Ulmann replies to W.O. Bentley

Browse pages
Current page

1

Current page

2

Current page

3

Current page

4

Current page

5

Current page

6

Current page

7

Current page

8

Current page

9

Current page

10

Current page

11

Current page

12

Current page

13

Current page

14

Current page

15

Current page

16

Current page

17

Current page

18

Current page

19

Current page

20

Current page

21

Current page

22

Current page

23

Current page

24

Current page

25

Current page

26

Current page

27

Current page

28

Current page

29

Current page

30

Current page

31

Current page

32

Current page

33

Current page

34

Current page

35

Current page

36

Current page

37

Current page

38

Current page

39

Current page

40

Current page

41

Current page

42

Current page

43

Current page

44

Current page

45

Current page

46

Current page

47

Current page

48

Current page

49

Current page

50

Current page

51

Current page

52

Current page

53

Current page

54

Current page

55

Current page

56

Current page

57

Current page

58

Current page

59

Current page

60

Current page

61

Current page

62

Current page

63

Current page

64

Current page

65

Current page

66

Current page

67

Current page

68

Current page

69

Current page

70

Current page

71

Current page

72

Current page

73

Current page

74

Current page

75

Current page

76

Current page

77

Current page

78

Current page

79

Current page

80

Current page

81

Current page

82

Current page

83

Current page

84

Current page

85

Current page

86

Current page

87

Current page

88

Current page

89

Current page

90

Current page

91

Current page

92

Current page

93

Current page

94

Current page

95

Current page

96

Current page

97

Current page

98

Current page

99

Current page

100

Current page

101

Current page

102

Current page

103

Current page

104

Current page

105

Current page

106

Current page

107

Current page

108

Current page

109

Current page

110

Current page

111

Current page

112

Current page

113

Current page

114

Current page

115

Current page

116

Current page

117

Current page

118

Current page

119

Current page

120

Current page

121

Current page

122

Current page

123

Sir,

Attached herewith, you will find my expression of apology to Mr. W. O. Bentley, which applies to my two (2) articles; one printed in 1964 and the other one of recent date, on which you commented in your January issue.

May I say that I enjoyed the “hand-off-attitude” of your remarks, for which I am very grateful.

I hold no brief against Mr. Bentley, and seeing the explanation he gave the editor of our magazine, dated February 8th, 1971, as most conclusive, I see no reason to pursue the subject. I hope he can give us more information, for historical purposes on the development work of the BR1 and BR 2 aircraft engine.

Regarding the “Airplane Engine Encyclopedia”, edited by Glenn D. Angle in 1921, Bentley is wrong in relegating this as merely a catalogue of aircraft engines. I am submitting herewith, a photostat of what he has to say about the Bentley and Clerget engines, which, I believe, is quite interesting.

Mr. Angle, who is no longer with us, was a most erudite authority on aircraft engines. His text book and collated information on aircraft engines, starting with the Abadal to Zeitlin (variable stroke rotary), a total of 525 pages of detailed information. (I have a complete story on the latter engine, in the event you are interested.)

Personally, I feel that this entire Bentley matter is a tempest in a tea pot and I am a bit surprised at his sensitivity. All I am trying to do is to give credit, where credit is due and if I am wrong, I am the first one to accept corrections, which, I believe in this case are legitimate.

I am puzzled with his claim that he was able to cast aluminium fins on to steel barrels. This has been tried many times, both on air cooled and water cooled engines and was abandoned because of the high expansion of the aluminium, as compared to steel, which created clearances and eventual seepage, destroying the heat transfer between the jacket and the barrel. This was the basic trouble with the Marmon Model 34 and the Hispano 6 Hb, until such time when they converted to wet sleeve engines.

As I have intimately been associated with the early development of aircraft engines, immediately after World War I, I shall be indebted to you if you can throw any light on the subject. I can not tell you how much I enjoy reading the vintage and veteran pieces in your magazine. Please keep up the good work.

Alec Ulmann, President.
New York, USA.