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-   -   W.A.Mair's boat-tail (https://ecomodder.com/forum/showthread.php/w-mairs-boat-tail-39815.html)

aerohead 11-08-2021 03:51 PM

W.A.Mair's boat-tail
 
Let's see if this works
https://ecomodder.com/forum/showthre...9-a-23877.html

freebeard 12-06-2021 08:21 PM

https://innerspacenetwork.files.word..._vehicle.0.jpg
hinnerspacenetwork.wordpress.com/2021/12/05/rocket-labs-next-generation-launch-vehicle-neutron/

The CEO, Peter Beck, says making the aft end bigger than the nose increases aerobraking so they don't need heat tiles.

Piotrsko 12-07-2021 09:23 AM

You only need heat resistant tiles if you re-enter in a hurry. If you do the skip re entry technique, stainless works fine. Rutan uses carbon fiber.

freebeard 12-07-2021 01:09 PM

A caliper held to the screen suggests ~50% greater diameter at the aft end. One wonders if it makes a difference on the way up.

Also the effect of four supersonic shock waves from the four protruding landing legs.

aerohead 12-09-2021 11:18 AM

aero braking
 
Does she come in aft- first at all times, or nose-first, then transition?

aerohead 12-09-2021 11:33 AM

way up
 
Quote:

Originally Posted by freebeard (Post 660111)
A caliper held to the screen suggests ~50% greater diameter at the aft end. One wonders if it makes a difference on the way up.

Also the effect of four supersonic shock waves from the four protruding landing legs.

Under rocket thrust, the expanding gases act as a virtual structural boat-tail. The drag will vary from subsonic- to- transonic-to- supersonic.
A larger rear cross-section is like arrow feathers.
On all launches, you'll here cap-com announce ' max-Q', where the airframe is experiencing the highest aerodynamic loading of the flight.
If the 'tube' isn't crushed by then, between payload and thrust, or deformed by aeroelasticity, the engineers have made a successful design.
And as P. has mentioned, if intermittent thrusting, never allows the tube to exceed its aerodynamic heating threshold velocity, it won't need tiling.

freebeard 12-09-2021 01:14 PM

Quote:

Does she come in aft- first at all times, or nose-first, then transition?
The videos I've seen looks like it comes in tail first like the Falcon, not belly-flopping like the Starship. That rotation must be a wild ride.

The built-in landing legs eliminates the mid-air catching system.


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