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Engine basics => Engine set up tips => Topic started by: bruce malm on December 19, 2006, 05:42:56 PM
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Just wondering if anybody has compared the power of the Tom Dixon tuned Fox 35 with stuffer backplate and Fox hemi head to the standard Double Star 40
I know Tom reports his reworked Fox pulls like a 40. I have a plane set up for the DS but not sure if I should spend the $$$ on a DS. I also have one of Larry Foster's reworks with the other hemi head and stuffer backplate.
Any information would be appreciated.
Merry Christmas and Happy New Year to all.
Bruce
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I love my DS .60bb. j1 I've also run and flown one of the two DS .40's I have. HB~> It's smooth, it starts well, but I can't think of anything it would fly well, other than maybe a Veco Warrior or Bi-Slob, and they would have to be kept light. There's no reason a $150 engine should need any rework, and it definitely does. I'd suggest you use your Foster or Dixon Fox. Steve
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I can't compare the Tom's Fox 35 to the stock DS 40. But, I can caompare a L&J Fox 35 with all the mods to a Stock DS 40. I believe the L&J is a *little* stronger.
All bets are off if you install a larger restrictor (venturi) of around .300 and a couple extra head shims with 10% nitro in the DS 40. Then it is a pretty good pulling 40. Stock, th eDS 40s I have had less choke area than a stock Fox 35!
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Bruce,
What sort of plane is it, and how heavy is it?
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I bought the prototype of Windy's Cardinal Revolution that Elliot Scott had on E-bay. Beautifully built and very light. I 'm not sure when I will start finishing. It was built around the DS 40 and I understand the Fox and the DS are interchangeable as far as size. I have not really had time to actually check. I will probably add a couple more coats of clear and finish with automotive paint. Probably white for the base color. I could put another 40 or larger engine in it, but I hate to mess up the beautiful workmanship already put into the airplane, but it might come to that.
Bruce
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Cardinal Evolution or Revolution? I'm not familiar with a revolution version. I'm guessing a revolution Cardinal would be smaller than the 40 size Evolution and built around a Fox 35......?
Perchance do you have data on square inches, etc?
Fox and DS should interchange, although check for subtle differences in length from mounting holes to prop washer.
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You are correct it is the Evolution. Just had a brain f**t.
And at this time, I haven't calculated the wing area, etc.
Bruce
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If my memory is accurate, the Evolution is roughly the wing of the Profile cardinal. That *should* work if the airplane is light, but its outside the scope of my experience with the DS 40. I have my 40 DS in a Nobler. I'm not sure a DS 40 gives me a warm fuzzy feeling in something like the evolution, but I have no data to back up my feelings. Hopefully, somebody else has more revelant experience with shps that size.
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Windy put the DS .40 in his Profile Cardinal prototype after the K&B .40S. The report that the line tension was not much. For comparison, I tried one of the K&B .40s (#4055) ABC with as much as a .312" venturi, and it just didn't put out enough power. I'd suggest a B.40, TT or Magnum .36 or .46LA. Easier to do now, than later. The Foxes won't make it, either, in that plane, but especially with your local heat. n1 Steve
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I pulled it down and the wing area is 585 and it is very light. The L&j Fox I have on a Nobler really pulls well. The fox would need an 1/8" spacer behind the spinner to clear the nose. The B-40 would need a little mount modification and a custom spinner backplate to close the gap.
I have a profile Cardinal and they look pretty close. I'll have to do some testing when I can. I hope the grass on my field grows in so I can fly in the evening and not have to plan to drive all over town. I have quite a few other engines I can see if they fit. I also have 2 new 46VF's and a bunch more used ones on R/C planes and a couple 40VF's. So when I really get ready to finish it, I'll make the decision.
I've been busy building Quarter scale Gee Bees that a friend sells to restaurants etc. I just finished the 10 th one, 7 in the last 2 month's but still have a J3. Just need to get back to my own airplanes that are 1/2 finished.
Thank you to everybody for all your input and Hope everybody has a Fabulous, Merry and safe Christmas.
Bruce / Wackydaddy