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Pete, Bob is incorrect in his assessment of venturies. They are certified for IFR flight! Were used all the time before vacuum pumps came along. 47HG(1947 IFR Certified 415-D) has one venturi called a Super Venturi available from Spruce or Wag Aero that will power two gyro's ( Artificial Horizon and DG. in my case) My turn and bank is electric as are most now days. BTW Spruce has a diagram of how to connect the vacuum system in their catalog. The AH and DG usually will not spin up until after take off ! Not enough vacuum being created. Let me know if I can help you. Hank Gallagher N47HG 1947 415-D On Loan N866RV RV-6 90 Hr. Both IFR Certified! ----- Original Message ----- From: Rparker <mailto:[EMAIL PROTECTED]> To: Pete <mailto:[EMAIL PROTECTED]> Thomson ; 'Coupe general' <mailto:[email protected]> Sent: Wednesday, August 07, 2002 12:16 AM Subject: Re: [COUPERS-FLYIN] Venturi ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- _____ Pete, You did not mention if you had a Turn & Bank. I am getting you a drawing together for the way to connect the system up. Will finish it tomorrow. One venturi will NOT run both indicators. I will have some things for you to check on the precessing at 85 MPH. Venturis are definitely not qualified for intentional IFR flight.The whole system will be explained. Bob Parker Mena, AR. ----- Original Message ----- From: Pete <mailto:[EMAIL PROTECTED]> Thomson To: 'Coupe <mailto:[email protected]> general' Sent: Tuesday, August 06, 2002 12:50 PM Subject: [COUPERS-FLYIN] Venturi ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- Good morning all, I just completed a total restoration of 3828H and this included a new AH and DG. The venturies I have are about 10 inches long so I used 3/8 ID suction hose to them. There are two venturies, on for the DG and one for the AH. I was told it would be best to use the larger internal diameter hose so I did, I was unable to find new hose with the large ID so I used to old one. The new 3/8 hose I received had a 1/4 inch ID so I did not use it. Below 85 MPH I cannot get the Attitude indicator to behave, is this normal? Have any of you had this problem and changed venturies or put in an electric vaccum pump? I received a letter form the Federalies informing me that in order to be IFR I needed to have an electrical backup pump installed. Any ideas on all of the above would be appreciated I also had a fluctuating oil pressure of around 5 PSI ( 30 to 35 ) two flights ago and found my oil to be at 3 quarts when I landed. It was a 4 hour flight so I used a quart. After putting in the other quart, the problem seems to have gone away and I am at a steady 35 PSI. Have any of you had eratic indications when the oil is down to 3 quarts, I did not last year, but it never got this hot last year ( around 80 ). Do I have to split the case to get to the pressure relief valve? the hose from ( to ) the gauge goes directly into the crankcase right in front of the right magnetoe. I have a C85. Thanks,Pete Pete :-):-):-):-):-) Have a great day!!! ====================== TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm _____ ================================================================== TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm ====================== TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm
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