pride in their workmanship and I personally both admire and envy. This 37.5% Aviation Models Yak looks like it has been build by one
of those people. I kid you not. I looked hard to find proof that this ARF has been put together by people in a hurry to complete it and move
on, I looked for sloppiness, I looked for oozing glue, I looked for gaps between the wood pieces where there shouldn't be, I looked for
defects in the covering or the paint. I couldn't find anything wrong or anything to frown upon. This thing is an ARF on paper but it might as
well be a professionally build kit. The value for people like me with small kids, and overall busy schedules is apparent.
Which brings me to another thing i want to mention. I have this model in my basement for a while now. But combining the fact that a have
a couple of small kids in the house, parents visiting for a couple of months from overseas, and being particularly busy at work and the result
is that I put but a fraction of the time into it that I had hoped for when I first got it. In other words it should have been completed a while
ago but i just now finished with the engine and exhaust installation.
Hopefully this thread and also the improving weather in NJ will motivate me to make the time and complete this soon.
Anyway, let's get right to it:
I'll be using a DA 150 for power and it turns out that the 110 regular(not the K) MTW cannisters and the stainless steel flex headers with the
smallest drop available is what needed for this model. I don't remember the drop in mm but i believe there are 3 sizes. You need the smallest.
Also Brian form DA told me that the headers work best with these cannisters within an inch, up or down, of 10.5" header length. In other
words I could have cut the headers down to 9.5" without any penalties in performance. It turns out that 10.5" of header length while the
engine is on a 1" standoffs is just enough for the outlet of the cannister to clear the gear plate and cowl ring.
I used the single cannister holders that DA sells and trimmed them down to fit inside the tunnel:
Dkjens did a nice job putting his together but i wanted to start a new thread and try to shed more light in some areas
that I thought he didn't cover as much as I'd liked. Specifically the engine compartment and the choice of headers and canisters.
Also I'd like to talk about my choices as far as servos, batteries, etc
Before I get into that I'd like to echo his impression of the model right out of the box. The packaging is first rate and while you pull things
out of the crate and out of their individual boxes you left with the impression that the people that packaged this thing took their time and did
it right. Everything is neatly bubble wrapped, placed in individual bags and then in separate carton boxes with additional foam inside them
to help cushion things further. Unless someone drives his 18 wheeler over the wooden crate 'by accident' I don't see how things can arrive
at someone's door damaged.
The model itself is spectacular. Very nicely done. I've seen a bunch of 40% kits in the imac circuit put together by very skillful people that
take pride in their workmanship and I personally both admire and envy. This 37.5% Aviation Models Yak looks like it has been build by one
of those people. I kid you not. I looked hard to find proof that this ARF has been put together by people in a hurry to complete it and move
on, I looked for sloppiness, I looked for oozing glue, I looked for gaps between the wood pieces where there shouldn't be, I looked for
defects in the covering or the paint. I couldn't find anything wrong or anything to frown upon. This thing is an ARF on paper but it might as
well be a professionally build kit. The value for people like me with small kids, and overall busy schedules is apparent.
Which brings me to another thing i want to mention. I have this model in my basement for a while now. But combining the fact that a have
a couple of small kids in the house, parents visiting for a couple of months from overseas, and being particularly busy at work and the result
is that I put but a fraction of the time into it that I had hoped for when I first got it. In other words it should have been completed a while
ago but i just now finished with the engine and exhaust installation.
Hopefully this thread and also the improving weather in NJ will motivate me to make the time and complete this soon.
Anyway, let's get right to it:
I'll be using a DA 150 for power and it turns out that the 110 regular(not the K) MTW cannisters and the stainless steel flex headers with the
smallest drop available is what needed for this model. I don't remember the drop in mm but i believe there are 3 sizes. You need the smallest.
Also Brian form DA told me that the headers work best with these cannisters within an inch, up or down, of 10.5" header length. In other
words I could have cut the headers down to 9.5" without any penalties in performance. It turns out that 10.5" of header length while the
engine is on a 1" standoffs is just enough for the outlet of the cannister to clear the gear plate and cowl ring.
I used the single cannister holders that DA sells and trimmed them down to fit inside the tunnel:
03-16-2006, 11:14 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
After the back holders were in place and the headers secured on the engine there was little movement of the canisters.
But I felt i needed some more support in the front to at least prevent them from hitting the edge of the tunnel.
The fit is a bit too tight in the front exit of the tunnel and I was afraid that in high G moves the canisters might rub on the
wood. These small cushion pieces i added will prevent this from happening:
But I felt i needed some more support in the front to at least prevent them from hitting the edge of the tunnel.
The fit is a bit too tight in the front exit of the tunnel and I was afraid that in high G moves the canisters might rub on the
wood. These small cushion pieces i added will prevent this from happening:
03-16-2006, 11:20 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
I'll be wraping the flex part of the headers with teflon tape before everything is said and done.
Here are a couple of pictures of the standoffs:
Here are a couple of pictures of the standoffs:
03-16-2006, 11:31 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Some pictures of the cowl fit. I'm worried a bit about the engine getting hot. There is no direct airflow over the top end of the cylinders.
But there are a couple of guys that I know off, Dkjens included, that fly this in warmer areas than where I am and there are no issues so I guess it should
be ok. I'll be checking the temps just in case though and if there is a need it shouldn't be hard to construct a baffling system that will direct
air to the end of the cilinders. Also you can see the opening in the cowl that needs to be made on the left side.
No big deal. There is a rumor that the new batch of these came with improved cowls that eliminated the need to do this.
I'll need to place a call to Sammy and confirm:
But there are a couple of guys that I know off, Dkjens included, that fly this in warmer areas than where I am and there are no issues so I guess it should
be ok. I'll be checking the temps just in case though and if there is a need it shouldn't be hard to construct a baffling system that will direct
air to the end of the cilinders. Also you can see the opening in the cowl that needs to be made on the left side.
No big deal. There is a rumor that the new batch of these came with improved cowls that eliminated the need to do this.
I'll need to place a call to Sammy and confirm:
03-16-2006, 11:41 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Another picture of the cowl, an inside the fuse picture showing the area i'll be working next and another picture
showing the reason i had to cut this night's work short
showing the reason i had to cut this night's work short
03-16-2006, 11:49 PM
#6
RE: Aviation Models 37.5% Yak 54 Build Thread #2
Hi Stratos, glad to see another build thread started.
Yes there is No cooling over the Cyl, I cut the cowl out on the front lip directly in front of the heads...this helped a great deal..
I will look for a picture...
I did a build thread but the web site I did it on got shut down, and I just couldnt bring myself to do another...
Here is my build vid though... http://www.donalds-hobby.com/video/YakBuild.wmv
Let me know if you have any questions...
Yes there is No cooling over the Cyl, I cut the cowl out on the front lip directly in front of the heads...this helped a great deal..
I will look for a picture...
I did a build thread but the web site I did it on got shut down, and I just couldnt bring myself to do another...
Here is my build vid though... http://www.donalds-hobby.com/video/YakBuild.wmv
Let me know if you have any questions...
03-17-2006, 12:18 AM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Darcy,
That picture of the cowl will help a lot. Believe it or not you were 1 of the 2 i was counting as the people with no problems flying it like this.
I guess my instinct was correct and airflow over the cylinders is an issue. The good news is that the cowl in that front area is pretty stiff
so opening it up shouldn't be an issue as far as structural integrity is concerned. I'll be looking forward for that picture of your cowl.
Thanks for the heads up.
Stratos.-
That picture of the cowl will help a lot. Believe it or not you were 1 of the 2 i was counting as the people with no problems flying it like this.
I guess my instinct was correct and airflow over the cylinders is an issue. The good news is that the cowl in that front area is pretty stiff
so opening it up shouldn't be an issue as far as structural integrity is concerned. I'll be looking forward for that picture of your cowl.
Thanks for the heads up.
Stratos.-
03-17-2006, 07:17 AM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Hi Stratos. Looking excellent! I do believe the next shipment of these will have the redesigned cowl making the cutout for the left ignition boot a thing of the past. Maybe the redesigned cowl will have a larger front opening too allowing more airflow over the top of the cylinders. If not, like Darcy said, it should be easy enough to mod. After seeing Darcy's and Jen's vids on these, I can't wait to get one in the air. I have heard Darcy has over 200 flights on his and last I heard it was still going strong.
I am looking forward to the rest of your build thread. Maybe you and Paul can make a road trip up to our field this summer and we can get a group shot of the Aviation Models Yaks! There will be be about 8 of them in various sizes in our club alone this summer! Take care, Craig
I am looking forward to the rest of your build thread. Maybe you and Paul can make a road trip up to our field this summer and we can get a group shot of the Aviation Models Yaks! There will be be about 8 of them in various sizes in our club alone this summer! Take care, Craig
03-17-2006, 12:52 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Hey Stratos,
Good to see you building this plane. You are showing very nice pictures of the headers/canisters install, where it's important to get just the right items for it to fit. I had Darcy cut a couple of smilies in my cowl on his recent visit out here for better cooling. There has only been one maneuver where I have felt the engine got a little warm, and that is in a sustained upright flat spin. I can put mine in this flat spin and maintain or slowly gain altitude, but it takes full throttle, and after a while I think I hear the engine bog slightly, and I get out of it. For normal IMAC style or 3D flying, I haven't noticed overheating, but I haven't flown it in really hot weather yet.
Mine is the same scheme as yours, and although I may like Darcy's scheme better, yours and my schame is much easier to see in the air. I flew Darcy's, and it's so white on the bottom it can be quite hard to see. This can be bad or it can be good, because the judges can't see it either he he.
When you put your main gear and wheels on, check your wheel allignment. I think they often come with a bit of toe out on at least one of the wheels, it would serve you well to bend the gear into allignment before taking it out flying. You'd be surprised how fast you can wear down those wheels/tires with toe out.
Oh, and mine is seeing some more action this weekend, Sunday is a funfly at one of the local fields, gotta whooooo the crowd he he.
DKjens
Good to see you building this plane. You are showing very nice pictures of the headers/canisters install, where it's important to get just the right items for it to fit. I had Darcy cut a couple of smilies in my cowl on his recent visit out here for better cooling. There has only been one maneuver where I have felt the engine got a little warm, and that is in a sustained upright flat spin. I can put mine in this flat spin and maintain or slowly gain altitude, but it takes full throttle, and after a while I think I hear the engine bog slightly, and I get out of it. For normal IMAC style or 3D flying, I haven't noticed overheating, but I haven't flown it in really hot weather yet.
Mine is the same scheme as yours, and although I may like Darcy's scheme better, yours and my schame is much easier to see in the air. I flew Darcy's, and it's so white on the bottom it can be quite hard to see. This can be bad or it can be good, because the judges can't see it either he he.
When you put your main gear and wheels on, check your wheel allignment. I think they often come with a bit of toe out on at least one of the wheels, it would serve you well to bend the gear into allignment before taking it out flying. You'd be surprised how fast you can wear down those wheels/tires with toe out
.Oh, and mine is seeing some more action this weekend, Sunday is a funfly at one of the local fields, gotta whooooo the crowd he he.
DKjens
05-26-2006, 09:33 AM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Is anyone running 2 aileron and 1 elevator servos. I am thinking of running 5995TG on 7.4V.
If someone is doing this let me know how it is holding up.
Thanks,
If someone is doing this let me know how it is holding up.
Thanks,
06-04-2006, 09:02 AM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Hey guy's,
I have the 35% YAK, utilizing a 100 cc ZDZ. Are any of you guy's using cooling baffles on this airplane ( YAK)? RC Showcase is telling me that i have to use a baffle to keep it cool( engine). From reading the forums on this plane, no one seems to be having any problems with cooling. At least i havn't read it anywhere. You guy's who are flyingn the 33-35- or 37.5% YAK, please let me know what your experiences have been and what your setup is.
Ron
I have the 35% YAK, utilizing a 100 cc ZDZ. Are any of you guy's using cooling baffles on this airplane ( YAK)? RC Showcase is telling me that i have to use a baffle to keep it cool( engine). From reading the forums on this plane, no one seems to be having any problems with cooling. At least i havn't read it anywhere. You guy's who are flyingn the 33-35- or 37.5% YAK, please let me know what your experiences have been and what your setup is.
Ron
06-04-2006, 09:57 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Ron,
On my 37.5% Yak, DA150 Sala tuned engine, Biela30x10 on the biggest JMB cans, the only time i noticed the signs of overheating, was in a sustained high power flat spin. One of those flat spins where you're trying to find the sweet spot for ailerons and elevator, to stop the descend. I cut smiley faces in the edge of the cowl in front of each cylinder to get more air over the heads.
DKjens
On my 37.5% Yak, DA150 Sala tuned engine, Biela30x10 on the biggest JMB cans, the only time i noticed the signs of overheating, was in a sustained high power flat spin. One of those flat spins where you're trying to find the sweet spot for ailerons and elevator, to stop the descend. I cut smiley faces in the edge of the cowl in front of each cylinder to get more air over the heads.
DKjens
06-10-2006, 08:39 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
can I get some measurements of the 37.5? Length from tail end of rudder to tip of spinner, and from the ground to top of rudder? For some reason the measurements on AMs website are always off, thanks!
06-10-2006, 10:06 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
DK,
Thanks for the info, it has come in handy. I spoke with a factory rep from Aviation models. he indicated that i should open up the bottom of the cowl at the rectangular area that sticks down at the rear( of the cowl). He seemed to think that it was all that was necessary to keep the engine cool.
Ron
Thanks for the info, it has come in handy. I spoke with a factory rep from Aviation models. he indicated that i should open up the bottom of the cowl at the rectangular area that sticks down at the rear( of the cowl). He seemed to think that it was all that was necessary to keep the engine cool.
Ron
08-26-2006, 10:53 AM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Whats the flying weight everyone is getting?
Is this reallly a 3d monster?
Is the issue with wings resolved?
Hoby
Is this reallly a 3d monster?
Is the issue with wings resolved?
Hoby
08-26-2006, 03:45 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Thanks Craig
WHat motor is in it?
What is your set up?
I have the 33% am yak with a zdz 80 super and it rocks.
I cant believe anything else would fly any better!
WHat motor is in it?
What is your set up?
I have the 33% am yak with a zdz 80 super and it rocks.
I cant believe anything else would fly any better!
08-28-2006, 05:44 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Hoby, mine has a DA150 standard mufflers. all JR 8611's with the exception of the rudder which has a Seiko. Fromeco packs throughout. It does fly sweet. Let me know if you have any other questions. Craig
p.s. to answer the question in your email the stab is 51" across and the fuse is 111" from rudder to front of prop
p.s. to answer the question in your email the stab is 51" across and the fuse is 111" from rudder to front of prop
08-28-2006, 07:37 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Thanks
My trailer is a 5x10.
WOuld be a tight fit.
How about you fly your yak at the sharks field and I wiill see if it fits ha!
DOes the da have plenty of power?
THanks
Hoby
My trailer is a 5x10.
WOuld be a tight fit.
How about you fly your yak at the sharks field and I wiill see if it fits ha!
DOes the da have plenty of power?
THanks
Hoby
08-28-2006, 10:59 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
My AM 37.5% Yak 54 with
3W 157 standard muffler, powerful engine
EMCO DPSI with 2 4800maH LiPo
Hitec 5945 all around, it ok for elevator(2 each half) and Ail(3 each half), but three 5945 seems not enough for rudder,blow back when KE and tail wag when high speed straight lever,be ging to replace with 5955TG
3W 157 standard muffler, powerful engine
EMCO DPSI with 2 4800maH LiPo
Hitec 5945 all around, it ok for elevator(2 each half) and Ail(3 each half), but three 5945 seems not enough for rudder,blow back when KE and tail wag when high speed straight lever,be ging to replace with 5955TG
08-29-2006, 07:07 AM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Hoby, the rudder removes by simply pulling a piece of music wire which would give you plenty of room. I have gone to flyins with a friend in a short wheel base minivan and have removed it for the trip. Just a couple extra minutes of assembly/disassembly as you have to disconnect the pull-pull.
As far as power goes, the DA is way more then enough. I have flown a 48 3/4 lb plane on a DA 150 and it accelerated vertically out of a hover (albeit not rocketlike) so this plane at 10 lbs lighter seems ballistic. I am sure with a 157 it is crazy power.
If you like your 33%, I really wish you could fly my 37.5% As nice as the 33% flies, this one just makes everything seem easier and smoother.
Craig
As far as power goes, the DA is way more then enough. I have flown a 48 3/4 lb plane on a DA 150 and it accelerated vertically out of a hover (albeit not rocketlike) so this plane at 10 lbs lighter seems ballistic. I am sure with a 157 it is crazy power.
If you like your 33%, I really wish you could fly my 37.5% As nice as the 33% flies, this one just makes everything seem easier and smoother.
Craig
09-06-2006, 02:52 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
CRAIG
ITS THE HORIZONTAL STAB THAT CONCERNS ME.
MY TRAILER OPENING IS 45 INCHES WIDE BUT INSIDE IT LIKE 59 INCHES
THIS PROBABLY STANDARD TO TILT THE FUSALAGE 45 DEGREES SO THE STAB CLEARS THE OPENING.
THANKS FOR THE MEASUREMENTS
HOBY
ITS THE HORIZONTAL STAB THAT CONCERNS ME.
MY TRAILER OPENING IS 45 INCHES WIDE BUT INSIDE IT LIKE 59 INCHES
THIS PROBABLY STANDARD TO TILT THE FUSALAGE 45 DEGREES SO THE STAB CLEARS THE OPENING.
THANKS FOR THE MEASUREMENTS
HOBY
09-06-2006, 03:57 PM
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RE: Aviation Models 37.5% Yak 54 Build Thread #2
Of course you can always remove the horizontal stabs while transporting and simply bolt them on when you arrive at the field. That's what I do since I cart two of them in my trailer.
Gerry
Gerry
05-20-2014, 04:24 AM
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Looking for a replacement cowl for Aviation Models 37.5% Yak...I have plane #30 which leads me to believe this is from the first production run. I've owned is since new. Any help would be appreciated thanks. Color scheme is not an issue.
