Austro-Daimler engines - H-B CC

[Rowan Broadbent]

The engine fitted to the H-B CC Flyingboat seems to have the overhead cam vertical drive in the center (between the two triplets of cylinders) as opposed to the front on other A-D engines I have seen. Does this denote a different engine or was it a specific modification for the CC installation?

There seem to have been different hp outputs for these engines, but with little external difference - 150 up to 225 (I think). Is this a fair assumption?

TIA
Rowan

[Oblt Lukasch]

Hi Rowan,

I'm afraid I can not fully agree with your assumptions.

Apart from the V 12 and some odd Designs ( 9 - Cylinder W ... ) which never found their way into Production all Inline AD Aeroengines are derived from 2 basic layouts.

1.) the pushrod engines:
AD startet the aeroengine business with a 4 Cyl ( 40 and 65 HP ) derived from the Prinz Heinrich - sportscar Engine. The 6 Cyl Types ( between 90 and 150 HP ) where developments from this "little" ( 6.5 Litre capacity or so ... ) four-banger. All mentioned designs incorporated push-pull rod operated valves

--> http://airmuseum.webpark.sk/images/m...ro_daimler.jpg


2.) the ohc - types:
In 1915/1916 a wholly new design with a bevel driven overhead camshaft
was introduced. The cam drive was mounted in front of the cylinder barrel.

This series started with 160 HP followed by a higher revving 185 HP version. Both engine types had 2 valves per cylinder.
Later versions ( >= 200 HP ) had a 4-valve head.

--> http://worldatwar.net/chandelle/v2/v...trodaimler.gif
--> http://www.wwi-models.org/Photos/Eng...ler_left_1.jpg

Liebe Grüße

Peter

[Rowan Broadbent]

Originally Posted by Oblt Lukasch

2.) the ohc - types:
Ind 1915/1916 a wholly new design with a bevel driven overhead camshaft
was introduced. The cam drive was mounted in front of the cylinder barrel.

This series started with 160 HP followed by a higher revving 185 HP version. Both engine types had 2 valves per cylinder.
Later versions ( >= 200 HP ) had a 4-valve head.

--> http://worldatwar.net/chandelle/v2/v...trodaimler.gif
--> http://www.wwi-models.org/Photos/Eng...ler_left_1.jpg

Liebe Grüße

Peter

It was the ohc engines I was refering to. Seems that the only difference, externally, was the number of valves/cylinder, thanks. But I still have the problem with the central bevel cam drive on the CC's engine.

Rowan

[GrzeM]

Hi!
You probably mean Hiero 200hp engine, which was used on most Brandenburgs CC. Only about 3 or 4 of the CC planes were equipped with the Daimlers.

Hiero engine on the Phonix D.III in Sweden:



Cheers!
G.

[Ransom E. Olds]

A point of recognition of Hiero engines compared with other Central Powers OHC inline sixes is that the intake side was on the right and the exhaust on the left. Ransom

[Rowan Broadbent]

Originally Posted by GrzeM

Hi!
You probably mean Hiero 200hp engine, which was used on most Brandenburgs CC. Only about 3 or 4 of the CC planes were equipped with the Daimlers.
G.

Ah! Thank you. Silly me, I was assuming (that word again!) that it was an Austro Daimler.

Rowan