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thjakits

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Joined
Jul 3, 2014
Messages
134
Location
Panama, Rep. of Panama
How about Polen Special ?

I think that is truly a hot ride.

Affordable too.

View attachment 125293
One of my dream airplanes! (likely will stay a dream only...)

Usually I get "idea-drift" - let's do the quick hop single! ....maybe do a 2-seater, just to bring along someone.
Now if we expand a little more we could..... and there we are with the flying family van!

BUT, I do wonder sometimes what it would take to get a tight, but comfortable single with a modern(ized) engine and a alu-skin around it....
The original Polen was quite heave on nav-gear and the all mechanically controlled certified turbo installation wasn't exactly light either. I don't know how much the current owner worked on these items...
But imagine a proper LS derived power plant (I would dig in a find out which is lighter the V8 or a V6) twin-turbo, EEC, etc... - or a proper Subaru-6.....
What I wonder is, if a different airfoil would be of advantage or if the good old NACA 65-212 is the still the best for the machine...
 
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J.L. Frusha

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Joined
Feb 17, 2006
Messages
1,043
Location
Luling, Texas
RV-4 with Rocket mods and a LS V8. Move the pilot to the rear seat and slide the firewall back a few inches for CG... Mini Warbird replica with actual performace to back up the looks. Done

Might as well go for the whole shebang and get the Julie Andrews/Mary Poppins Special... (Notice the parasol wing and the unique landing gear)

1652007852295.png
 

EzyBuildWing

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Joined
Sep 23, 2009
Messages
635
Location
Sydney NSW Australia
Some super neat-looking flying machines here.....
 

Sraight'nlevel

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Joined
Nov 4, 2021
Messages
387
One of my dream airplanes! (likely will stay a dream only...)

Usually I get "idea-drift" - let's do the quick hop single! ....maybe do a 2-seater, just to bring along someone.
Now if we expand a little more we could..... and there we are with the flying family van!

BUT, I do wonder sometimes what it would take to get a tight, but comfortable single with a modern(ized) engine and a alu-skin around it....
The original Polen was quite heave on nav-gear and the all mechanically controlled certified turbo installation wasn't exactly light either. I don't know how much the current owner worked on these items...
But imagine a proper LS derived power plant (I would dig in a find out which is lighter the V8 or a V6) twin-turbo, EEC, etc... - or a proper Subaru-6.....
What I wonder is, if a different airfoil would be of advantage or if the good old NACA 65-212 is the still the best for the machine...


I think mr. McRae here was into it...making a souped up version of it.

I wonder how he is advancing.
 

Sraight'nlevel

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Joined
Nov 4, 2021
Messages
387
I see beauty in many of the old designs (vintage and early years of flight), but to throw a few at you that are more akin to the examples you have given so far...


Lockheed Constellation (Connie)
View attachment 17796 View attachment 17791


Lancair
View attachment 17795 View attachment 17793 View attachment 17792


Mustang (one of these photos is the one I maintained and flew)
View attachment 17797 View attachment 17798 View attachment 17790


Denny Polen's Special
View attachment 17799


Republic XF-12 Rainbow
View attachment 17800 View attachment 17801


Beech Staggerwing


Lockheed SR-71
What was XF-12 all about ?
 

Tiger Tim

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Joined
Apr 26, 2013
Messages
4,849
Location
Thunder Bay
What was XF-12 all about ?
Photo reconnaissance. The F in those days stood for Fotography*. The F-5 was a recon Mustang and F-6 a recon Lightning, for example. The Republic Rainbow competed with the Hughes XF-11 twin engine, twin boom recon plane, I guess for a contract for purpose-built machines instead of modified fighters for the job. The Northrop (not McDonnell) F-15 Reporter, based on the P-61 Black Widow did see some mass production and service in this role.


*Just a couple years later the US Air Force would change their designation system so the P- for Pursuit planes became F-for Fighters.
 

Sraight'nlevel

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Joined
Nov 4, 2021
Messages
387
Photo reconnaissance. The F in those days stood for Fotography*. The F-5 was a recon Mustang and F-6 a recon Lightning, for example. The Republic Rainbow competed with the Hughes XF-11 twin engine, twin boom recon plane, I guess for a contract for purpose-built machines instead of modified fighters for the job. The Northrop (not McDonnell) F-15 Reporter, based on the P-61 Black Widow did see some mass production and service in this role.


*Just a couple years later the US Air Force would change their designation system so the P- for Pursuit planes became F-for Fighters.


That is very impressive.


Aerodynamics matter !
 

Aesquire

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Joined
Jul 28, 2014
Messages
3,298
Location
Rochester, NY, USA

Probably the most unique/unusual aspect of the Republic Rainbow was the engine cooling system that didn't use drag producing flaps.

I point at the B-29 which had a catch-22 of engine cooling/overheating issues, a lot caused by the Wright engine itself, which is worthy of a scathing rant alone, but the drag issues with the Boeing nacelle design caused a horrible positive feedback issue. Engine get hot, open flaps, drag goes way up, so more power needed to maintain formation, make engine hotter, so open flaps more, more drag, more throttle, more heat, more.......

There is no free lunch, but the Rainbow nacelle didn't have nearly as much drag increase with more cooling. It's not the first with that design, ( coffee brewing & I forget who invented it! ) but it's probably the prettiest.

The Northrop Reporter is IMHO a much better looking plane than it's original Night Fighter P-61 version. ( an under appreciated design ) An Escort Fighter version was proposed, but not ordered.


The F-15 Reporter did mapping missions right after the war of a huge area of the Asian Pacific coast and islands. Wouldn't surprise me if those maps are still in use. Other than the expenses of keeping 2 R-2800s running & fed, it'd be a great warbird/recreational plane. When your weekend hamburger run is to Hawaii & you want a few pounds of great coffee for tomorrow.
 

MaxLA

Member
Joined
May 6, 2022
Messages
23
Some might say "most nostalgic" rather then "most beautiful," to me that is the same thing. The location is South Bass Island Ohio. The 352 foot Doric column just east of Put-In-Bay harbor was built in 1912 to commemorate the 100th anniversary of Oliver Hazard Perry's defeat of the Royal Navy at the Battle of Lake Erie.
tri-motor-event.jpg
As a teenager and young adult I made several short trips between the Marblehead Peninsula and the islands on tri-motors. From 1946 to 1985 Island Airlines flew both 12 seat AT-4s and 17 seat AT-5s, including 5-AT-B #8 N9645-- now owned and operated by the Liberty Aviation Museum at Port Clinton-- pictured above. One flight per day in winter, more in spring, summer, and fall. Providing common carriage, passengers, freight, parcels, and US Mail, from Port Clinton Municipal Airport to South Bass, Kelleys, Middle Bass, Rattlesnake, and North Bass Islands.
 

Aesquire

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Joined
Jul 28, 2014
Messages
3,298
Location
Rochester, NY, USA
The externally Obvious looks of the Rainbow is from using rotations of a low drag symmetrical airfoil. This was a big feature of the Martin B-26, which used the same airfoil as the wing for the fuselage.

Another good looking plane.

And a great example of one of my pet peeves. ;)

RANT ON! ( feel free to ignore )
When an airplane gets the nickname Widowmaker, it's not usually high praise. Speed in the Marauder's case came from high power, low drag, and high wing loading.

Like many designs from before The Battle of Britain, lessons learned caused a big increase in weight after the addition of more armor, and self sealing fuel tanks. Turning an already Hot plane into a very demanding one. Even after increasing wing area, the added weight left it with a high wing loading and stall/landing/takeoff speed.

RANT... projects gain weight!

IMHO it's better to have too much wing and have the option of a "clipped wing" speed version, than too little wing, resulting in a choice between big redesign work or compromised capability.

END RANT. :)
 

Hawk81A

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Joined
Sep 3, 2021
Messages
319
RANT ON!
When an airplane gets the nickname Widowmaker, it's not usually high praise. END RANT. :)
Another defender of "The Marauder". The poor bird had so many negative nick names. To this day, the inaccurate myths follow it ("One a day in Tampa Bay") When compared to all other WWII aircraft types, the training loss ratio actually wasn't that bad. I have been to 3 different WWII Marauder crash sites (others still waiting). And I have seen 3 of the less than 10 survivors - including seeing one FLY. The plane suffered from inexperienced pilots getting into an unforgiving airplane. In researching them, we also found there were a number of accidents where failure of the left engine caused the aircraft to flip over on it's back - often with fatal results. Once the bugs were worked out, they went on to have the lowest combat loss rate. My preference is for the earlier models. Dennis
 

Aesquire

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Jul 28, 2014
Messages
3,298
Location
Rochester, NY, USA
Once the bugs were worked out, they went on to have the lowest combat loss rate.

Yep! Fast, tough, and used in the very dangerous medium altitudes where flak guns of smaller size ( & much more numerous ) Could reach. But the best choice bomber for getting home.

The Martin planes were mostly ignored by American press & historians. The Baltimore and Maryland had a disproportionate effect in the African & Mediterranean theaters, where, like the P-40, they were the most advanced performers for the Allies ( notably the British ) Available at the time. & the Martin Mariner in the Pacific was a major asset.

Like the Marauder, overshadowed by planes that got the press and movie rolls.
 
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