# Making an "obsolete" fighter into an unlimited racer !

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#### Speedboat100

##### Well-Known Member

Do you see there is any sense in this ?

Having new wing and fuselage retought etc ?

Tripling the horsepower....and other refinements.

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#### TerryM76

##### Well-Known Member
HBA Supporter
A Brewester Buffalo!!!??????

#### Speedboat100

##### Well-Known Member
A Brewester Buffalo!!!??????

Yes we finns even made a copy of it called HUMU ( hype )...after we started run out of originals.

I'm trying to make a R-2800 version of it.

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#### Kyle Boatright

##### Well-Known Member
The R-2800 version is called a Bearcat. ;-)

#### Speedboat100

##### Well-Known Member
The R-2800 version is called a Bearcat. ;-)

You could say that.

I try to make the wing into F8F direction....perhaps with slightly thinner foil.

I may end up having just R/C model of it.

#### Speedboat100

##### Well-Known Member
I find Brewster F2A sorta complicated.

But I think it has potential.

#### lr27

##### Well-Known Member
Later versions of the Buffalo were heavier too.

#### Victor Bravo

##### Well-Known Member
The days of upgrading and hot-rodding old warbirds are dead and gone. To have a competitive racer today requires a clean sheeet.

#### Voidhawk9

##### Well-Known Member
HBA Supporter
Forget Unlimited. Too limited, ironically.
Sport class hasn't even come close to exploiting the full potential of the rules.

#### TFF

##### Well-Known Member
You are showing off more money than you let on if you can build a Buffalo with a 2800 from scratch.

#### lr27

##### Well-Known Member
My guess is that in a few years, the sport class will be just as fast as unlimited.

#### Speedboat100

##### Well-Known Member
The days of upgrading and hot-rodding old warbirds are dead and gone. To have a competitive racer today requires a clean sheeet.

The R-2800 was invented introduced 1938.

I bet the designs to utilize it for speed were tested 1940-1945.

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#### Speedboat100

##### Well-Known Member
You are showing off more money than you let on if you can build a Buffalo with a 2800 from scratch.

Maybe I am a gambler too.

....or I make vocational schools make it for free.

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#### Voidhawk9

##### Well-Known Member
HBA Supporter
My guess is that in a few years, the sport class will be just as fast as unlimited.
The fastest sport class racers were faster than many of the unlimited this last year (2019).

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#### Speedboat100

##### Well-Known Member
How many of you has extra R-2800s lying around in your hangers ?

#### Speedboat100

##### Well-Known Member
The days of upgrading and hot-rodding old warbirds are dead and gone. To have a competitive racer today requires a clean sheeet.

But cars can be made to look racy too.

#### Victor Bravo

##### Well-Known Member
The R-2800 was invented introduced 1938.

I bet the designs to utilize it for speed were tested 1940-1945.
That is irrelevant. The R-2800 engine is still a perfectly good choice for an unlimited racer today, just as it was after WW2.

The problem with your idea is that the Brewster Buffalo is by far not the correct design for a racer. It was not a particularly fast aircraft at any time since it was first flown, and this has not changed in the last 80 years. Considering how few Buffalo's were built, and how few survive today, it would be a poor decision on every level, from historic preservation to racing competition.

The R-2800, mounted on another aircraft that is farl ess historically significant or rare (The Yak-11 trainer) has created a very usuable and competitive unlimited racer.

Making a purpose built racing airframe, using modern materials and engineering, and modern aerodynamic analysis methods, could easily yield a 500 MPH racer.

#### rhbelter

##### Member
HBA Supporter
2020-Feb 4th

Ahoy, HomeBuiltAirplanes,

Dark-of-the-night thoughts ::::

Reno Racers: Very high level development, but innovation ????

Sheeessh !!! And youse-guys want to build just another almost-the-same ‘critter’ as everyone else is flying ???? !!!!

It comes to my mind that the only significant innovative ‘things’ which I have seen there are vapor phase cooling, and (years ago), the clean-sheet Pond Racer.

At Reno, I was talking with an Aerothermodynamicist, (my thesis field) whose name, I no longer recall, but his was on more than half of the landing gear doors present.

My question was about vapor phase cooling endurance, and he noted that at low power, it was pretty good, with the P51 – so rigged -- having flown from Portland to Van Nuys.

The Pond Racer sounded like an immense window fan. He remarked that they were going to need to automate a lot more things, because the pilot workload with cooling doors and spray nozzles and all else was overwhelming. Unfortunately, no longer needed.

Sports Racers:

The Reno Go-Fast Sports Racer Rules: … ‘Aircraft are to be powered by an internal combustion engine or engines totaling no more than 1000 cu in.’

I’ve neither seen, nor heard any talk about a pair of 495 cu/in seriously hot engines installed in an appropriate --- say a tandem engine / tilt-wing / extension shaft airplane.

Of course, the extension shaft is no casual thing. A comprehensive dynamic analysis is in order, along with appropriately measured results. The development of such may well be made easier by using a clutch to de-couple the shaft during start, and up to some certain rpm.

BTW, a seriously dangerous soul is one with a shop full of high tech tools who can craft a PSRU, but is ‘unlettered’ in his ability to technically analyze the dynamics of his ‘creation’, nor is he capable of measuring the result.

Tandem engines were figured out by Bugatti 80 years ago. Too bad that the beautiful replica airplane did not have a proper dynamic shaft analysis / measurement. What I read about the loss was ‘clutch failure’. I’ll bet that a lot of unplanned for torsional dynamics were very involved with that clutch failure.

The wetted surface of such an airplane could be about the same as a single engine critter, and with twice the HP, I suggest that a well-done airplane like that would absolutely rule the Sport Racers, and scare the crap out of the unlimited guys.

WHY is such an airplane not seen??? I cannot be the only guy to have had such ideas.

I believe that there is plenty of \$ in the hands of the Reno Racers to do such. ??????

Enjoy /s/ Bob

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