Hi! This was fun to look at. There are dozens of newspaper reports about the plane, but as far as I can see none mention William Clarke by name.
Here is the gist of the story:
http://timarit.is/view_page_init.jsp?is ... il%20FaberJuly 27th 1919
Cecil Faber is here - the pilot has arrived and the first chapter of Flugfélag Íslands begun. He arrived without a plane because she was left in Leith where they had forgotten to book a berth for her with the "'Island". Other than that he is ready for the first air show because he has with him a mechanic and he has been practicing.
Goes on to say that they met Faber onboard Ísland the previous night. Faber said he was used to being busy during the war and was not looking forward to waiting for the plane. Faber had been in the British airforce for 4 years, young, about twenty, small man. Had shot down 5 German planes and been injured twice but could always land his plane. He expected to be in Iceland 6 weeks, depending on if the plane arrived with "Gullfoss" or not. Said he thought Iceland probably needed boatplanes so they could land on the water rather than ground. Plane is Avro type, 110 hp Le Rhone motor. he bought it from British authorities for about halfprice, 700 pounds sterling. Absolutely new, never been flown. Hopes to take two passengers and have enough fuel for 3 hours. Doesn't want to talk about the war, says he is not going to be taking the post (as Danish papers have said) just to demonstrate flying.
http://timarit.is/view_page_init.jsp?is ... is&q=FaberAugust 1st
The plane will not come on Gullfoss, instead on Villemoes mid-month. Plane was too big for Gullfoss, no space.
http://timarit.is/view_page_init.jsp?is ... is&q=FaberAugust 30th
Plane builders and Faber are busy putting plane together in the hanger. The body is in one piece but the wings have been taken off and the steering wires all disconnected so a lot of work to do.
The motor is very interesting. All other motors in Iceland have fixed armature and rotating centre, and so are motors in many planes but this one rotates around the central line. (More technical stuff)
It will cost 2-3 kr to get watch from close-up, 25-30 kr to go up in plane. Most will want an "normal" flight but acrobatic ones are available for those who trust their stomachs.
http://timarit.is/view_page_init.jsp?is ... is&q=FaberSeptember 4th
The plane was seen in the air the previous day, for the first time. Expected to go up /:30 in the evening but was seen at after 5 when Faber was trying it for the first time. Took many rings and rolled over, then landed. Garðar Gíslason gave a speech, the plane took off again. More flights planned next evening.
http://timarit.is/view_page_init.jsp?is ... is&q=FaberSeptember 4
Longer description of the event the previous day. After the speech it says "Then Captain Faber sat at the helm and the mechanic turned the propeller. Soon the motor started and it was windy for those behind. After a short time the blocks were taken away from the wheels and the plane moved, first slowly then very fast over the field." Goes on to describe the flight, engine cutting and plane diving etc etc.
http://timarit.is/view_page_init.jsp?is ... is&q=Faber September 5th
Show should have started at 7:30 but was almost 8 when plane took off. "In the plane were Captain Faber and the British mechanic and they enjoyed themselves for a few minutes in the still evening." Faber flew low in the first flight, landed and took off alone, flying high and cutting the engine etc. In the third trip Ólafur Daviðsson (fishing ship owner) was passenger. Then next it was Garður Gíslason, head of Flugfélagið.
http://timarit.is/view_page_init.jsp?is ... il%20FaberSeptember 27th
Flying is over. English plane builders have been taking the plane to bits. Not known when it will fly again. Then a lot about Faber's career. Says he is Danish origins but born in England. Lived in Denmark for a while in the spring, and will go straight there to work for the newly formed Danish Airline. Will teach flying and supervise purchasing planes in Britain etc. "It was luck that Iceland got him to the country. Axel Tulinius, high court judge, and Consul P.A. Ólafsson, who are on board of Flugfélag, were in Denmark in the spring, looking for advice at the Danish Airline. Faber was able to help them and come. The plane arrived later, after Faber and his engineer Mr Kenyon, had arrived, because of too little space on ships arriving from England. Captain Faber has flown 146 short and longer flights ..." goes on the say where, how far etc.
http://timarit.is/view_page_init.jsp?is ... is&q=FaberOctober 1st
"Ísland" left last night with many passengers, including Captain Faber...
(Listed is also is N. P. Kirk a harbour engineer, he died in Copenhagen on October 18th so the Ísland must have arrived before then at least)
http://timarit.is/view_page_init.jsp?is ... er%20FaberOctober 14th
The plane has been taken to bits and returned to its crate, and will be stored over the winter. Captain Faber and his two mechanics left on Ísland.
I looked for "Kenyon" and he is mentioned a few times, once as Joe Kenyon.
http://timarit.is/view_page_init.jsp?is ... il%20FaberAugust 27th
Mr Kenyon, mechanic, who had a bad foot the other day is now up and about and almost fully fit. He is a specialist in the sort of plane engine which we have here. A second mechanic is expected with the "Villemoes". He is a specialist in building the plane body itself. It is important that not only the engine is alright, but also that the body is reliably constructed and that all steering apparatus is perfect."
It looks as though William Clarke could have been this second engineer. You might get lucky if you can track down the passenger list for either voyage.
If you go here
http://ljosmyndasafn.reykjavik.is/fotoweb/grid.fwx and search for MAÓ 978 , MAÓ 979 and MAÓ 980 there are 3 photos, one you have seen. One shows a guy swinging the prop, don't know which of the mechanics that might be - or neither perhaps. One of the papers said that the daughter of this photographer went up in the plane, and her father is suppsoed to have taken the first aerial photograph of Iceland so perhaps he went too.
Think that is all. Hope it helps.