Engine basics > Four strokes only

OS .70 Surpass

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Dennis Toth:
Dan,
I got some information from a flyer in the UK that is using the Saito 56. He flew with the Berringer's, CHINESE, ITALIAN and others that and indicated that the 56 likes pitch (like a min of 7 or 8) as you indicated and like to fly a little fast (at ~5 sec/lap on full 70' lines). The variable load pitch was an attempt to have a twistable blade that would have a low pitch at the hub and high pitch at the tips, these props were made from laminated specific types of wood that allowed the blade to change pitch as the load comes off in corners (drag bucket effect) and allowed the prop to bit a bite more and pull the ship back to speed. Zinger had offered a similar prop called a dual pitch having a 6 pitch at the hub and a 10 at the tips. Seems iffy to me so I will work with a more standard approach.

For the Victory I have the long tail version, its tail moment is almost twice the short version. It's a big ship design for an Atwood 60 glow, flat out no 4-2-4. It has a short nose so balance should not be a problem. Several have built them with ST60's and yes ST46's. The ship likes to fly fast so seems a good fit for the Saito 56, big prop and long lines. After the holidays I will start working on the new ship.

Best,   DennisT

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