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RE: 40% 260 on a Diet - 1/18/2007 2:45 AM   
260 Man


 

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quote:

ORIGINAL: as722

So are you saying that you put the whole airplane together, wings, stabs etc. and it balances at 2.5" behind F-2 or are you saying that your fuse balances at 2.5" behind F-2 ?

Albert
quote:

ORIGINAL: sensei

Albert,

The recommended C/G is 11.3" behind F2 and this thing balances at 2.5" behind F2 equaling 8.8" in front of the C/G as it sits Ok, there is 1 LB 12 ozs. in tail feathers, servos and hardware at 60" behind the C/G; moving the C/G aft about 8.00" Because of the project target weight and power plant choice, the aft portion of the fuse had to be fabricated very light or the recommended C/G would have been unattainable without led in the nose; killing the target weight in the first place. Remember that 60" arm is very sensitive to the C/G.

Bob






Albert,

At the point of discussion, there were not horizontal stabs on the aircraft, no wings, just rudder and vertical fin (Fuse). The motor, ignition, and throttle servo were installed as well as spinner and prop, cowl, and canopy. See the photo..........

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RE: 40% 260 on a Diet - 1/18/2007 3:36 AM   
as722


 

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Status: offline 		No I don't see stabs on that photo but this is what you said.

"No, like I said, 2.5" behind F2 where the cowling meets the fuse, also with the 4 servos in the tail and the horizontal stab in place, along with batteries behind the canopy this will be a stroll in the park".


I guess I assumed the stabs were in place because you said they were.

Albert



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RE: 40% 260 on a Diet - 1/18/2007 3:39 AM   
as722


 

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RE: 40% 260 on a Diet - 1/18/2007 4:21 AM   
bzrogers



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quote:

ORIGINAL: as722

No I don't see stabs on that photo but this is what you said.

"No, like I said, 2.5" behind F2 where the cowling meets the fuse, also with the 4 servos in the tail and the horizontal stab in place, along with batteries behind the canopy this will be a stroll in the park".


I guess I assumed the stabs were in place because you said they were.

Albert





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RE: 40% 260 on a Diet - 1/18/2007 6:06 AM   
Kaos1964


 

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Status: offline 		An otherwise really interesting thread has moved towards the ridiculous.

Albert, there's no doubt you do great work and have built many Cardens - thus your selection by Dennis to build one of the 300 prototypes - I have nothing but respect for your capabilities.

Does this have to be a pis$ing contest? This is pushing the envelope, could work, could fail - I'm keenly interested in the outcome and would love to see the pointless debate removed from the discussion and just sit back and watch the facts unfold.

Ok, I'm done.

Respectfully,

Bob



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RE: 40% 260 on a Diet - 1/18/2007 6:49 AM   
260 Man


 

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Status: offline 		Tonight Bob started on the wings.. Before installing servos rails or cutting anything each foam panel came in at 15.3 oz............. More photos to come as he progresses..



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RE: 40% 260 on a Diet - 1/18/2007 5:09 PM   
RickP



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quote:

ORIGINAL: RC_Pattern_Flyer
BUT... if it flys great, makes weight, balances where it should, i bet no one has the balls to admit they were wrong.


Well,
No doubt the aiplane will fly - looking at the pictures we can be sure of that because it looks like good quality work. however, if it flys poorly due to tail twisting and other unmeasurable characteristics - will we get an honest report of it flying poorly?
RickP

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RE: 40% 260 on a Diet - 1/18/2007 11:45 PM   
as722


 

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quote:

ORIGINAL: bzrogers

Can't you find something better to do?

quote:

ORIGINAL: as722

No I don't see stabs on that photo but this is what you said.

"No, like I said, 2.5" behind F2 where the cowling meets the fuse, also with the 4 servos in the tail and the horizontal stab in place, along with batteries behind the canopy this will be a stroll in the park".


I guess I assumed the stabs were in place because you said they were.

Albert







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RE: 40% 260 on a Diet - 1/19/2007 12:01 AM   
as722


 

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Status: offline 		I've built enough cardens to know that if bob's 260 balanced at 2.5" behind F-2 that he had a problem and this is why I asked him if that was with the wings and stabs on. He answered my question so what's the problem ? Hey at least I've used my real name on all my post !

Albert
quote:

ORIGINAL: Kaos1964

An otherwise really interesting thread has moved towards the ridiculous.

Albert, there's no doubt you do great work and have built many Cardens - thus your selection by Dennis to build one of the 300 prototypes - I have nothing but respect for your capabilities.

Does this have to be a pis$ing contest? This is pushing the envelope, could work, could fail - I'm keenly interested in the outcome and would love to see the pointless debate removed from the discussion and just sit back and watch the facts unfold.

Ok, I'm done.

Respectfully,

Bob





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RE: 40% 260 on a Diet - 1/19/2007 1:03 AM   
T28pilot



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Status: offline 		I thought the reference to the CG without stabs and wings was quite brilliant so I thought I'd apply this to my project. I checked the CG balance on some boxes of a kit for my 32% Yak and found they all were 1/2 inch left of center. This mind you was with the packing tape removed and the peanuts still in the box. The cowl box was smack dab in the middle which worked out correctly with a 1/4-20 nut on the opposite side. Had me worried for a bit but I think I'm in the reccomended range. I like this looking down the road approach. Thanks for the tip..T28

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RE: 40% 260 on a Diet - 1/19/2007 1:09 AM   
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Status: offline 		"... I thought the reference to the CG without stabs and wings was quite brilliant so I thought I'd apply this to my project...."




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RE: 40% 260 on a Diet - 1/19/2007 10:01 PM   
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RE: 40% 260 on a Diet - 1/21/2007 10:27 AM   
260 Man


 

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Status: offline 		Today Bob was able to accomplish a lot on the tail section. After hacking at the elevators half’s and getting the end caps on the horizontal stabs, here are the results.

Each elevator came in at 3.2 oz
Total weight of both elevators and both stabs 15.0 oz




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RE: 40% 260 on a Diet - 1/21/2007 10:30 AM   
260 Man


 

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Status: offline 		Rather than use, the supplied L bracket Bob decide to make an end cap that replaced the L bracket.




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RE: 40% 260 on a Diet - 1/21/2007 10:32 AM   
260 Man


 

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Status: offline 		After installing the tail feathers the total weight as it sit is 17 lbs 5.6 oz………..
The CG is currently at 8" aft of F2.




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RE: 40% 260 on a Diet - 1/21/2007 10:41 AM   
260 Man


 

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Status: offline 		We also had gussets made tonight, 1/32 ply cut to 1.5” diameter with 3/8 x 3/4 cut outs on center.



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RE: 40% 260 on a Diet - 1/21/2007 4:22 PM   
RobT



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Status: offline 		What is the step by step procedure to join the cowl to make it into a one piece?

Thanks

Rob

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RE: 40% 260 on a Diet - 1/22/2007 3:17 AM   
sensei



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Status: offline 		1. Trim the lower cowling ship lap to .375"
2. Abrade lower cowling ship lap area with 180 grit abrasive
3. Abrade upper cowling inside interface area
4. Fit cowling together nesting the top cowl to the bottom cowl
5. Use masking tape on outside of cowling as a holding fixture
6. Place side of cowling down on flat surface and run thin C/A into bond line area while applying pressure downwards to the flat surface
NOTE: Only bond 2" at a time, while applying pressure spray kicker, repeat until all areas are bonded.
7. Peel tape from the outside of cowling and fill seem with C/A and kicker per the note listed above.
8. Prep for prime fill and topcoat.

I hope this helps you.

Bob

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RE: 40% 260 on a Diet - 1/24/2007 7:14 AM   
T28pilot



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Status: offline 		I slid both my 32% yak wings unsheeted on the wing tube and lifted the tube in the center. Both wings dropped towards the trailing edge. I'm thinking I'll end up tail heavy. Did you notice this with yours??? Thanks for the great build thread, T28

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RE: 40% 260 on a Diet - 1/24/2007 9:52 PM   
sensei



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< Message edited by sensei -- 1/28/2007 6:34 AM >

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RE: 40% 260 on a Diet - 1/30/2007 12:22 AM   
k5mog



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Status: offline 		Kudos to you and your friend 260 man. This a really intersting build after the nansayers are edited out. I've built several Cardens and they all turned out heavier than I had hoped. My first was a 35% edge, which finished at 30#, however it was glassed and painted. I hope this 260 build is sucessful for your friend so I can follow his lead. Please don't leave anything out.

Ralph

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RE: 40% 260 on a Diet - 1/30/2007 3:03 AM   
260 Man


 

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quote:

ORIGINAL: k5mog

Kudos to you and your friend 260 man. This a really intersting build after the nansayers are edited out. I've built several Cardens and they all turned out heavier than I had hoped. My first was a 35% edge, which finished at 30#, however it was glassed and painted. I hope this 260 build is sucessful for your friend so I can follow his lead. Please don't leave anything out.

Ralph


Ralph,

Thanks and I will keep all the information flowing as he accomplishes each task. There will be a first flight video to follow also.

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RE: 40% 260 on a Diet - 1/31/2007 7:24 AM   
260 Man


 

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Status: offline 		Here are some photos of Bob's work.......

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RE: 40% 260 on a Diet - 1/31/2007 7:30 AM   
260 Man


 

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Status: offline 		wing work

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RE: 40% 260 on a Diet - 2/5/2007 5:11 AM   
sensei



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Status: offline 		Here are a couple more pictures, The weight is at 22 lbs 3 ozs. as it sits.

Bob

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