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HWB function like more or less like an augmentor. It's all the airframe that works in symbiose to reach a better level of efficiency. The difficulty comes with the proulsive system and airflow distorsion at certain flight regime (low speed is one). Hence the model with representative bolted-on slats and flaps.

Boeing has already worked hard that flight domain.

For a century designer have mostly decoupled the airframe and its propulsive means. Stepping firmly into the futute is to get that right... from low speed to high speed.

(Woaw got straped in gradiloquence. Sorry if that sounded pedentic).

Weight of the gear associated with the raised nose may not make its way onto an already astronomically expensive aircraft.
Why astronomically expensive?  It's not a stealth aircraft.
That is what the USAF Inc. told their primary customer last time they asked.

What?  The USAF has customers?  They told them it wasn't a stealth aircraft?  They told them it would be expensive?  Who is the customer and who is "USAF Inc."?

The United States Army is the primary customer.
Is the G6-52L (25-litre chamber, ER variant) still being promoted by Denel Land Systems or did they decide to focus their efforts on the JBMoU-compliant G6-52 (23-litre chamber) ?

From Jane's :

Assegai aims to squeeze more reach out of NATO howitzers
Rupert Pengelley - Jane's International Defence Review
10 November 2017

A 70 km-range version of the Assegai 155 mm artillery projectile, fully compatible with NATO-standard extended-range ordnance systems, is in its concept study phase within the German-South African company Rheinmetall Denel Munition (RDM).

This level of performance was demonstrated as far back as 2006 by the then Denel Naschem with the M9703 hybrid base-bleed/rocket-assisted Velocity Enhanced Artillery Projectile (VLAP) version of its Extended-Range Full-Bore (ERFB) 155 mm artillery projectile. In that instance the ERFB VLAP projectile was fired from Denel’s G6-52L self-propelled howitzer fitted with a Losvoor 52-calibre/25-litre tube and using a charge comprising six M64A1 propellant modules to give it a muzzle velocity of 1,015 m/s. However, neither the 48 kg M9703 projectile; its associated charge system; nor the Losvoor ordnance system (which is no longer being marketed by Denel), are compliant with NATO’s Joint Ballistics Memorandum of Understanding (JBMOU). The latter constrains projectile weight to 43.5 kg and chamber volume to 23 litres.

The established Assegai JBMOU-compliant 155 mm projectile family does already include two VLAP variants: the M2005 high-explosive (HE) projectile filled with 4.3 kg of TNT/HNS and featuring natural fragmentation, and the M0256 IHE-PFF version with press-filled PBX4 insensitive explosive and pre-formed fragments (PFF). In a standard atmosphere both can be fired to 41 km out of a 39-calibre/18-litre tube (muzzle velocity [m/v] 827 m/s), and to 54 km out of a 52-calibre/23-litre tube (m/v 950 m/s), respectively using JBMOU-compliant five-module and six-module charges.

The new Assegai VLAP projectile, informally designated VLAP 70, is planned to be fired using a newly developed unitary top charge. This will exploit the Assegai’s in-built permissible individual maximum pressure margin (PIMP 450MPa) and will be specifically matched to the 23-litre chamber volume of the JBMOU 155mm/52-calibre ordnance system. It will be filled with a modified version of the R5733 propellant used in RWM’s current DM92 charge module, and will impart a muzzle velocity in excess of 1,000 m/s to the projectile. The pressure/time curve will be kept within the gun’s standard operating pressure limits by the incorporation of a bespoke ignition system.

VLAP 70 would thus effectively match the range performance being claimed for Leonardo’s rival sub-calibre (92 mm) unguided Vulcano BER long-range HE projectile when fired from a similar 155 mm ordnance system (in Vulcano BER’s case using four standard DM92 modules to supplement the projectile’s integral charge increment). Norway’s Nammo is also working on a ramjet-boosted HE-ER round with an estimated 90 km range. RDM experimented with ramjet technology in the early 2000s but discontinued the ProRam projectile due to the lack of a User Requirement.

All such extended range projectiles contain reduced HE payloads (4.3 kg in the case of VLAP) in comparison with standard unassisted 155 mm projectiles, but this has been offset in RDM’s Assegai M0603 IHE PFF projectile through improvements in fragmentation characteristics. Crucially also the ability to fit them with course-correcting fuzes now potentially enables such projectiles to be placed within a radial distance of 30 m or less of the target, out to their maximum range.
If I dare say so - that is a weird looking slat!
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TSH-3 original drawings and one of very rare pic
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IT sheme
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OPB with M-37P engine
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