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Search: Posts Made By: harpf
Showing results 1 to 28 of 28
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Forum: North America
7th Aug 2017, 08:02
Replies: 26
Views: 13,483
Posted By harpf

Wrong answer! In a twin with propellers mounted...

Wrong answer! In a twin with propellers mounted on the wings. 1/2 ball towards the good engine is closer to zero side slip, with the failed engine fully feather. It is closer to full ball if...
Forum: North America
7th Aug 2017, 07:39
Replies: 22
Views: 14,747
Posted By harpf

If one follows the FAA instruction form before we...

If one follows the FAA instruction form before we went all scenario The CFI/II/MEI gets plenty of hands on time. 1) Instructor does and explains the maneuver as he does, 2) the student explains the...
Forum: Freight Dogs
7th Aug 2017, 06:38
Replies: 8
Views: 11,137
Posted By harpf

My calling card reads "'adventurer/...

My calling card reads "'adventurer/ sadomasochist/ stick & rudder lover" I found towing signs great fun. Teaching multi to freshly minted COM pilots in my Apache and then 310 was good sport. Esp...
Forum: Tech Log
6th Aug 2017, 03:03
Replies: 81
Views: 23,208
Posted By harpf

A military fire control / search radar is total...

A military fire control / search radar is total oblivious to other radar system. On the other hand the US military and US homeland security have systems that can identify both opposition and civil...
Forum: Tech Log
5th Aug 2017, 11:01
Replies: 81
Views: 23,208
Posted By harpf

I'm an EE having working a significant part of my...

I'm an EE having working a significant part of my career in radar systems integration and test.. and a tight wad as well. On my personal aircraft I always keep the radar on. If your concerned about...
Forum: Rumours & News
5th Aug 2017, 08:52
Replies: 1,219
Views: 776,909
Posted By harpf

Our airline has HW RASS system when they close a...

Our airline has HW RASS system when they close a runway open new one etc we get false alarms until the data base is fixed, That said it will advise if you attempt to land or depart on a taxi way
Forum: Tech Log
5th Aug 2017, 08:36
Replies: 7
Views: 9,034
Posted By harpf

Garret beta in a 331 powered Merlin

Flight idle has is a mechanical stop - pull the lever past the stop and your in reverse. There was no squat switch lockout on my Merlin. In fact on a short field I would get it clear the stop during...
Forum: Engineers & Technicians
5th Aug 2017, 08:17
Replies: 3
Views: 1,886
Posted By harpf

TPE 331

Last I checked, I have a full set of 331 dash 10 paper shop manuals - Also have flight safety in-doc systems book for the metro merlin
Forum: Tech Log
5th Aug 2017, 08:06
Replies: 9
Views: 7,104
Posted By harpf

NTS

On the 331 after shop visit a test is required to check the NTS RPM. This done to ensure the engine windmills above 28%. The target is 32% as I recall. This done by shutting off the fuel and...
Forum: Rumours & News
30th Oct 2016, 01:30
Replies: 67
Views: 70,915
Posted By harpf

Sink Rate

In a few days the FDR data should be available.


In the two previous FedEx MD-10 gear failures one was the result of a vendor error on the gear boss plating, and the other was a higher than...
Forum: Tech Log
27th Aug 2016, 04:33
Replies: 64
Views: 15,889
Posted By harpf

1) Doing a bit of math my help the beginner to...

1) Doing a bit of math my help the beginner to understand the limitations and trade space available to when flying the maneuver. The FAA has taken a crack at this for no wind with for us when setting...
Forum: Tech Log
31st Oct 2015, 11:13
Replies: 205
Views: 43,082
Posted By harpf

Remotely piloted with autonomous operation as an emergency condition vs HAL acting a

Keep in mind that current designs being looked at are remotely piloted with autonomous operation as an emergency condition vs HAL acting as PIC.

The first step is to automate the QRM, the second...
Forum: Tech Log
31st Oct 2015, 07:39
Replies: 205
Views: 43,082
Posted By harpf

Cool Pilots are cheaper than billions ?

Assuming 50,000 pilots flying for flag carriers at $200,000 per year, the annual pay for airline pilots is 10 billion a year.

At current crew pay rates, 30 billion dollars of R&D is reasonable...
Forum: Private Flying
2nd Feb 2013, 12:56
Replies: 8
Views: 2,108
Posted By harpf

Snoop I'd say so

No mention of a large bang ot rough engine, I'd say fuel startvation. Hate to say it happen to me after 30 years of flying in a belanka, 20 gallons on board, Got lucky, was on short final made the...
Forum: Rumours & News
29th Jan 2013, 12:20
Replies: 2,185
Views: 1,031,796
Posted By harpf

Never Used

I/m sure the battery is load tested on a regular bases, perhaps before every flight.
Forum: Rumours & News
29th Jan 2013, 12:18
Replies: 2,185
Views: 1,031,796
Posted By harpf

Lithium-Manganese, vs Cobalt vs Iron

I would expet the final design to switch to LFP these are the very saftest Li chemistry. Much better weight then Pb or Nicad long cycle life. Slightly more weight than most other Li chemistry :8
Forum: Rumours & News
25th Jan 2013, 03:43
Replies: 266
Views: 117,869
Posted By harpf

Not so with LiFePo4

you can run them at 3.2v cell charge or discharge very flat. Pb are the worst they wont put out much unless you take them well under 2v cell and need 2.25v cell to at take a decent charge
Forum: Rumours & News
25th Jan 2013, 03:38
Replies: 266
Views: 117,869
Posted By harpf

Wires to Monitor cell voltage

that's why all the lose wires, but they can just as easly cause a problem as prevent one. On a battery system I'm working on all the monitor wires are sleved to help keep them as part of the...
Forum: Rumours & News
25th Jan 2013, 03:28
Replies: 266
Views: 117,869
Posted By harpf

Must be simplicfation in the dwg

:ugh:As it a wild frequency AC it can't posibly be in phase
Forum: Rumours & News
22nd Jan 2013, 12:22
Replies: 2,185
Views: 1,031,796
Posted By harpf

Cost of 200lb

x 20 years 2M/200 rule of thumb, serveral $1,000 per / pound is what will be paid to get a pound out of a large aircarft (per aircarft). Or 1M could invested in engieering, to get a pound out of new...
Forum: Rumours & News
22nd Jan 2013, 12:08
Replies: 2,185
Views: 1,031,796
Posted By harpf

Drom what I know of

All MC (small) batteries are made in China, Larger batteries(Car, Truck) are still made in the USA
Forum: Rumours & News
8th Jan 2013, 16:17
Replies: 263
Views: 106,248
Posted By harpf

Lithium Manganese

They should be much better from a safty POV than Cobalt
Forum: Rumours & News
8th Jan 2013, 15:01
Replies: 263
Views: 106,248
Posted By harpf

Electrolyte

Lithium salts are always the electrolyte in a Li-Ion battery. It is what the plates (anode, cathode) are madeof that differs between types.
Forum: Rumours & News
8th Jan 2013, 12:49
Replies: 263
Views: 106,248
Posted By harpf

Li-Po

It seems that they 787 may have RC copter / Cell Phone 'LiPo'. That is a brave engeering team to put LiPo in an aircraft. I guess they think if they can do Level A SW for FBW so they can Level A...
Forum: Rumours & News
8th Jan 2013, 12:37
Replies: 263
Views: 106,248
Posted By harpf

LiPo vs NiCad

Several aircraft were lost with NiCad Runaway, most any battery including SLA can do it. The key is the charging and protection system, Gulfstream 680 has some LiFePo4 on it.

One solution is to...
Forum: Rumours & News
8th Jan 2013, 12:20
Replies: 263
Views: 106,248
Posted By harpf

Thank you for the link - I saw the press releases on Yuasa

On the Yusau site I could not find a link to the data sheetwith Co3O4 as the actual chemistry.

As an aside. I'm working with Headway LFP batteries forturbine starting. A size that fits in the...
Forum: Rumours & News
8th Jan 2013, 01:06
Replies: 263
Views: 106,248
Posted By harpf

How does one define commercial aircraft

Some Cessna citations had A123 LFP starter (main) batteries,until one caught fire. It seems they failed to consider what happens if youconnect a 2000 amp Hobart to a fully discharged 40AH LFP...
Forum: Rumours & News
8th Jan 2013, 00:40
Replies: 263
Views: 106,248
Posted By harpf

Type of Battery In 787

Li-ION cover a broad range of Li Chemistries - Any one know what is acutaly in 787 Li-ION battery?:confused:
Showing results 1 to 28 of 28


 
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