Page 2 - Combined_155_OCR

INTER COMPANY CORRESPONDENCE

October 9, 1909
i >i vr^i. >n
Special
\ chicle Development Engineering Of* ic< Highland Hark
i
I'IV ilO S
M Engineering Spa e ? Hunts vi He

t * nebile Hood ■coops am

During ■ i < \.n- i-o I , 10(59 Engineering Oar No 0-10, a race version ol
' Dodge ’ . cO, uilu i to Talladega Internationa I. Speedway for the purpose
h imp, data .-ju at urn o hoop and cowl scoops used for inducing carburetor inlet
his memo rep* '•(>. l ie resets from those tests.

'■■■ »iiDgur,( * «ted. i. first configuration uiitized the normal
'r source :.j • .‘ Hvl are.i co feed the carburetor while the second configuration
- T ( j. o’ix d. i -u d ||u:h hood scoop (called i M.A.C.A. itdeD to obtain carburetor
*1‘ •••■•<■ t\-o ' OiiE ; mis ar-, .sketched in Figure l.

' L od i n. ca i n ais I* c * < *gt; • a I ion I were1 made by the addition of several sized
ov r th* ; d cowl intake 9k wn in Figure 2 Chrec pressures were
ii Hi< i;» i> ■ tn a static pressure (l>s)> which was measured by
.* \ u . mirburetcr inlet wall , total pre ir (Pt), measured by
>be ’’a. urg directly Ini tie i.adm air flow at rhe carburetor inlet and on a plane in
: st op » obm and dynamic pressure (q). which was a physical summation ol

>re; ' ' (.1> |0 rr * ,;ai icd 'sseiitia lly ins ms it i /e to configural ion. change?
X
1 vnlll ’ i i nd i ngmo REM's

E j a l n< ■ REM

r.'zoo
th oo
tTqu
cood

•■sis the m i.*sj red v hie s of P., a. nd q at the various engine HEJV1. h . Significant
ms l ■: noiod 1 li bom. a nd q with no trends apparent . 'Chis phenomenon is
■. <* : d to <■■ vaviabj■• iurocth -etling bein 9-. required from one condition to the next to

g '■ •uit to the mt'uj -ri « x' i. immediately proceeding the carburetor intake removed
tl . ; ’ h-4 momm cd •Cu.m. i . er of this pressure and to some degree established trends
•e dm.a,