OMP Razor Yak Set-up

OMP Razor Yak Set-up

PostPosted: Sun Jan 11, 2009 10:45 pm

Guys theres been alot of questions about the correct cg numbers and how to keep weight farward without adding dead weight!!

We moved the tail servos right behind the wing, as you will see in the pics to follow, mounted the battery below the motor.

Final weight came out at 6.5 pounds!! test flew it today and flew great and tracked as of it was on rails!!!!!! no tail sagging and when rolling to inverted plane would not climb or fall, only hold straight, true lines!!!!!

3-d was just as good or better than my 1st one and this one came out lighter and I feel it flys better with the main weight moved farward on the fuse!!!

For any one wanting the cg numbers i have marked the fuse and took pics of where it balanced!! the numbers range from 6 to 9 inchs and this one seems to balance around 7!!!

Bradly Petty
Attachments
DSC00238.jpg
this is the placement of the servos, the elevator is one the trustline and the rudder servos is about 1" lower
DSC00236.jpg
you have to add these blocks inside the fuse for the servo screws
DSC00237.jpg
here is how i routed the servo wires up thru the fuse to the receiver location inside the wing
DSC00240.jpg
this is weight of the push rod used with the servos in the tail
DSC00241.jpg
this is the weight of the fiberglass pushrods used when moving the servos, not much weight added!!
DSC00248.jpg
this is the end result with everything mounted!!
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PostPosted: Sun Jan 11, 2009 10:57 pm

here are a few more pics of my new Razor Yak and the cg placement pics!!

the battery i used was an 2 cell 3000mah maxamp pack that weighed about 5.5 ounces!!!

Bradley Petty
Attachments
DSC00251.jpg
cg range 6 to 9" off of leading edge of wing
DSC00252.jpg
7" where mine balanced!!!!!
DSC00249.jpg
top veiw of both push rods!!
DSC00247.jpg
One Sexy Yak!!!!
DSC00250.jpg
this is where i placed the battery!
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PostPosted: Sun Jan 11, 2009 11:06 pm

Just a suggestion. Reload your pics so they don't look like thumbnails when you click on them. There way 2 small to see anything.

I'm sure the guys having problems will appreciate your efforts.
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PostPosted: Sun Jan 11, 2009 11:58 pm

another pic of where the tail servos are located in relation to the wing...

Bradley Petty
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DSC00231.jpg
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PostPosted: Mon Jan 12, 2009 12:34 am

I can't imagine how it would fly straight & level, upright & inverted at 7", but if it works for you... shrug
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PostPosted: Mon Jan 12, 2009 8:27 am

Joker where does your's balance at?

Bradley Petty
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PostPosted: Mon Jan 12, 2009 8:48 am

clean job on the servo relocation bro! glad to hear it's better!
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PostPosted: Mon Jan 12, 2009 9:06 am

Nice job Bradley. Are you sure about the 7" CG? I thought for sure Brent said the sweet spot was 8.5".
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PostPosted: Mon Jan 12, 2009 9:08 am

im sure that plane will fly with a cg from 5-9.. it just differs on where the ass flies i guess. mine always looked like a dog kicked in the ass when flying. the tail was always lower than the wing as if it was sitting on the wheels.
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PostPosted: Mon Jan 12, 2009 9:42 am

It looks like an easy mod and now you don't need servo extensions!

Can you get to an 8" CG more easily with the servos where they were or where they are now---your guess?

R U saying yet, that when you flip your plane neutral trimmed at a 7" CG, it stays level?
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PostPosted: Mon Jan 12, 2009 10:48 am

Yes, with the fagie spinner it makes the plane balance at 7"

but with out it, it comes in around 7.5"

The tail doesnt seem to sag that bad, only at lower speeds, at 3/4 to full speed it flys nice. almost like a pattern plane

And yes the plane does hold level when rolling over to invert at full fuel 1/2 tank and at the end of the tank it will start to climb inverted

The mod was very easy, only added about one hour or more to the build and that was with taking pics and all,

Bradley Petty
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PostPosted: Mon Jan 12, 2009 7:54 pm

bpetty620 wrote:Joker where does your's balance at?

Bradley Petty


not sure exacly, but I initially balanced it at 8.5" then moved the engine back 1" to suit my taste, if I reemember right trimmed for level flight upright you still had to breathe on the elevator to keep the nose up inverted, but with the motor back an inch it flew handss off both upright & inverted...

not sure all the factors that may make mine fly straight & level at 8.5"+ & yours fly straight & level at 7" maybe someone smarter can explain... shrug

my old one was definitely tail heavy, & flying my new one, it is spot on, but it does take some of the "flippyness" (for lack of a better term) out of it, I almost like it better a little more tail heavy, but I'm a stick banger, not a precision guy...
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PostPosted: Mon Jan 12, 2009 10:56 pm

Hey bpetty What is the weight of your engine?
It looks like a os of some short
I have a new saito 100 for mine and I'm thinking of trying the mods you did with the servos.
also how is your battery plugged in
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PostPosted: Mon Jan 12, 2009 11:33 pm

75ax. ?

i'll go for tail-heavy, stick banging, over the straight line shit.
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PostPosted: Tue Jan 13, 2009 8:20 am

Chopper, my plane is weighing in at 6.5 to 6.75, the reson i say that is my good scale only goes to 5lbs, so i have to weigh ever thing apart

i am using the os 75 two stroke, the plane will fly fine more tail heavy, but some wont that nose weight. the mod was only to make the plane more neutral. witch i think makes the plane fly even better

Bradley Petty
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PostPosted: Tue Jan 13, 2009 9:28 am

chopper wrote:Hey bpetty What is the weight of your engine?

Weight: 19.4 oz (550 g) + muffler weight
Saito 100 Engine (Only) Weight:19.5 oz, Muffler Weight:1.4 oz

maybe 6 ounces heavier w/muffler than a Saito 100.

http://www.rcgroups.com/forums/showthread.php?t=711025
OS 75 ax.
Weight: 19.4 oz (My scale showed 26.8 oz suggesting that Tower's weight is without muffler
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PostPosted: Tue Jan 13, 2009 9:47 am

Thanks Pecanman i mist that question all the way around

Bradley Petty
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PostPosted: Wed Jan 14, 2009 5:41 pm

Great job Bradley!!! Keep up the good work.. I want to fly mine so bad. The weather is sooooo cold now.
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PostPosted: Sat May 09, 2009 10:04 am

btw guys, is the wing tube supposed to have a loose fit at the fuse? it seems like my wings are flopping around as the tube is not secure at the fuse.

The kit i built seemed to have the wing tube glued into the fuse.
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PostPosted: Sat May 09, 2009 10:51 am

mine's snug. maybe wrap some tape around the tube to tighten it up.


weighed mine. its a tank.
7.25LBS, dry !!

saito 100
13oz hayes
fut 3305's
williams gear
2300 a123 under tank to balance
cg around 9"
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