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Extreme Flight 87" Yak 54 - Build & Fly

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Extreme Flight 87" Yak 54 - Build & Fly

Old 10-16-2005, 09:37 PM
  #6201  
wgeffon
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: RVBlack

You figured out the wing loading on that Yak a page ago can you tell me how you did it? RV

Easy.
Go here
http://www.gsal.org

On the left under tools is a WL calculator
Old 10-16-2005, 09:40 PM
  #6202  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Wayne..If I got no job I got no planes![:@]


Can you remember what kinda throw you have for 3d flying? Just tring to get an idea on what to shoot for..
Old 10-16-2005, 09:56 PM
  #6203  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Wing loading equals weight (in lbs) divided by wing area (in sq-in) multiplied by 2,304. This will give you ozs/sq ft.

On another note... how far forward can you mount the motor to help out with CG (as well as make it more scale).\
How do I get on the long long list?
Old 10-16-2005, 10:23 PM
  #6204  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: Josey Wales

Can you remember what kinda throw you have for 3d flying? Just tring to get an idea on what to shoot for..
Off hand I dont know but I do know its set up per the manual in degrees of travel for each surface for 100%
Old 10-16-2005, 10:25 PM
  #6205  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Ok thats what I was going by..Thanks
Old 10-16-2005, 11:30 PM
  #6206  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

You figured out the wing loading on that Yak a page ago can you tell me how you did it? RV
Here's another wing loading calculator
http://www.lcrcc.net/thrust_calc.htm
Old 10-17-2005, 08:23 AM
  #6207  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Why is everyone ignoring me? Do I anger you?
Old 10-17-2005, 08:39 AM
  #6208  
wgeffon
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: sillyness

Why is everyone ignoring me? Do I anger you?

LOL.. Missed your question.
(was it about the motor placement?)

3" standoffs is what I am using with the DA. That seems to get the CG very close. You can move the cowl back a little to have the motor to appear to stick out further forward. That will actually help with getting more air into the cowl and help with prop efficiency.
There was a big discussion about this in the QQ 85" Yak thread.
Old 10-17-2005, 09:03 AM
  #6209  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: wgeffon

Rv,

With that motor on the Yak plan on the plane being just shy of 18 pounds.
With that being said, your wing loading will be around 28.5 oz/sqft. Not bad but not like the amazing wing loading of 24 that we are seeing with this plane.

Nobody says you have to have a DA in this plane. Use what you have and have fun.

according to the wing loading program that you guy's sent me my edge is 36.6, and the yak will be 29.4 if the yak comes in @18.5lbs. with my 3W 60 on it, what a difference. Now my hanger9 33% extra with a da 100 on it come's in at 26lbs. that's a wing load of 34.2 why is my extra such a floater if it has such a high wing load? RV
Old 10-17-2005, 09:06 AM
  #6210  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: wgeffon


ORIGINAL: sillyness

Why is everyone ignoring me? Do I anger you?

LOL.. Missed your question.
(was it about the motor placement?)

3" standoffs is what I am using with the DA. That seems to get the CG very close. You can move the cowl back a little to have the motor to appear to stick out further forward. That will actually help with getting more air into the cowl and help with prop efficiency.
There was a big discussion about this in the QQ 85" Yak thread.
Wayne, I've followed the QQ thread as well, I'm still wondering about the prop efficiency issue. I have no concrete evidence telling me that spacing the prop out further will have any appreciable effect. Have you compared your plane, which I assume the prop is spaced 15/16 from the cowl (correct??), to a plane with the book set up of 7/16? If so, what is your evaluation?

I'm not opposed to putting more space between my cowl and prop, However I'm running the stock muffler and I'll have to cut the cowl so the muffler will clear. If necessary, I'll Add 1/4 inch to the standoffs and machine a 1/4 prop spacer.

john
Old 10-17-2005, 10:45 AM
  #6211  
coche
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: RVBlack


ORIGINAL: wgeffon

Rv,

With that motor on the Yak plan on the plane being just shy of 18 pounds.
With that being said, your wing loading will be around 28.5 oz/sqft. Not bad but not like the amazing wing loading of 24 that we are seeing with this plane.

Nobody says you have to have a DA in this plane. Use what you have and have fun.

according to the wing loading program that you guy's sent me my edge is 36.6, and the yak will be 29.4 if the yak comes in @18.5lbs. with my 3W 60 on it, what a difference. Now my hanger9 33% extra with a da 100 on it come's in at 26lbs. that's a wing load of 34.2 why is my extra such a floater if it has such a high wing load? RV

it might be tail heavy!
Old 10-17-2005, 05:06 PM
  #6212  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: RVBlack


Now my hanger9 33% extra with a da 100 on it come's in at 26lbs. that's a wing load of 34.2 why is my extra such a floater if it has such a high wing load? RV
RV,

I am not trying to sound harsh but a 100cc plane with a WL of 34.2 isnt really a floater. Is it the first big plane you have flown or have you flown a truely lightly loaded plane? Say something under 27 oz/sqft?
Like I said, this is not meant to be an attack. I am truely just wondering.

Old 10-17-2005, 05:09 PM
  #6213  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: jrjohn


Wayne, I've followed the QQ thread as well, I'm still wondering about the prop efficiency issue. I have no concrete evidence telling me that spacing the prop out further will have any appreciable effect. Have you compared your plane, which I assume the prop is spaced 15/16 from the cowl (correct??), to a plane with the book set up of 7/16? If so, what is your evaluation?
No I havent done that. I am just going by what I have heard QQ say. I have a firm belief that he is a lot smarter than me when it comes to that stuff.
Old 10-17-2005, 05:50 PM
  #6214  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I also like the looks of it... with the prop pushed back against the cowl I think it looks like a GeeBee... with it pushed WAY forward I think it makes it look like an aerobatic machine (sometimes functionality has an ugly face).

Plus, moving 3.5 lbs forward by 1/2" gives you an added moment of 24 oz-in... this is like adding 2 oz 12" in front of the CG... helps a lot in getting her right. I just wish the wing tube was located aft by just a little bit... that would really get the CG right with less effort.
Old 10-17-2005, 05:58 PM
  #6215  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: wgeffon


ORIGINAL: RVBlack


Now my hanger9 33% extra with a da 100 on it come's in at 26lbs. that's a wing load of 34.2 why is my extra such a floater if it has such a high wing load? RV
RV,

I am not trying to sound harsh but a 100cc plane with a WL of 34.2 isnt really a floater. Is it the first big plane you have flown or have you flown a truely lightly loaded plane? Say something under 27 oz/sqft?
Like I said, this is not meant to be an attack. I am truely just wondering.

thank you for the reply. I'm wondering how I can go straight down, power at idle, 3D rate's, and pull full elevators and the plane just stop's and sink's like a feather, or land it what seem's to be 3mph. I know I'm not that good, but the plane does it for me. Now Chip Hyde is. I'll try to post some pic's of Chip hanging my extra on the prop. RV
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Old 10-17-2005, 06:13 PM
  #6216  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

OR A VERY SLOW HARRIER
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Old 10-17-2005, 06:43 PM
  #6217  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: wgeffon


ORIGINAL: jrjohn


Wayne, I've followed the QQ thread as well, I'm still wondering about the prop efficiency issue. I have no concrete evidence telling me that spacing the prop out further will have any appreciable effect. Have you compared your plane, which I assume the prop is spaced 15/16 from the cowl (correct??), to a plane with the book set up of 7/16? If so, what is your evaluation?
No I havent done that. I am just going by what I have heard QQ say. I have a firm belief that he is a lot smarter than me when it comes to that stuff.


Wayne, you have Owned and flown two Yaks now ( I think) I thought the first one had 2 1/2 inch standoffs or am I mistaken?
Old 10-17-2005, 07:35 PM
  #6218  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I tried to go to EF's web site, but had a problem. Is it down? www.extremeflightrc.com

Thanks Rick
Old 10-17-2005, 08:39 PM
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: jrjohn


Wayne, you have Owned and flown two Yaks now ( I think) I thought the first one had 2 1/2 inch standoffs or am I mistaken?
John,

I think you are right. They are the standard ones that come with the DA-50
Old 10-17-2005, 08:41 PM
  #6220  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

www.extremeflightrc.com
seems to be working for me.
Old 10-17-2005, 09:11 PM
  #6221  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: wgeffon


ORIGINAL: jrjohn


Wayne, you have Owned and flown two Yaks now ( I think) I thought the first one had 2 1/2 inch standoffs or am I mistaken?
John,

I think you are right. They are the standard ones that come with the DA-50
Wayne I'm confused, did you use 2 1/2" standoffs on the first plane and 3" on the second, or 2 1/2 inch on both planes?

John
Old 10-17-2005, 10:04 PM
  #6222  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

2.5" on both Yak's
Old 10-20-2005, 05:58 AM
  #6223  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

hello everybody,

I have a question about the Extreme Flight's Yak. It seems that it is manufactrured by Haikong, is it correct???

here is the link http://www.dghaikong.com/
Old 10-20-2005, 06:16 AM
  #6224  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

For anyone that may be interested, I just listed my Yak on the Giant scale for sale page.
Old 10-20-2005, 07:17 AM
  #6225  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: zigou

hello everybody,

I have a question about the Extreme Flight's Yak. It seems that it is manufactrured by Haikong, is it correct???

here is the link http://www.dghaikong.com/
No. That is not where they are built in China

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