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Taco .25 plans

Old 02-25-2008, 11:37 PM
  #476  
PaulSwany
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Default RE: Taco .25 plans

I've had problems with warpage with the 1/4 sheeted structure... Sometimes it's nice and flat... sometimes it's a banana.... Try soaking it and weighting it to over compensate for your warp... Hopefully it'll come out. I've found that CA works better than wood glue for this as the wood glue seems to promote warpage...

That's why I went with an open structure on the Fat Free Taco...
Old 02-26-2008, 10:47 AM
  #477  
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Default RE: Taco .25 plans

I soaked both sides with Windex w/ ammonia... few applications to make sure the sheeting is dampened with it... weighed it flat with 155# of dumbbells on top of a smooth board on my kitchen counter to dry overnight.. Do I need to bend this fuselage past the flat point to get the warp out or will my current method work? There is a bit of a twist to the warp so I don't know if dampening it and bending it with dowels would get it flat.

Appreciate any input!

somegeek

I realize you have a twist.

Dampen the wood again.... You find the centerline of the twist....it probably runs at a 30 degree angle acraos the fuse...right? You need to lay the the fuselage with the warped edges up on to a strip of wood or a large half dowel and then with some light weights on both of the warped up edges. You may not get it the first time. You have to repeate the process a couple times.....just a little at a time.

That is the way I and many other do it and have done it for years. Wetting the wood and laying it flat with weight on top will not take the warp out...sorry........
Old 02-26-2008, 10:51 AM
  #478  
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Default RE: Taco .25 plans

After looking at this again last night, I shimmed up the tail with 1/16" of material. Sounds like I need to do more then to bend this back.

Thanks, imsofaman.
Old 02-26-2008, 10:53 AM
  #479  
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Default RE: Taco .25 plans

Slow and steady wins the race.....be patient and you will achieve the desired results.

Dave
Old 02-26-2008, 08:23 PM
  #480  
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Default RE: Taco .25 plans

Good deal - little by little then...

Got it mostly flat overnight. Still partially damp in the middle. Shimmed the tail to tweak it about 1/8" the opposite way, hit the side that needs to expand a little with windex and braced in place to dry overnight again. Thinking I can add some tuffline flight wires on the back end if all else fails to keep the tail feathers square. All else fails I need to order more balsa!

If I go the new fuse route, I am wondering if I could just do a 1" strip of 1/32 ply down the middle balsa member on each side instead of balsa sheeting the whole enchilada... er Taco side to help reinforce the tail?

somegeek
Old 02-27-2008, 08:20 PM
  #481  
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Default RE: Taco .25 plans

Fuse is mostly dry and it's flat! There is about a 1/8" bend to the fin which will be remedied with some flight lines on the tail feathers but the rest of the fuselage is flat. Gonna let it sit bent with weight for a few more days to totally dry. Some of the 1/16" sheeting is warped but I will sand what I can and cover and you won't see once the covering is taught.

Thanks for the advice guys.

Edit... after fully drying another day - this thing is still tweaked.

Took the advice of others and built up a new fuse tonight and placed the old one in the trash. No sheeting on this one so I added some more structure to it.

somegeek
Old 03-01-2008, 07:06 AM
  #482  
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Default RE: Taco .25 plans

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Old 03-01-2008, 12:01 PM
  #483  
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Default RE: Taco .25 plans

Built up a new fuselage the last few nights... and no warpage!



Weighs in a 4 3/8 oz... over an ounce lighter than my last fuselage and I expect to see at least 1/4oz less after carving out the wing and engine mounting areas. Also built in the servo mounting areas for the pull-pull controls. Also added 1/4" of carbon fiber ribbon w/ epoxy to each side of a 1/4" bass wood member down the middle. That ribbon is kinda tricky to work with. Pressed in place with saran wrap(releases easily from epoxy) to set it in place.

somegeek
Old 03-02-2008, 12:21 AM
  #484  
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Default RE: Taco .25 plans

Weighs in at 3 3/4 oz. after final cut-outs and sanding. Dremel made quick work of the cut-outs.



Do you guys cover the fuselage, wing and horizontal stab first and then remove covering to glue things up or glue things up first and then cover later?

somgeek
Old 03-02-2008, 04:43 PM
  #485  
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Default RE: Taco .25 plans

well I switched out the .25FP for the .25FX and spent half the day getting the servos in, just have to put the rest of the radio in and control rods/horns...had this brilliant idea to make my own servo rails.glued em all in and then went to mount a servo only to find that the arms were flush with the covering,,not enough room for control rods then had to go in and cut all of them back down ...its really tight in there for this work..thats what took so long.......Rog
Old 03-03-2008, 05:22 PM
  #486  
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Default RE: Taco .25 plans

Hey one more thing...how is the glide on this thing...I generally deadstick in with my other planes, mostly 1/2A stuff, is it gonna just stop in the air like my uproar does...only flown it a couple of times....Rog
Old 03-04-2008, 03:09 AM
  #487  
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Default RE: Taco .25 plans

Getting there...



Doculam is pretty nice stuff to work with.

somegeek
Old 03-04-2008, 08:22 AM
  #488  
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Default RE: Taco .25 plans

That looks awesome somegeek!

Liking the colour sceme so far.

I can't wait to roll a Taco out myself but chores get in the way at the moment.

What engine are you thinking of putting in? Im going for a J'en .37. Its a .37 in a .25 case.
Old 03-04-2008, 08:28 AM
  #489  
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Default RE: Taco .25 plans

Somegeek....wow....you do good work. It looks a real winner!

Guy P.....please give some details on thamotr you have?
Old 03-04-2008, 10:56 AM
  #490  
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Default RE: Taco .25 plans

Thanks for the kind words guys!

Gonna put a GMS .32 on here with a 10x3 APC prop. Should pull it around nicely.

somegeek
Old 03-05-2008, 10:12 AM
  #491  
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Default RE: Taco .25 plans

imsofaman

The J'en engines are manufactured by Just Engines here in the UK.

All the juicy info here:-

[link=http://www.justengines.unseen.org/acatalog/Jen.html]http://www.justengines.unseen.org/acatalog/Jen.html[/link]

I dont have the engine yet but I want one! A good friend of mine swears by them. Good reliable engines and suberb performance for the size.
Old 03-14-2008, 07:13 PM
  #492  
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Default RE: Taco .25 plans

Got my covering done... all monokote except the somgeek air logo which is black sticker vinyl. Cut using a Graphtec CraftROBO 200 cutter.





Just need to add my radio gear now.

My wife graduated from WSU last year so this is a bit of a tribute.

And gotta give props to Paul for posting these plans for free. Thanks again man.

somegeek
Old 03-14-2008, 10:29 PM
  #493  
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Default RE: Taco .25 plans

Looks great!! Hope you have lots of fun with it!
Old 03-14-2008, 11:33 PM
  #494  
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Default RE: Taco .25 plans

Killer Taco!!!! Looks awesome!!!!!

Dave
Old 03-20-2008, 12:48 AM
  #495  
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Default RE: Taco .25 plans

Thanks for the kind words guys!

Just have a few things to wrap up with this.

Got the engine mounted tonight and with the Rx and Rx pack pushed up to the front of the open area in the wing, I have the CG at 1.25" behind the spar.

I still need to mount the tank and Rx switch, but this is going to be centered just in front of the CG so it won't alter it much.

Question is, what is the safe manageable CG range for this plane? I know Paul suggests to start at .5" behind the CG and some folks stated the fly at 1.5" behind the spar.

I fly my Sig Somethin' Extra at about 1.25" behind the suggested CG(wing spar) and folks fly this up to 2" behind the stock CG but anything past that is said to be unmanageable. Looking for this sort of range for the Taco.

Thanks,
somegeek
Old 03-20-2008, 10:00 AM
  #496  
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Default RE: Taco .25 plans

A good rule of thumb on quad tapered wing profiles is to take the full wing cord including ailerons, and multiply by .3. The wing cord on a taco is 15". So 4.5" from the leading edge would be a good place to start. Once you get it in the air and trimed for level flight, roll inverted and if she dives, she's nose heavy, climbs she tail heavy... Adjust to suit your taste.
Old 03-20-2008, 11:12 AM
  #497  
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Default RE: Taco .25 plans

Great - will do. Thanks, Paul.

somegeek
Old 03-25-2008, 12:44 PM
  #498  
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Default RE: Taco .25 plans

Ok, I've asked 3 or 4 questions in the last 2 pages that have gone unanswered,,,well today I started the .25FX for the first time on my sidewalk at home....what a powerhouse, dont think the 2 oz tank is gonna be much fun considering it only ran for a minute or so..I know it was runnning rich, but geeez!..hope to get this thing in the air in the next week or 2...Rog
Old 03-25-2008, 12:49 PM
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Default RE: Taco .25 plans

Nice - got any pics of your build?

somegeek
Old 03-25-2008, 01:48 PM
  #500  
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Default RE: Taco .25 plans

ORIGINAL: flyinrog

Hey one more thing...how is the glide on this thing...I generally deadstick in with my other planes, mostly 1/2A stuff, is it gonna just stop in the air like my uproar does...only flown it a couple of times....Rog
It glides okay... But like any 25 size plane, the glide is not as good as a larger plane...

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