stunthanger.com
Speed,Combat,Scale,Racing => Combat => Topic started by: phil c on March 22, 2007, 06:23:11 PM
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Come and join the fun.
We're planning to have a supply of ready-to-fly planes on hand, just bolt up an engine and go. The new Brodak 25 works pretty well on 25% nitro. Spend a couple afternoons tuning the speed and fly on Friday.
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Man! If only I weren't 3500 miles away!!
Hag
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Phil,
Please enhance the published rules.
Is it .018" for all engines, or do the smaller engines get to use .015" ?
I've seen "speed limit" both ways.
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We(meaning me as a CD) always do things by the book, with any changes announced. Per AMA rules, 15's can fly on .015 lines. If you are going to do it, I would strongly suggest doing some test flying and adding some nose weight. Longer lines make the plane less stable, and the 15/F2D ships are usually very marginally stable enough as it is.
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Man! If only I weren't 3500 miles away!!
Hag
You can fly into Toronto June 8 and take in the T&D, another great contest & right across the street from the airport. Carmichaels is just nice day's drive away. You could average your per-contest mileage down to half.
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Hag, where are you? Alaska or Hawaii?
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Come and join the fun.
We're planning to have a supply of ready-to-fly planes on hand, just bolt up an engine and go. The new Brodak 25 works pretty well on 25% nitro. Spend a couple afternoons tuning the speed and fly on Friday.
Phil,
How much for the RTF combat planes?
And will an OS .15 work?
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You need to go about 64 MPH with a streamer or 70 without, on 60-foot lines.
If you go too fast, you lose. If you go too slow, you lose.
If you you just put something together without testing, it will probably be too fast or slow.
Phil ( and most other flyers) have settled on the 25 as the correct engine. It takes a strong 15 to do the job. A choked down 36 will work, but with a weight penalty.
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Any thoughts on using a Fox 35?..I used to have one on a Voodoo and it flew well
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Weeeellllll,,,
I flew three planes this morning,,, an LA 25, Fox 35 Stunt, and Brodak 40.
All three did well, but none were in the speed range. It takes some tweeking-in.
If done right, I can get one plane eligible for Foxberg, Combat-70, Profile Stunt, anf CLPA. I'll need 012, 015, and 018 lines, as well as three fuel tanks, but can be done, we have the technology.
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A Fox 35 on a 9/6 prop should be just about perfect, speed wise. They are tough to run though. Tend to be hard starting, hard to set, subject to overlean runs, and run hot.
The key for any engine in SL is to make or buy a variable venturi. Just simple cross ways nylon bolt that you can screw in and out to adjust the air flow is all that is needed. Look for ~16,500 rpm on an 8/4 APC, if you run a 25.
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Come and join the fun.
We're planning to have a supply of ready-to-fly planes on hand, just bolt up an engine and go. The new Brodak 25 works pretty well on 25% nitro. Spend a couple afternoons tuning the speed and fly on Friday.
Hi Phil,
I suppose that you mean, "just (BUY), bolt up an engine and go." ??? ??? ???
How much? ;D S?P
Bill <><
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You need to go about 64 MPH with a streamer or 70 without, on 60-foot lines.
If you go too fast, you lose. If you go too slow, you lose.
If you you just put something together without testing, it will probably be too fast or slow.
Phil ( and most other flyers) have settled on the 25 as the correct engine. It takes a strong 15 to do the job. A choked down 36 will work, but with a weight penalty.
Unless somethings changed I believe at Brodak's it's 72mph with the streamer.
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Unless somethings changed I believe at Brodak's it's 72mph with the streamer.
Precisely, Mr. Spock,
70.45 and 64.29
Live long and prosper.
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Keep in mind that the speed limit is there to keep the planes in a fairly narrow performance range. The judge looks to see if the planes appear to be evenly matched, speedwise. If they are he likely won't even time them. If one does appear notably fast on the first launch he'll time it. It is extremely rare for somebody to be so far off that they run sub 7.3 with a full streamer, but if they are in the sub 8 sec range he'll let them go and keep an eye on things. If at some point the plane loses its whole streamer it likely will get timed again, before the pilot has a chance to get three quick cuts with a huge speed advantage.
With bladders you often see the speeds vary quite a bit during a match. It rarely makes any difference to the outcome.
And remember, the penalty is not "you lose". Your airtime watch and cut scoring just stop until you land and fix the problem. This is actually more of a disadvantage to your opponent. We've had plenty of instances where the slower guy will just signal the judge to let the match go ahead. He'd rather have a shot at scoring some points, even if he is a bit slow, than motor around for five minutes and get a minimum score.