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Engine basics => Engine set up tips => Topic started by: Steve Helmick on October 20, 2007, 04:46:42 PM
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Lately, I've been exposed more to both types of Magnum .36's, XL and XLS. Jeff Rein has an old 80mph combat XL in his ARF Smoothie. Running an 11-4 APC, it was pretty impressive, as is Jeff's flying. Mike Haverly and I got Jeff to try a 10.5 x 4.5 APC, hoping that it would work better, but not sure. It did; Jeff was happy.
In August, at the Prairie Fire event in Edmonton, AB, Monty Summach said that he was going to sell his Brodak Olympic, which I'd seen Monty fly the previous year. As I'd judged Classic and Expert, I got to watch it carefully, and it worked very well. I ended up taking it home, minus engine, Magnum XLS .36 powered. But I was smart enough to ask what prop, venturi, line length, etc. ProZinger 11-4. Reworked? Not much, says Monty.
At the RF Stevenson Memorial Raider Roundup, Mike Haverly plonked down his newish Profile Stunt entry with a "For Sale" sign, saying that he was too busy flying Classic and Advanced, to fly Profile. He walked away, I put it in the back of my truck. Later wrote him a check. XLS .36 powered, this time included with the deal. But the CF prop he used wasn't. We took it up to Arlington a few weeks later, and the prop question came up. Well, it went too fast with the 10.5 x 4.5 APC, he said. But maybe the 11 x 4.5 Cyclone prop would work? On went the Cyclone, and it was wonderful! Launched at 10.2k, got a 5.1 sec. laptime, and gave these old reflexes a chance. This is also Mike's prop of choice for his Brodak .40 powered JD Falcon, OBTW.
So, there you have three different, affordable props to try that are known to work well on the Magnum (or ASP) .36's. One thing to watch for on the Magnum's is fuel economy. If fuel econ. suddenly goes very high, and the engine constantly just runs away, put in some good bearings, not OEM stuff. Call Boca Bearing. D>K Steve