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Phoenix 8 trim problem

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Old 11-22-2004 | 01:54 PM
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From: Rosamond, CA
Default RE: Phoenix 8 trim problem

What you have is a Hobby Barn Magic, also a Prettner design. I had one back in the late 70's, early 80's. It was alright, but it had a horrible pitch to the belly in knife edge flight. I never thought Prettner gave Hobby barn the right drawings!
Old 11-22-2004 | 02:00 PM
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From: EbeltoftEbeltoft, DENMARK
Default RE: Phoenix 8 trim problem

Hi
Yes it's a Magic be sure on that, i have one of the kind, but build from an MK plan, never flown with it yet.

Regards
Kjeld Pedersen
Denmark
Old 11-22-2004 | 06:15 PM
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Default RE: Phoenix 8 trim problem

Tommy,

Tony and Kjeld are certainly right.. it's a Magic... matter of fact, I bought a hatori header for a YS 60 for one and never got the kit !!! Still have that puppy. It takes the R/E and puts it to the top of the fuse tunnel. At any rate, I'd certainly finish it...

Dan


aka deadstik....[8D]
Old 11-22-2004 | 06:19 PM
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Default RE: Phoenix 8 trim problem

Tommy,

Here is a pic of a completed one. I don't know who to give credit for the build to as it's just from my archieves. Pretty plane !!!

Dan
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Old 11-22-2004 | 08:11 PM
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Default RE: Phoenix 8 trim problem

Thanks guys for all this information and confirmation as to what the plane is. For the life of me the name rings no bells at all. I wonder if I bought it as something else. Anyway, I plan on completing it this winter.

Dan, please point me to where I can get the information to correctly add photos to these post. I have seen lots of them side by side and where the actual thumbnail becomes the link to the larger image. Help on that.

Tommy
Old 11-22-2004 | 09:17 PM
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Default RE: Phoenix 8 trim problem

Tommy,

The key to adding photos to any post is that you cannot add photos to the "quick" response box at the bottom of the forum. To add a picture to your reply, you must first click on the "Reply" button on the post you wish to reply to. After you add whatever message you wish to send you will see a link at the bottom left of the response you are writing which says "Upload documents" When you click on that, another box will open up on your screen and you can select I believe up to 4 photos to add to that post. The pictures will not appear in your draft, only after they have been uploaded and the page refreshed. You do have to wait till the box says, "Upload Complete" Hope this helps.... good luck with the plane,


Dan.......[8D]
Old 11-22-2004 | 09:29 PM
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From: Valdosta, GA
Default RE: Phoenix 8 trim problem

Dan,

Thanks for that information. I am trying to check that out here and will post an image with this reply.

Dan, think I've got it now. This is a picture of my Shoestring 1/4 scale and yours truly at the field for the second time in 22 years.

Thanks, Tommy
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Old 05-04-2005 | 03:24 AM
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Default RE: Phoenix 8 trim problem

Hi everyone, I searched for phoenix 8 and the search led me to this forum. I have just completed the longest project that I started 30 yrs ago, this was my second airplane I started to build was the Phoenix 8. Well after 30 years it is just about ready to fly, finally, equipped with O.S. 61 FX and Kraft electric tri-gear retracts. My only concern is the balancing, it seems to be tail heavy, but I lost he plans long ago and don't know where the balance point is. Can someone help? How far back from the leading edge of the wing at the side of the fuselage? I also was wondering about the overall weight and if someone could offer their opinion on how it would fly, with this bird weighing in at 8 1/2 lbs. I am new at this but will try and post a picture.
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Old 05-04-2005 | 07:21 AM
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From: Fort Mitchell, AL
Default RE: Phoenix 8 trim problem

Nice bird, Rule of thumb is 1/3 back from the leading edge of the wing at the root.
Old 05-04-2005 | 10:04 AM
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From: Glen Robertson, ON, CANADA
Default RE: Phoenix 8 trim problem


ORIGINAL: Paternguy

Nice bird, Rule of thumb is 1/3 back from the leading edge of the wing at the root.

not in a swepback wing, be carefull
Roger
Old 05-04-2005 | 11:01 AM
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From: glasgow, UNITED KINGDOM
Default RE: Phoenix 8 trim problem

[img][/img]

A good place to start is to balance at 25% of the wing mean aerodynamic chord. Here is how to calculate that position graphically.

Draw the wing planform full size. Draw a line from one end of the tip chord to the opposite end of the root chord. Now measure the root chord and add it to the tip chord as per the sketch. Do the same with tip chord and add it to the root chord. Draw a line connecting the ends of these new lines as per the sketch. Where these lines cross is the Mean Aerodynamic Chord for the wing. Draw a line chordwise at this point. Measure back 25% along the M.A.C. Project this line onto the fuselage and this is where to balance the model.

This is a safe starting point which you can work back from.

Hope this helps

Malcolm
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Old 05-04-2005 | 01:07 PM
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Default RE: Phoenix 8 trim problem

Dawg Pilot - I called a friend of mine who still has the plans for a Phoenix 8. The plans show a CG location of 6 3/4" back from the leading adge of the wing at the center of the wing.

Hope this helps,

Jon Carter
Old 05-04-2005 | 01:51 PM
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From: escondido, CA
Default RE: Phoenix 8 trim problem

Alright you guys are outstanding. Thanks for the help it was just what i needed.
thanks!!
Old 05-04-2005 | 02:33 PM
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Default RE: Phoenix 8 trim problem

I am balancing right at 7" at the center of the wing, in my experience this would not normally be a problem, just want to be sure after all would hate to snap it in at landing with a plane that took 30 yrs to build. Any opinions?
Old 05-04-2005 | 02:34 PM
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From: Hutto, TX
Default RE: Phoenix 8 trim problem

I FINALLY got my Atlanta 60 up last week...old pattern ships rule! Bet ya my Atlanta with Rossi r/e on pipe kicks your 8's ass...lol....Super Fast...Rossi claimes 2.35 h.p...@17,000rpm...OMG!...Big_G
Old 05-04-2005 | 02:42 PM
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From: Hutto, TX
Default RE: Phoenix 8 trim problem

Trike gear retracts?...wow...my Atlanta sat unfinished for 19 years...all the pneumatic lines were rotten...had to cut open the lower wing to replace them....gggrrrrr!. 30 years? you are more patient than I...lol big_G
Old 05-04-2005 | 04:03 PM
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Default RE: Phoenix 8 trim problem

LOL!! I bet your right! But ya gotta love the Phoenix 8, still one of the best lookin pattern ships around IMHO. Lets see some pics of that Atlanta.
Old 05-05-2005 | 11:12 AM
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From: Glen Robertson, ON, CANADA
Default RE: Phoenix 8 trim problem


ORIGINAL: dawg pilot

LOL!! I bet your right! But ya gotta love the Phoenix 8, still one of the best lookin pattern ships around IMHO. Lets see some pics of that Atlanta.

I have a Phoenixs 8 that I would be willing to sell since I don't use it . Its a tail dragger with carbon landing gear. danged the nose a bit but aside from that in very good shape.

Off line please [email protected]

Roger
Old 05-06-2005 | 11:08 PM
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From: Hutto, TX
Default RE: Phoenix 8 trim problem

Here are the Atlanta pics...
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Old 05-07-2005 | 01:32 AM
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Default RE: Phoenix 8 trim problem

Wow I love those colors, hehehe Love that anhedral stab, makes me want to get my curare finished.
Old 05-07-2005 | 02:36 PM
  #46  
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Default RE: Phoenix 8 trim problem


ORIGINAL: big_G

Here are the Atlanta pics...

Big G,

Your Atlanta is so highly modified that it looks just like a Curare. How did you do that?
Old 05-07-2005 | 07:14 PM
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Default RE: Phoenix 8 trim problem

Not modified at all, build exactly as designed...although many pattern planes of that era looked similar....big_G
Old 05-07-2005 | 07:33 PM
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From: Atlanta, GA
Default RE: Phoenix 8 trim problem


ORIGINAL: big_G

Not modified at all, build exactly as designed...although many pattern planes of that era looked similar....big_G
Sorry, there must be some distortion in the camera, it looks exactly like a Curare in your photos. The tuned pipe even looks like it is on the side of the fuselage!
Old 05-07-2005 | 07:40 PM
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From: Arizona
Default RE: Phoenix 8 trim problem

Looks like a Curare to me too!
Old 05-07-2005 | 08:02 PM
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Default RE: Phoenix 8 trim problem


ORIGINAL: roncoleman

Looks like a Curare to me too!
I’m thinking that the camera distortion makes it look like a Curare. It makes the pipe look like it isn’t enclosed in the lower part of the fuselage, makes the wing position look lower and makes the stab look like it has anhedral. Just a camera thing.


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