Hindustan Trainer HTT-40

Rushil51

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so we were struggling to develop a prop till now? What is so important in this achievement? I am not aware of the program but can some one put brief info. thanks.

This is not our first prop plane. We have HAL Krishak, HAL Pushpak etc. Well there is nothing "new" about it expect that it is a modern BTA which will serve alongside Pilatus. How ever it is still an important development.

And there was talk sometime back that it may have an armed version similar too Super Tucano.
 

porky_kicker

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Why are prototype aircrafts always painted in yellow?o_O
primer coating
very basic yellow chromated primer

maybe Zinc Chromate Yellow

Zinc Chromate is a corrosion resistant agent that is added to certain coatings. chromate finishes/coatings including Zinc Chromate provide superior corrosion resistance. Additionally, Zinc Chromate is highly toxic thus protecting the surface from proliferation of organic matter.
It provides a base for the top coat or paint, a barrier between harmful elements during maintenance/flight testing period and in atmosphere to prevent surface corrosion of base metal.it prevent corrosion of base metal eg Aluminum by giving a cathodic protection. Zinc is anodic to Aluminum thus susceptible to corrosion and hence save aircraft structure from galvanic corrosion.
 

tejas warrior

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indiatester

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I saw the HTT40 fly by an hour back. It flew at a fairly low altitude. Unfortunately it few out of range before I could click a picture.
It was bigger than I had thought (bigger than a bus IMO) and looked nice!
 

Saichand K

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It is primer. If there is any crack in body, it will become immoderately visible. That is why.
Actually, they will be painted that way only for metallic parts of the frame. If we see Tejas NP-2,3 they are not completely yellow. The yellow primer coating is a special zinc chromate coating on metal parts to prevent corrosion. Since HTT-40 is a all metal air-frame it is completely coated with yellow zinc chromate. However, I would like to see composites being used in HTT-40 prototypes as well.
 

abingdonboy

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http://www.defenseworld.net/news/16...t_Indigenous_HTT_40_Trainer_Soon#.V2FtzjV97IV

Indian Air Force To Flight Test Indigenous HTT-40 Trainer Soon

The Indian Air Force is eyeing to officially demonstrate the trial flight of its indigenous basic trainer aircraft HTT-40 in the next few days.

The formal test flight could take place sometime later this month or in early July, the Hindu quoted sources in the Ministry of Defense as saying Sunday.

Ever since the BTA's first prototype made its first 30-minute test sortie on May 31, it has been frequently airborne as part of the developmental exercise, the sources said.

The outcome of the early trial flights has been encouraging, they said.

HTT-40 (Hindustan Turbo Trainer), powered by a Honeywell engine, is being developed as the first level trainer for fresher pilots of the Air Force at the Aircraft Research & Development Centre of the Hindustan Aeronautics Ltd.

Although the small BTA would not count as a flagship of the HAL which has designs on bigger planes, internally the progress of the locally designed and developed trainer is seen as a morale booster.

When it gets its flight certification, as many as 68 of the trainers are set to be part of the IAF's I81 basic trainers.

The 113 imported Swiss-made Pilatus PC-7 MkII aircraft will be the other pilot training component.
The numbers are waaaay off here. Only 75 PC-7s were ordered. The IAF still requires 120++ BTT that the HTT-40 will fit the bill and the IN will look to induct at least 40 for themselves.
 

abingdonboy

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so we were struggling to develop a prop till now? What is so important in this achievement? I am not aware of the program but can some one put brief info. thanks.
The project was only cleared a few years ago. It wasn't a question of struggling, the know how is there but as always it was mindset and bureaucracy that was holding them back.
 

sasum

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primer coating
very basic yellow chromated primer

maybe Zinc Chromate Yellow

Zinc Chromate is a corrosion resistant agent that is added to certain coatings. chromate finishes/coatings including Zinc Chromate provide superior corrosion resistance. Additionally, Zinc Chromate is highly toxic thus protecting the surface from proliferation of organic matter.
It provides a base for the top coat or paint, a barrier between harmful elements during maintenance/flight testing period and in atmosphere to prevent surface corrosion of base metal.it prevent corrosion of base metal eg Aluminum by giving a cathodic protection. Zinc is anodic to Aluminum thus susceptible to corrosion and hence save aircraft structure from galvanic corrosion.
Actually, the reason is more mundane like why school-buses are painted yellow..obviously for greater visibility in low light. Anti-corrosion properties of aircraft body are desirable for trainer, fighter, passenger, cargo aircrafts alike. Take for example, F-16, block-50. This is made of 80% aluminium, but painted dark gray. This has not made F-16 airframe any fragile. It has around 8000 hrs. (largest) of life expectancy, compared to Tejas's 3000 hrs., with all composite materials. The yellow painting tradition was started by RAF, but it is no more followed around the world. For more, read the article below:
Training Aircraft Colour Schemes
RAF training aircraft have sported a number of colour schemes over the years. The basic idea was to improve visibility of training aircraft and therefore reduce the number of potential accidents. Some schemes have proved more successful than others. Below are some of the main schemes used by the RAF.


A bright yellow colour scheme was in wide-spread use during the inter-war period (1918-1939). It was believed that yellow would make the aircraft stand out but in practice this was not always the case.


An overall silver finish with yellow bands was the paint scheme favoured in the late 1950s/early 1960s. The small yellow bands were not always clearly visible, however.


In the mid-Sixties a grey scheme with "dayglo" orange was introduced. The fluorescent orange was very visible but the paint faded quickly. The paint was replaced with sticky-backed vinyl but this proved quite expensive.


In the early 1970s a grey, white and red paint scheme was adopted and applied to all training aircraft.


Today all training aircraft are painted gloss black. In trials this proved to be the most visible colour against all daytime skies.
 

Saichand K

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Actually, the reason is more mundane like why school-buses are painted yellow..obviously for greater visibility in low light. Anti-corrosion properties of aircraft body are desirable for trainer, fighter, passenger, cargo aircrafts alike. Take for example, F-16, block-50. This is made of 80% aluminium, but painted dark gray. This has not made F-16 airframe any fragile. It has around 8000 hrs. (largest) of life expectancy, compared to Tejas's 3000 hrs., with all composite materials. The yellow painting tradition was started by RAF, but it is no more followed around the world. For more, read the article below:
Training Aircraft Colour Schemes
RAF training aircraft have sported a number of colour schemes over the years. The basic idea was to improve visibility of training aircraft and therefore reduce the number of potential accidents. Some schemes have proved more successful than others. Below are some of the main schemes used by the RAF.


A bright yellow colour scheme was in wide-spread use during the inter-war period (1918-1939). It was believed that yellow would make the aircraft stand out but in practice this was not always the case.


An overall silver finish with yellow bands was the paint scheme favoured in the late 1950s/early 1960s. The small yellow bands were not always clearly visible, however.


In the mid-Sixties a grey scheme with "dayglo" orange was introduced. The fluorescent orange was very visible but the paint faded quickly. The paint was replaced with sticky-backed vinyl but this proved quite expensive.


In the early 1970s a grey, white and red paint scheme was adopted and applied to all training aircraft.


Today all training aircraft are painted gloss black. In trials this proved to be the most visible colour against all daytime skies.
Prototypes or any unpainted aircraft is coated with zinc chromate primer to prevent corrosion. Paint job is done later over these primer coating. It has nothing to do with trainer aircraft alone. It is applicable for all planes. Even prototypes of Tejas has this.
 

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