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Very Hot Topic (More than 25 Replies) Fisher P-75 Eagle (Read 5031 times)
MKelly
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Re: Fisher P-75 Eagle
Reply #64 - Oct 7th, 2019 at 1:47pm
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That's fantastic AK!  I'm a sucker for a colorful natural metal scheme - you nailed it, and the unusual subject makes it even better.  You should really think about bringing some of your models to a FAC meet.

Mike
  
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neoflight
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...now how am I gonna
get that down!

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Re: Fisher P-75 Eagle
Reply #63 - Oct 7th, 2019 at 12:57pm
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Spectacular model Smiley  Certainly looks like a stable flyer.
Neoflight
  
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Sky9pilot
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Stick & Tissue

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Re: Fisher P-75 Eagle
Reply #62 - Oct 7th, 2019 at 12:33pm
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WoW....I'm blown away!!! Smiley Smiley
  

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Kerak
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Re: Fisher P-75 Eagle
Reply #61 - Oct 7th, 2019 at 10:59am
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Beautiful, Alf...doesn't get any better than that!  Love the spinner...even got the stars et. al...just beautiful. Smiley

Neal
  
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alfakilo
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Re: Fisher P-75 Eagle
Reply #60 - Oct 7th, 2019 at 10:41am
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Aside from balancing, this one is complete. Came in at 30gms. I included the real world inspiration for the color scheme, a P-47 from the 358 Fighter Group, Germany, 1945.
  

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Dan
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Re: Fisher P-75 Eagle
Reply #59 - Oct 6th, 2019 at 9:06am
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Both soup cans and cottage cheese containers are readily available to me, so maybe I'll practice with the sheet of 1/20" I bought. If I follow through with my somewhat outlandish idea to build a fleet of PC-6s, most will have scale props.
  

Building stick-and-tissue models is a hobby, not work.
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alfakilo
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Re: Fisher P-75 Eagle
Reply #58 - Oct 6th, 2019 at 8:48am
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Dan wrote on Oct 6th, 2019 at 8:24am:
What is this "forming can" you speak of?


A technique for home-made props is to shape them over a form that will make an airfoil curved blade. Some use 'cylindrical tin cans' (regular soup can!), some use a tapered cylinder (often referred to as a cottage cheese or yogurt container). Some call this a 'bucket prop'.

See the prop section in this forum for articles on how to do this.

Not hard to do and combined with the Comet hub/spinner idea makes a fun and interesting project. Commercial props are probably more effective and much easier to use but making your own semi-scale prop can add much enjoyment to a build!
  
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Dan
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Re: Fisher P-75 Eagle
Reply #57 - Oct 6th, 2019 at 8:24am
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alfakilo wrote on Oct 6th, 2019 at 7:38am:
After I glued the tissue on, I strapped the blade back on the forming can to keep the shape.

What is this "forming can" you speak of?
  

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alfakilo
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Re: Fisher P-75 Eagle
Reply #56 - Oct 6th, 2019 at 7:38am
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Regarding the question of reinforcing prop blades, I've tried the idea of gluing tissue to the backside of the blade. Seems to work OK but may also tend to flatten the blade out a little. After I glued the tissue on, I strapped the blade back on the forming can to keep the shape. Worked pretty well.
  
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alfakilo
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Re: Fisher P-75 Eagle
Reply #55 - Oct 5th, 2019 at 3:06pm
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I've watched those videos several times. Good stuff.

But I've had a problem with this method when covering fuselages that have considerable curvature both around and along the fuselage. The X-1 and P-75 both have this issue.
  
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Re: Fisher P-75 Eagle
Reply #54 - Oct 5th, 2019 at 2:21pm
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Alf - Thanks for the link and this might be a good solution for my Interstate Cadet waiting for a propeller. Thanks again.
Mike
  

"Skill comes by the constant repetition of familiar feats rather than by a few overbold attempts for which the performer is yet poorly prepared." Wilbur Wright
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Sky9pilot
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Re: Fisher P-75 Eagle
Reply #53 - Oct 5th, 2019 at 9:58am
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Outstanding!!!  Some of the fellas will EDIT: glue/not blue tissue to the backs of the prop blades to add some strength without too much weight. 

As for the fuselage covering, I've had pretty good luck using the tissue wet and making relief cuts around the wing saddle and cockpit as I covered to get the contour.  Following Bern's wet covering technique, here's a link to the videos: Click Here
Tom
« Last Edit: Oct 5th, 2019 at 6:32pm by Sky9pilot »  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Kerak
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Re: Fisher P-75 Eagle
Reply #52 - Oct 5th, 2019 at 9:05am
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I do think  you've got a lock on it, Alf!  Smiley  That prop is a creation of beauty all by itself.  Don't really know why...but every time I witness a Comet-style prop going together...I just get a big smile.  Grin  Maybe it's because I tried to build one as a kid...a big no-go...and to realize those guys really did know what they were doing.  Hey, and you've taken it even further!  Broadened its application!  Very nice work! Smiley

As for being able to fly your model...no doubt in my mind it will work.  It's all a matter of balance and rpm's to match the pitch.

Survivability...that's another matter, as it is for any wooden propeller, large or small.  NO PROP is intended to impact the earth.  How to toughen up those blades?

Great stuff, Alf...model is an eye-popper.  Shocked

Neal
  
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alfakilo
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Re: Fisher P-75 Eagle
Reply #51 - Oct 5th, 2019 at 7:39am
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Sure, look here! Go to page 5 of the thread.

https://www.stickandtissue.com/cgi-bin/yabb2/YaBB.pl?num=1557079827

I use this program to make the spinner/prop hub. I set the blades at a 62 degree angle (I measured the Comet angle for this, no idea if it is correct!!).

https://www.blocklayer.com/cone-patterns.aspx

Here is the pattern for the P-75. Using the blocklayer program, select 'lines' in the Draw box to present the lines in the picture that separate the 3 sections. Extend these lines to find the center point where they cross. Then draw a line from this center to the prop slot circle. Use this to measure the 62 degree angle.
« Last Edit: Oct 5th, 2019 at 3:02pm by alfakilo »  

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Re: Fisher P-75 Eagle
Reply #50 - Oct 5th, 2019 at 6:48am
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Prop is another Comet type. 1/32" blades, card stock spinner with a balsa nose tip. Can't thank Neal enough for alerting us to this prop method, neat way of getting a semi-scale looking thing that might actually work!!

Went to my bookmarks for this thread but cannot locate it. Possible to link me back to the post?
Mike
  

"Skill comes by the constant repetition of familiar feats rather than by a few overbold attempts for which the performer is yet poorly prepared." Wilbur Wright
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