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The Bar / Re: Speed King,Was it a Target or Airplane Model ?
« Last post by hesham on Today at 04:02:19 pm »
Thank you Ray and Richard.
Aerospace / Re: SpaceX (general discussion)
« Last post by flanker on Today at 03:42:13 pm »
New gridfins make an appearance;

They are larger, made of forged titanium, are unpainted and have a different pattern.
USN eyes HELIOS for laser weapon fit on DDG 51 Flight IIA destroyer

The US Navy (USN) is advancing a fast-track plan to test a high-energy laser weapon system on a DDG-51 Arleigh Burke-class guided missile destroyer.

A request for proposal (RFP) for what the navy now refers to as the High Energy Laser with Integrated Optical-dazzler and Surveillance (HELIOS) system was released by the Naval Sea Systems Command (NAVSEA) on 18 June, with responses due for return no later than 18 August. HELIOS was previously known by the names Seasaber Increment 1 and Surface Navy Laser Weapon System.

The HELIOS project is focused on accelerating the fielding of laser weapon systems to the fleet, with an incremental approach for increasing capability as laser technology matures. "HELIOS will leverage proven mature technology to field a 60-150 kW class High Energy Laser (HEL), along with an integrated Counter Intelligence, Surveillance and Reconnaissance (C-ISR) laser for non-destructive dazzling capability against UAV [unmanned aerial vehicle]-mounted sensors," said NAVSEA. "The project will deliver weapon systems to the fleet as quickly and affordably as possible, providing modularity where practicable for future capability enhancements."

According to the RFP, HELIOS will initially deliver two test units in fiscal year (FY) 2020 - one for a DDG 51 Flight IIA destroyer and one at a Land Based Test Site - and will provide options for additional units in FY 2021 and beyond. To meet accelerated programme delivery timelines within fiscal constraints, HELIOS will prioritise technical maturity and proven laser weapon concepts, said NAVSEA, adding that the overall design "shall ensure that all components satisfy the safety, security, and installation requirements for a DDG 51 Flight IIA surface combatant".
The Bar / Re: Speed King,Was it a Target or Airplane Model ?
« Last post by Richard N on Today at 02:47:04 pm »
Amato Prati's SPEED KING

Here is of a paper model of Amato Prati's SPEED KING control line speed model:;id=9;url=http%3A%2F%2Fdigilander%2Elibero%2Eit%2Fucontrol2000%2FU-Control-2000%2Fpaperindex%2Ehtm

There is a category of control line flying for speed with classes based on motor displacement.  It was powered by a high rpm 2 cycle single cylinder motor run on a mix of nitromethane, methanol, and caster oil.  The braided steel control lines are about 50 feet long with two lines controlling the elevator for pitch control.

The Speed King is a 50s vintage model with a light metal belly pan and the rest of the model is made of balsa, basswood, maple, and plywood.  Modern speed models are mostly light metal and composites with a single inboard wing.

Here is a video of 2013 control line speed flying: 

Space Projects / Re: ARCA Haas 2CA rocket (SSTO with aerospike engine)
« Last post by Zootycoon on Today at 01:05:03 pm »
There's no "combustion chamber" on the demonstrator;- it's a cold rocket using decomposed HTP;- they claim this can get into space? They're also assuming 1g acceleration as well as there's no inertia factor on the tank pressure.

I've not figured out the tank construction yet but it's not following the route I would expect for a filament wound structure but "it's the lightest such pressurised tank ever made"?

Yet to see any sign of carbon or vacuum bag consolidation or auto-clave. It's either staggeringly clever or ........   

First commercial payload launch in just under 2 years

At least it's entertaining so I'll await next instalment with interest.

The Bar / Re: Speed King,Was it a Target or Airplane Model ?
« Last post by Ray on Today at 12:18:56 pm »
It is a control line model.  The lines are visible out of the wings. 
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