If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
|
#1
|
|||
|
|||
28 volt pitot heat
Will running a 28 volt pitot tube heat on 12 volts heat it enough to use? I
keep seeing 28 volt pitot tubes on e-bay and was wondering if they would do the job. Dan, U.S. Air Force, retired |
#2
|
|||
|
|||
No. A 28 volt pitot on a 14 volt system will only develop 1/4 of the
design wattage. I feel your pain; the price of pitot tubes these days is absolutely, downright obscene. Rip B2431 wrote: Will running a 28 volt pitot tube heat on 12 volts heat it enough to use? I keep seeing 28 volt pitot tubes on e-bay and was wondering if they would do the job. Dan, U.S. Air Force, retired |
#3
|
|||
|
|||
On Fri, 26 Mar 2004 23:57:43 GMT, rip
wrote: :No. A 28 volt pitot on a 14 volt system will only develop 1/4 of the :design wattage. I feel your pain; the price of pitot tubes these days is :absolutely, downright obscene. : :Rip : :B2431 wrote: : Will running a 28 volt pitot tube heat on 12 volts heat it enough to use? I : keep seeing 28 volt pitot tubes on e-bay and was wondering if they would do the : job. Keep watching Ebay, I picked up a 12 and a 24 as a package for $18, new old stock. |
#4
|
|||
|
|||
Hummmmm
If you take a ceap 12v to 110 ac power inverter from Radio Shack and tack a 24-30 volt bell transformer with a rectifier and filter on the output you could make your own 12v to 24 volt dc converter for about $20-$30 dollars. Ask Jim Weir if he can come up with a project ;-) John Richard Riley wrote: On Fri, 26 Mar 2004 23:57:43 GMT, rip wrote: :No. A 28 volt pitot on a 14 volt system will only develop 1/4 of the :design wattage. I feel your pain; the price of pitot tubes these days is :absolutely, downright obscene. : :Rip : :B2431 wrote: : Will running a 28 volt pitot tube heat on 12 volts heat it enough to : use? I keep seeing 28 volt pitot tubes on e-bay and was wondering if : they would do the job. Keep watching Ebay, I picked up a 12 and a 24 as a package for $18, new old stock. |
#5
|
|||
|
|||
Actually I just looked up the current requirements and that would not work!
I have found a site (www.solarseller.com) that carries the Solar Converters, inc line of converters. (model cv 12/24 - 50r24 looks to be what your need but check with them) it appears to cost around $175.00 I don't know how cost effective that is! Just a possibility John UltraJohn wrote: Hummmmm If you take a ceap 12v to 110 ac power inverter from Radio Shack and tack a 24-30 volt bell transformer with a rectifier and filter on the output you could make your own 12v to 24 volt dc converter for about $20-$30 dollars. Ask Jim Weir if he can come up with a project ;-) John Richard Riley wrote: On Fri, 26 Mar 2004 23:57:43 GMT, rip wrote: :No. A 28 volt pitot on a 14 volt system will only develop 1/4 of the :design wattage. I feel your pain; the price of pitot tubes these days is :absolutely, downright obscene. : :Rip : :B2431 wrote: : Will running a 28 volt pitot tube heat on 12 volts heat it enough to : use? I keep seeing 28 volt pitot tubes on e-bay and was wondering if : they would do the job. Keep watching Ebay, I picked up a 12 and a 24 as a package for $18, new old stock. |
#6
|
|||
|
|||
From: UltraJohn
Hummmmm If you take a ceap 12v to 110 ac power inverter from Radio Shack and tack a 24-30 volt bell transformer with a rectifier and filter on the output you could make your own 12v to 24 volt dc converter for about $20-$30 dollars. Ask Jim Weir if he can come up with a project ;-) John Richard Riley wrote: I wouldn't think you'd need to filter it. or rectify it. I bet the heater would be happy with AC. As a matter of fact I have seen pitot tubes with 115 VAC heaters. Dan, U.S. Air Force, retired |
#7
|
|||
|
|||
rip
It might be possible? Use an inverter and diode rectifirer of the resulting A/C or just run on A/C. One of our retired electrical engineers could probably come op with a set of plans to build or how to modify a commercial Inverter (12DC/110VAC) you can buy anyplace. A basic question. How many homebuilts are IFR certified and are flown in icing conditions and need a heated pitot tube? Big John (I been lurking troops ) On Fri, 26 Mar 2004 23:57:43 GMT, rip wrote: No. A 28 volt pitot on a 14 volt system will only develop 1/4 of the design wattage. I feel your pain; the price of pitot tubes these days is absolutely, downright obscene. Rip B2431 wrote: Will running a 28 volt pitot tube heat on 12 volts heat it enough to use? I keep seeing 28 volt pitot tubes on e-bay and was wondering if they would do the job. Dan, U.S. Air Force, retired |
#8
|
|||
|
|||
On Sat, 27 Mar 2004 04:19:00 -0600, Big John
wrote: : :A basic question. How many homebuilts are IFR certified and are flown :in icing conditions and need a heated pitot tube? A significant number are IFR certified. None (or nearly none) are flown in *known* icing - it's when happens despite your best efforts that you don't want it to kill you. I don't think I'm going to put pitot heat on mine, despite a fully redundant Uuber IFR panel from the 6th circle of Hell (2 of everything except engine instruments). A while back I tried putting a post-it note over my airspeed indicator, and found I could land just fine. GPS gave me a general idea of airspeed, I knew what my approach looked like and how much power I was carrying. If the nose started to bob, I added a touch of power. I wouldn't do it in a conventional configuration but in a canard it worked surprisingly well. |
#9
|
|||
|
|||
|
#10
|
|||
|
|||
|
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Heat treating wing ribs | Holger Stephan | Home Built | 13 | February 3rd 04 11:59 PM |
Pitot and static couplings for a TTU-205 | B2431 | Home Built | 0 | August 15th 03 07:25 AM |
Pressure Differential in heat Exchangers | Bruce A. Frank | Home Built | 4 | July 3rd 03 05:18 AM |