RE: QQ 85" Yak  
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RE: QQ 85" Yak - 9/20/2005 5:02:08 PM   
bpryor



Posts: 1692
Joined: 11/30/2001
From: Hillsboro, OR, USA
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quote:

ORIGINAL: bbuzzone

Bill

Here's the 85" QQ landing gear dimensions:

A = 7 1/2 "
B = 9 1/16"
C = 15/16"
D = 1 7/16"

The gear (width, D) is a snug fit on my QQ). The other dimension that I've had to provide when requesting custom gear to be made is the distance from the center line (mounting surface, D) to the center of the axle, this allows you to calculate the gear angle. For this gear, that distance is 3/4".

Buzz


Hi Buzz,

Thank you, thank you, thank you...but I need one more dimension from you. The "C" dimension is actually the distance between the axles, which should be about 20-22". I assume what you gave me is the width at the axle, which is also helpful info that I'll include.

quote:

ORIGINAL: bbuzzone
is the distance from the center line (mounting surface, D) to the center of the axle, this allows you to calculate the gear angle. For this gear, that distance is 3/4".


Yes, that would be a worthwhile dimension. I was asking for measurement from the front of the gear at the top to the front of the gear at the bottom, but your measurement for that angle actually makes more sense. I should be able to figure it out from that though with the width of the top of the gear and the width of the bottom.

Also, one more question. Is there any more room where the gear mounts. In other words at the 1 7/16" dimension, is there room for the gear to be any wider and still fit in the slot in the fuse?

**Forget that question, I didn't read carefully enough and you already gave that to me. Darn, everything else so far has been close, but I think that will be too much difference to make just one set of gear that includes the QQ Yak. Of course if they make it wider at that dimension, it wouldn't be very hard to open up the mounting area to make it fit, but most people probably wouldn't want to do this. Anyway, I'm just providing all the dimensions, if Graph Tech desides to make multiple Yak versions, that of course will be up to him.

Thanks again.


< Message edited by bpryor -- 9/20/2005 6:35:40 PM >

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Bill Pryor

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       Post #: 126

RE: QQ 85" Yak - 9/20/2005 10:27:53 PM   
bbuzzone



Posts: 54
Joined: 12/8/2003
From: Land O' Lakes, FL, USA
Status: offline 		Bill,

See what happens when your rushing out to shop, building a plane, and trying to find a job! At least I'll accomplish 2 of the 3. Besides, a job would just get in the way of flying.

The correct C dimension is 20". Also, agree with your conclusion that if the gear doesn't fit without modifications it isn't going to sell.

Good luck, it would be nice to have some graphite gear for this - and my TOC - Yak.

Buzz

< Message edited by bbuzzone -- 9/20/2005 10:28:51 PM >

(in reply to bpryor)
       Post #: 127

RE: QQ 85" Yak - 9/20/2005 11:02:43 PM   
bpryor



Posts: 1692
Joined: 11/30/2001
From: Hillsboro, OR, USA
Status: offline
quote:

ORIGINAL: bbuzzone

Bill,

See what happens when your rushing out to shop, building a plane, and trying to find a job! At least I'll accomplish 2 of the 3. Besides, a job would just get in the way of flying.

The correct C dimension is 20". Also, agree with your conclusion that if the gear doesn't fit without modifications it isn't going to sell.

Good luck, it would be nice to have some graphite gear for this - and my TOC - Yak.

Buzz



Hi Buzz,

No problem, I just appreciate you taking the time to get back to me with this info. I am now complete, except for the BME, but I don't think there's a need since the stock semi-scale FG gear is probably a good enough solution as long as they turn out to be strong enough.

Thanks again. I'll post the table of all the measurements soon.

< Message edited by bpryor -- 9/21/2005 1:01:09 AM >

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Bill Pryor

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       Post #: 128

RE: QQ 85" Yak - 9/20/2005 11:11:38 PM   
bpryor



Posts: 1692
Joined: 11/30/2001
From: Hillsboro, OR, USA
Status: offline 		OK, in case anyone is interested, here are the results of my landing gear measurement hunt. Thanks to the people that took the time to help me/you out.

See the image below:

Attachments
Click to see fullsize image.
Click for fullsize


< Message edited by bpryor -- 9/20/2005 11:23:55 PM >

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Bill Pryor

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RE: QQ 85" Yak - 9/21/2005 5:24:56 PM   
racer8297


 

Posts: 328
Joined: 3/31/2003
From: Macungie, PA, USA
Status: offline 		What are you guys doing with the wing socket area on the fuse? Do you cut the covering off even with the opening or do you iron it back onto the foam inside?


(in reply to bpryor)
       Post #: 130

RE: QQ 85" Yak - 9/21/2005 5:43:37 PM   
bbuzzone



Posts: 54
Joined: 12/8/2003
From: Land O' Lakes, FL, USA
Status: offline 		Racer, consider this one vote for ironing it back about 1/16". I haven't noticed any binding with this, but I've only dry fit the wings at this point. I'm working on the wings at this moment.

Buzz

(in reply to racer8297)
       Post #: 131

RE: QQ 85" Yak - 9/21/2005 5:51:46 PM   
Ted5660


 

Posts: 48
Joined: 4/17/2004
From: Oshawa, ON, CANADA
Status: offline 		Racer

Me too. I ironed the covering back into the cutouts on all the openings - servos also.

Ted

(in reply to racer8297)
       Post #: 132

RE: QQ 85" Yak - 9/21/2005 7:51:47 PM   
racer8297


 

Posts: 328
Joined: 3/31/2003
From: Macungie, PA, USA
Status: offline 		Ok, thanks guys. That's what I thought!


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       Post #: 133

RE: QQ 85" Yak - 9/22/2005 2:00:46 AM   
racer8297


 

Posts: 328
Joined: 3/31/2003
From: Macungie, PA, USA
Status: offline 		Actually, I have two more questions. About the wood engine mounting standoffs. Are they to be glued to the firewall or do they just get tightened between the engine and the fire wall like an aluminum standoff?

Second, the firewall seems awfully thin to me. Are you guys adding a layer of plywood in front of it?

TIA,
Jim

(in reply to racer8297)
       Post #: 134

RE: QQ 85" Yak - 9/22/2005 3:03:06 AM   
Ted5660


 

Posts: 48
Joined: 4/17/2004
From: Oshawa, ON, CANADA
Status: offline 		I glued the standoffs to the firewall. I didn't add anything to the thickness of the firewall, I thought it looked fine the way it was, It is a good quality wood and it is interlocked into the structure. I did add fender washers however under the heads of the bolts. I am using a DA 50 engine.

Now I have a question: On the DA 50 did anyone put a servo on the choke? Did you do anything about the detent?


Ted

(in reply to racer8297)
       Post #: 135

RE: QQ 85" Yak - 9/22/2005 4:08:23 AM   
RCAddiction



Posts: 903
Joined: 3/29/2002
From: Waxhaw, NC, USA
Status: offline 		Yup, the DA50 can be a pain to do a choke servo. The combination of the strong detent plus the short choke arm is not good for a servo to drive.

CHOKE ARM EXTENSION
Here's what I do. I make up a simple extension for the choke arm. It provides good leverage so that a standard HS-425 has no problem to open/close it. I've done this on a BME 44 and my other DA50 as well. In the photo, you'll see that I modify a Hitec Karbonite servo arm. It's actually a leftover scrap from one of the doublesided long arms I used for the elevator or aileron. I notched out the back side so that it slides onto the brass shaft's diameter. Then I drill a hole through it for a 4-40 bolt, with a washer under the head. There's a 4-40 locknut (nylok style Nelson nut) on the underside of the arm. It's locked in between the brass shaft and the 4-40 bolt so it cannot rotate and is tightly secured and vibration-proof. If you use the Hitec Karbonite arm for this, the center of the arm is raised, and you should sand it flat so that it fits well. You can also do something like this with the red plus-sign shaped Hitec servo arms, using the thick arm.

I hope you find it helpful.

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Lee

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RE: QQ 85" Yak - 9/22/2005 4:11:36 AM   
RCAddiction



Posts: 903
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From: Waxhaw, NC, USA
Status: offline 		PEACEKEEPER MUFFLER
It arrived today, so I very quickly got it installed and cut the cowl! The installation is a bit better than the Slimline, IMHO. The muffler is smaller in diameter and narrower, so it is not as obtrusive. I'm a little disappointed that the tubes are 5/8" diameter and not 3/4" like the Slimline, so I hope they are not going overly restrictive, reducing power output. I'll find out, I'm sure!

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Lee

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RE: QQ 85" Yak - 9/22/2005 4:38:32 AM   
wgeffon



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Joined: 12/2/2001
From: Bloomington, IL, USA
Status: offline 		Lee,

When do I get to wring that bad boy out??


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Wayne

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