Talk:Bell 212

Disambiguation

The Bell 212 (Bell 212A ? ) was the first commercial 1200 baud modem in the United States - and the modem protocol it uses is still supported by modern modems for communicating at 1200 baud in the US.

—Hobart 05:52, 18 July 2005 (UTC)

mexico operates these

On the mexican air force page it sais that mexico is an operater but here it sais that it is not. —Preceding unsigned comment added by B1412 (talk • contribs) .

But Mexico is in the list on the military UH-1N Twin Huey page. Maybe that is where the link from the Mexican Air Force page should go. Meggar 01:33, 20 July 2007 (UTC)

Mexico received about 75 old Twin Hueys from the USA but Mexico sent them back as were worn out. —Preceding unsigned comment added by BatteryIncluded (talk • contribs)

The sound

One of the characteristics of the 212 in comparison to most heli's is the extremely long-distances at which they can be heard as they approach you. I remember hearing one approach from well over 15 km as a kid, and recently almost repeated this feat (10 km at least) at Whistler. The "whump whump" sound it totally unique in my experience, but I haven't heard an original UH-1...

So what causes this sound? The 412 definitely doesn't make it, at least to anywhere near the same amount. It doesn't sound like the sort of "sonic whine" you get from high-speed props either. So anyone know what the cause of this is?

Maury 18:15, 31 August 2007 (UTC)

UN Peacekeeping Air Unit

This operator was added by User:202.37.68.34. I have fact tagged it because I cannot find any reference to such a unit. In my experience flying 212s for the UN in Central America they contract companies to provide aircraft or ask nations to provide military aircraft on an ad-hoc basis. As far as I can find out there is no "UN Peacekeeping Air Unit". Can someone else add any clarification to this? If not then I will remove it. - Ahunt (talk) 12:06, 28 October 2008 (UTC)

A search has turned up no evidence this unit exists, so I have removed it. If anyone can find a ref please feel free to add it back in. - Ahunt (talk) 12:27, 29 October 2008 (UTC)

Performance and General Information

I know I'm a new user but i would like to add or maybe sign in some what i know from experience what I think is more accurate about the Bell 212.

As a personal operator of the aircraft these are the numbers written on the aircraft's flight manual (E-AB212-PT6T-1) (12-9-1997)

Crew: 1 (two for IFR operation)

Capacity: 15

Length: 57 ft 3.25 in (17.456 m)

Rotor diameter: 48 ft (14.63 m)

Height: 14 ft 4.41 in (3.83 m)

Disc area: 1,809.5 ft² (168.3 m²)

Empty weight: 6529.4 lb (2961.7 kg)

Max takeoff weight: 11,200 lb (5,080 kg)

Powerplant: 2 (two)× Pratt & Whitney Canada Twin Pack PT6T-3 or -3B (2 PT6s driving a common gearbox) turboshaft, 2 x 900 shp (PT6T-3); or 2x 937 shp (PT6T-3B)

Performance

Never exceed speed (7500 lbs or less) : 130 knots Reduced by 3 kts per 1000 Above 3000 ft AMSL

Maximum speed: 130 knots

Cruise speed: 80 knots

Service ceiling 20'000 ft

Rate of climb: 1,745 ft/min (532 m/min)

Disc loading: 6.19 lb/ft² (300.5 kg/m²)

Thank You Bu3aDeL Bu3aDeL (talk) 15:18, 3 November 2008 (UTC)

Thanks for your comment here. Because Wikipedia is an encyclopedia and not an aircraft flight manual it only includes key numbers and not all available specs on any given aircraft. The templates only support certain specs to prevent the inclusion of numbers from getting out of hand. The templates have been worked out through the building of consensus amongst editors working on the Wikipedia:WikiProject Aircraft over several years. They are subject to change from time to to time. I would suggest you have a look at the project pages, in particular the talk page for the templates and consider joining the project to participate in the discussions of what specs go into the templates. - Ahunt (talk) 15:28, 3 November 2008 (UTC)

The spec list a newer flight manual version as reference: Bell 212 Rotorcraft Flight Manual BHT-212IFR-FM-1 revision 3, 1 May 1998. -Fnlayson (talk) 15:36, 3 November 2008 (UTC)

The specs above are also for a different version, the Agusta AB212, so may be different on that basis, too. - Ahunt (talk) 15:40, 3 November 2008 (UTC)

For years, the article has said that the B212 has one engine, when in fact it's a twin. But I don't understand how to use the provided template.Santamoly (talk) 09:12, 29 December 2016 (UTC)

Corrected, it is an old template and uses "number of props" to mean number of engines ! MilborneOne (talk) 15:48, 29 December 2016 (UTC)

It's always been my understanding that the PT6T is treated as one engine, though with two coupled PT6 power sections. That's why it listed one engine in the specs, as it doesn't have two PT6Ts installed. - BilCat (talk) 15:57, 29 December 2016 (UTC)

Bill is right, it is a single engine unit with two power sections. - Ahunt (talk) 16:03, 29 December 2016 (UTC)

My printed sources also list the Bell 212 and 412 as having one PT6T engine, not two. See here for an online source that is a reprint of a paper source. - BilCat (talk) 16:06, 29 December 2016 (UTC)

The PT6T is actually an engine that consists of two PT6 power sections and a combining gearbox that outputs their combined torque to a shaft to the transmission. Even though it has two "power sections" it is a single engine by itself. The military call the combined set up a T400. - Ahunt (talk) 16:12, 29 December 2016 (UTC)

Thanks for clarification, is it true for some of the other twin hueys like UH-1Y which says two-engines! MilborneOne (talk) 16:56, 29 December 2016 (UTC)

No, the UH-1Y uses 2 General Electric T700 engines. - BilCat (talk) 17:19, 29 December 2016 (UTC)

The Armstrong Siddeley Double Mamba used in the Fairey Gannet also had two power sections with a combining gearbox. To my knowledge, the Gannet is considered a single-engine aircraft, and our specs section lists only 1 engine. - BilCat (talk) 19:50, 29 December 2016 (UTC)

To a large extent this is really just a wording issue. I flew UH-1Ns/CH135s/212s for two decades and most people, including pilots and mechanics, talk about them as being a twin-engined 205. Officially it is a "single engine with two power sections", but it could just as easily been called "two engines connected to a common gearbox". That said, at any weights above pretty much "empty" the second engine just takes you to the scene of the crash. It doesn't sustain altitude well on one "power section" at heavier weights. Landing it on one "power section" without over-temping, over-torquing or over-speeding it takes a very flat approach and a run-on landing, too, even at near empty weights. - Ahunt (talk) 23:11, 29 December 2016 (UTC)

Assessment comment

The comment(s) below were originally left at Talk:Bell 212/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

==Start== Born2flie: Merely acquiescing to the WP:MILHIST assessment of the article. --18:08, 31 December 2006 (UTC)

Last edited at 18:08, 31 December 2006 (UTC). Substituted at 09:22, 29 April 2016 (UTC)

Remove info about Iran crash

Panha Shabaviz 2-75 (an unlicensed reverse-engineered local copy of Bell-204/205) was involved in the accident. Iran used a limited quantity of Italian-built AB212 in naval roles only. 2601:644:8102:6D10:2C94:922B:8C59:B5FC (talk) 05:23, 20 May 2024 (UTC)