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Speed,Combat,Scale,Racing => Speed Talk => Topic started by: C.T. Schaefer on June 15, 2016, 07:40:57 PM
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The dust has settled on the Brodak speed field. Today was the 'official' speed day but Paul encouraged entrants to fly on Monday and Tuesday as well. We (The Middlesex Wrecking Crew) took advantage of the opportunity and flew the Fox planes on Monday and, both classes on Tues. Weather was good all 3 days. I'm sure there will be a full report of all contestants before long but this will cover the top spots.
Fox .35 Speed 1. C.T. Schaefer 107.4
2. Al Ferraro 105.4
3. Jim Vigani 100.27
4. H. Nelson 100.2
Perky Speed 1. R. Whitney 114.1
2. Al Ferraro 112.3
3. H. Nelson 109.17
4. C.T. Schaefer 104.6
5. Dave Hallas 99.3
So. Those are the facts. Another fact is that the 17 year cicadas are here and when there is a plane in the air they seem to be attracted to the sound and then swarm around the circle and the pilots literally wear them while trying to concentrate on keeping their screaming craft in the air let alone in the groove! It definitely put an extra fun factor on the festivities!!
There were a number of FOX Fatalities. A couple of collapsed pistons and a free flying crank/spinner assembly which, fortunately, did not hit any soft targets. We saw a nice rear intake version that needs a bit more R/D. The three top scores were posted by the Middlesex Wrecking Crew. We spent a lot of time test flying. In other words we ran the crap out of them and suffered no mechanical problems. In order to lend encouragement to other speed seekers out there, the engine in the winner was built with a blend of ALL Fox .35 parts. No custom machining or low production parts and........ it is still .35 ci.
Perky was also quite a hard working but fun event. Hats off to Bob Whitney for keeping his eye on the prize for a number of years and, today, at last, raising the Perky bar to a new level. Al's plane put in his top number on the last attempt of the day. He feels that there is still a bit left in there but we just ran out of time. Next year? Henry put up what seemed to be two methodical attempts for his solid performance. While not as fast as the top guys, my perky performed well but just would not rise any higher. Despite that I felt pretty good about the performance of my almost 45 year old Goodyear motor that has been sitting in a box for 30 years. Is there more in there? Tune in next year. More details may come along but I am tired now. Hope this is of interest. TS
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Thanks for the nice report, you did good, and you did good on the report.
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Way to go guys. Just goes to show that practice and experience does the job. H^^
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Did anybody get some pictures of the models? Henry was a little bit slower than he ran here in St Louis
Fred
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Tom,
It was a pleasure to meet you and Al. That 107 sounded really stout. It was cool!
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well that concludes putting the fun back into speed. Good job to all.
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What engine did Bob use in Perky?
MM
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Open the attached Excel Spreadsheet for ALL Brodak Speed scores.
It works OK. See the control box in the lower left corner and click it.
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Will t down load for this old man. ???
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Did anybody get some pictures of the models? Henry was a little bit slower than he ran here in St Louis
Fred
Here's the top 3 in Fox Speed. Right to left: Al Ferraro - 2nd, Tom Schaefer - 1st, Jim Vigani - 3rd. All Middlesex members.
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Did anybody get some pictures of the models? Henry was a little bit slower than he ran here in St Louis
Fred
Brodak has an altitude over 1000 feet, so speeds should be slower than most other places.
Al
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Try flying in Death Valley.
While "high" altitude can reduce HP, it also reduces drag. You can recover HP with reduced head clearance, but the drag is still reduced. So maybe a little higher is BETTER.
Detroit is 593 feet, Brodak 1047, Dresden, Muncie and Dayton are in between. The barometer fluctuates more than that on a normal day, not enough to worry about. Unless you're doing a an instrument landing in foul weather.
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Naturally aspirated engines lose about 3.5% of their power per 1000 feet of elevation. If you watched NHRA drag racing you will see that the Pro Stock cars and bikes ET a lot slower at the higher elevation tracks. The Top fuel guys will spin the blower faster to make up for thinner air so the higher elevation does not hurt their ET. I don't think the reduced drag plays into a quicker ET or else the Top Fuel and Funny Car guys would be running lower ET at the high elevation tracks, so I would say Higher is NOT better.
Al
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OK, Muncie is 500 feet lower than Carmichaels. Maybe the speeds will be faster. But I doubt it. This is in the indifferent range.
Run a contest at 6,000 feet or 11,000 feet and you will have an issue.
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They go slower with allot of bugs hitting the lines.
MM
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I forgot one important item about the Brodak. A big thanks to Paul Smith who picked up the ball and ran three speed classes this year! In addition, he flys many events throughout the week. Way more energy than I could muster! So, thanks again for gittin' her done. TS
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my perky had a Nelson R EX and Mini pipe with a stock APC 6.5/5
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my perky had a Nelson R EX and Mini pipe with a stock APC 6.5/5
Congratulations my friend! Congratulations!!
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my perky had a Nelson R EX and Mini pipe with a stock APC 6.5/5
Bobby, I think I have a mold for that prop.
MM
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I do also
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Was that Nelson a 12mm shaft with the high timed diesel sleeve or one of the new ones?
Thanks,
MM
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it has a screw in backplate , and a modified -modified Dick lambert piston and liner, dont know the crank OD
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Dare I ask venturi size and configuration? I have allot of racing 15's which are basically useless right now. A Perky might put them back to action. Can we use composite props?
Thanks,
MM
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.260 with a Pee Tube any prop
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I found some perky plans but what is the wing span so I can make sure they are full size. What is the line size? Trying to talk the wife into flying it but she's worried about torque roll. Is 1/2oz tip weight enough?
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It's an 18" wingspan. With the tapered wingtips the mass of the tip weight is only about 8" outboard. So use plenty and reduce it if you can. Torquing-in is a real issue.