# How to make a propeller driven aircraft go really fast ?

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#### Speedboat100

##### Well-Known Member
Some quidelines and examples can be found here: The 15 Fastest Propeller Driven Airplanes Of All Time

Minimal drag with extreme power to weight ratio with suitable propeller for the system.

What else...how can we get there with reduced power and energy capacity ?

Dive.

#### Speedboat100

##### Well-Known Member
Spruce Goose has power to weight ratio about 0.12 shp/kg....and Rare Bear at around 1.0-1.2.

Rare Bear went 528 mph and Spruce Goose around 200 mph.

Convince me with a better example how weight has little or nothing to go with the speed !

#### rv6ejguy

##### Well-Known Member
Spruce Goose has power to weight ratio about 0.12 shp/kg....and Rare Bear at around 1.0-1.2.

Rare Bear went 528 mph and Spruce Goose around 200 mph.

Convince me with a better example how weight has little or nothing to go with the speed !
Think maybe the Spruce Goose has a bit more wetted area...

#### Vigilant1

##### Well-Known Member
Spruce Goose has power to weight ratio about 0.12 shp/kg....and Rare Bear at around 1.0-1.2.

Rare Bear went 528 mph and Spruce Goose around 200 mph.

Convince me with a better example how weight has little or nothing to go with the speed !
Sorry, but that's a ridiculous example because it doesn't address drag. which is the issue.

Speedboat/Topspeed, enough.

#### Speedboat100

##### Well-Known Member
Sorry, but that's a ridiculous example because it doesn't address drag. which is the issue.

Speedboat/Topspeed, enough.

HK-4 was vely clean plane.

Stemme 12 motorglider has very similar specs with it.

It has 0.127 hp/kg and 161 mph topspeed.

Having bigger re-number the HK-4 is slightly on top.

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Europa XS Monowheel ( very low drag ) reaches the Spruce Goose speed at 0.185 hp/kg.

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#### WonderousMountain

##### Well-Known Member
The De havilland Hornet is a good example of Speed/power ratio.
Add a pusher engine, and mount an inverted V tail off the outboard
engine Nacelles. You'll need a kinda big tail gear leg, deal with it.

#### henryk

##### Well-Known Member
=TU-95 bomber=CR propellers=950 km/h

#### Victor Bravo

##### Well-Known Member
Wow, Henryk made two entire posts that didn't mention the Kasperwing.... where the hell is Rod Serling when you need him?

(Just kidding Henryk, the Kasperwing legacy needs to be kept alive )