Estevan SK - RAF - No. 38 Service Flying Training School - Anson II</titile> </head> <body> <BODY BGCOLOR="99CCFF" ALINK="#660000" VLINK="#990033" LINK="#660000"> <FONT COLOR="#660000"> <TABLE width="750"> <TR> <TD width="500"> <FONT COLOR="#660000"><center> <b><i>Origional Document</b></i><br> <A HREF="http://cap.estevan.sk.ca/SSR/history/38SFTS/pictures/ansondoc.JPG"><img src="http://cap.estevan.sk.ca//SSR/history/38SFTS/pictures/ansondocs.JPG"></a></P> <P ALIGN="RIGHT"> <TD width="3000"><FONT COLOR="#660000"> From:- Officer Commanding,<br> Servicing Squadron. <p> To:- Officers Commanding<br> A,B,C,D,E,F,G, & H Flights<br> Chief Flying Instructor.<br> Officer Commanding, Repair Squadron <p> Date:- Sept.3rd.1943. <p> <u>ANSON II AIRCRAFT WITH HOOVER CONTROLLABLE SPEED PROPELLORS</u> <p> 1. All the particulars required for the operation of Anson 11 aircraft fitted with Hoover Controllable Speed propellers are available in Pilots Notes, C.A.P.218, Vol.2. The general information given below, which can be found in this publication, has however, been selected for the use of Flight Commanders and Instructors for ease of reference.<br> (a) For ground running in 'fine pitch', Jacobs engines with the Hoover propeller should develop 2000 rpm; - 2200 rpm. on take off, with a maximum of 2300 rpm.<br> (b) After the initial climb, when the throttles are closed from the 'full open' position, the propeller should be selected into 'coarse' (C.A.P.218.Vol.2.page 19 para.9 (d)<br> (c) On preliminary approach for landing, the propellers should be selected 'fully fine' (C.A.P.218.Vol.2.Page 19 para.22 (d))<br> (d) For single engine flying the propeller of the failed engine must be placed in the 'coarse' position, and the propeller of the operating engine is to be 'fully fine'. (C.A.P.218.Vol.2.page 22 para. (d) (ii).<br> <p> <align="left"> </TD> </TR> </TABLE> 2. The following paragraphs of the C.A.P.218.vol2.are also brought to the notice of Flight Commanders and Instructors, when flying in aircraft fitted with the subject propellers. <p> Page 20. (subsequent actions, V.)<br> Page 21. Para.11. 30 minutes limitations.<br> Page 28. Para.28. Notes on Jacob Engines.<br> <p> 3. It is not proposed to give a detailed explanation of the operation of the propellers, but the following information may be instructive and of interest. <p> The 'coarse' position of the Hoover propeller is brought into effect with the use of high pressure oil controlled by the booster pump installed at the rear of the engine. The 'fine' position is brought about and maintained by normal engine oil pressure. It should be noted here that the boosted pressure (coarse) is always operating against the normal engine pressure. Therefore, should the boost pressure fail, the pitch will return to the 'fine' position. The converse does not apply, i.e. should the main engine pump fail, the supply to the booster pump also fails, usually leaving just sufficient oil in the pipe lines to operate the propeller into the 'fine' position. <p> On aircraft fitted on this Unit, th 'up' position of the selector lever is 'coarse' and the 'down' position 'fine'. The changing to and from the 'coarse' and 'fine' position must be carried out at 1500 rpm. or more, otherwise the booster pump cannot overcome normal oil pressure - this is most important, especially on the approach prior to landing. <p> <br><br><br><br><br><br> (R.E. Thraves) P/O<br> Officer Commanding,<br> <u>Servicing Squadron</u> <p> </body> </html>