Pitts S1-S by EMHW
09-07-2015, 05:21 PM
#5401
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It would not load on my 3.5, hence the new 7.5...
Anthony, edit the ailerons to 30° and the ele to 18°. That will make it pretty much identical to how mine flies, both low rates and high.
By the way, try dipping the tail in the water at Alpine lake and landing on the hillside. What a hoot!
Anthony, edit the ailerons to 30° and the ele to 18°. That will make it pretty much identical to how mine flies, both low rates and high.
By the way, try dipping the tail in the water at Alpine lake and landing on the hillside. What a hoot!
Last edited by acerc; 09-07-2015 at 05:25 PM.
09-07-2015, 07:14 PM
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10-17-2015, 05:14 PM
#5406
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12 O'clock high has come and gone, it was another great event put on by Frank Tiano. I only managed to get three flight's in but had a heck of a time, met some new great people, and watched a lot of folk's drool over the Eagle. It definitely need's a wash and polish after this weekend. One of the Pitt's brothers also stopped by, modracer07 (aka) Chris and pictured below, I think he liked it. I had planned on more flight's but after the first one this morning I went to swap the two blade for the three and found that it had two prop bolt's broke. But that did and does not take away the pure pleasure of the three flights I did get or the time spent this weekend enjoying this hobby and the many fantastic people in it.
The is a video of this morning's flight as soon as videographer, (aka) a good friend, has it loaded and pulls some still shots for me I will post them/it.
The is a video of this morning's flight as soon as videographer, (aka) a good friend, has it loaded and pulls some still shots for me I will post them/it.
10-17-2015, 09:34 PM
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12 O'clock high has come and gone, it was another great event put on by Frank Tiano. I only managed to get three flight's in but had a heck of a time, met some new great people, and watched a lot of folk's drool over the Eagle. It definitely need's a wash and polish after this weekend. One of the Pitt's brothers also stopped by, modracer07 (aka) Chris and pictured below, I think he liked it. I had planned on more flight's but after the first one this morning I went to swap the two blade for the three and found that it had two prop bolt's broke. But that did and does not take away the pure pleasure of the three flights I did get or the time spent this weekend enjoying this hobby and the many fantastic people in it.
The is a video of this morning's flight as soon as videographer, (aka) a good friend, has it loaded and pulls some still shots for me I will post them/it.
The is a video of this morning's flight as soon as videographer, (aka) a good friend, has it loaded and pulls some still shots for me I will post them/it.
10-18-2015, 02:24 PM
#5409
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Here is the video of the first flight of the third day, nothing fancy, going to take it a bit easy with it until I feel confident it can handle the extra weight.
The extremely annoying noise in the background is twin waiting his turn to go up, you'll hear it when he does.
https://www.youtube.com/watch?v=hui0rhSa7w8
The extremely annoying noise in the background is twin waiting his turn to go up, you'll hear it when he does.
https://www.youtube.com/watch?v=hui0rhSa7w8
10-18-2015, 03:36 PM
#5412
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Thanks guys. There are no coupling or mixes, it's all me. I have been taking it easy out of caution of the excess weight. But after this weekend I feel like there is no issue, it is a floater more or less. With the weight shift it touches down lightly which is a far cry from the previous thuds one could hear. The plan is to get it out to the field next Saturday and start a bit of wringing it out. I ordered new and better prop bolts today, should be here in two days. And I went and picked up the other few things I need to get it back right. Next time it should be running great, have the three blade, smoke working better, and the smoke working better. Also the wife is wanting to flex her muscle's a bit with her new video camera.
10-18-2015, 07:32 PM
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Thanks guys. There are no coupling or mixes, it's all me. I have been taking it easy out of caution of the excess weight. But after this weekend I feel like there is no issue, it is a floater more or less. With the weight shift it touches down lightly which is a far cry from the previous thuds one could hear. The plan is to get it out to the field next Saturday and start a bit of wringing it out. I ordered new and better prop bolts today, should be here in two days. And I went and picked up the other few things I need to get it back right. Next time it should be running great, have the three blade, smoke working better, and the smoke working better. Also the wife is wanting to flex her muscle's a bit with her new video camera.
I hope....
10-19-2015, 08:00 AM
#5414
Whats the total wing area of your 46% Pitts Ace?
The full sized Pitts has a total wing area of 125 square feet, that is 18000 square inches... multiply that by 46%, you get 57.5 square feet, or 8280 square inches... at 50 pounds gross weight, I get 13.9 oz./ sq ft wing loading... that is like a feather compared to my 1/4 scale super cub, which has a wing loading of 29.6 oz / sq ft... I do recall you mentioned your total wing area was less than 8280, but I forgot, too lazy to go looking, but even if it were 6280 square inches, that's still only 18.3 oz / sq ft.... at 60 pounds you would have a wing loading of 22 oz / sq ft @ 6280 square inches wing area, still very light wing loading.
John M,
The full sized Pitts has a total wing area of 125 square feet, that is 18000 square inches... multiply that by 46%, you get 57.5 square feet, or 8280 square inches... at 50 pounds gross weight, I get 13.9 oz./ sq ft wing loading... that is like a feather compared to my 1/4 scale super cub, which has a wing loading of 29.6 oz / sq ft... I do recall you mentioned your total wing area was less than 8280, but I forgot, too lazy to go looking, but even if it were 6280 square inches, that's still only 18.3 oz / sq ft.... at 60 pounds you would have a wing loading of 22 oz / sq ft @ 6280 square inches wing area, still very light wing loading.
John M,
10-19-2015, 09:18 AM
#5415
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According to my set of full scale S1-S plans the wing area is 98.47, ailerons 10.21, for a total wing area is 108.68 sqft, my Pitts weighs 49lbs 12.8oz.
Last edited by acerc; 10-20-2015 at 02:52 PM.
10-19-2015, 07:50 PM
#5417
BTW, the full scale Pitts S1-S Wikipedia site says it has a 20 ft (240") wing span, and 125 sq ft wing area... aero-web site show it having 17.4 ft wing span, and 98.5 sq ft wing area... maybe there was a clip version, or the person that posted the spec's on wiki got it wrong... either way it would be safe to say your ol girl is hefty enough to take it at the wing loading she has.
John M,
10-20-2015, 04:02 AM
#5418
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Sounds about right, it does not feel heavy on the sticks. I can't help what Wiki says, like I said I have a full set of Aviat S1-S plans. The plans are what I used for reference on the build.
You have to keep in mind Wiki is a volunteer shared info site. Also one has to remember the Pitts is a custom aircraft and every one whom order's one or build's one has many variations to choose from on the wing's and ailerons. These options change the wing length's, one can also make change's to the length just to make it more or less aerobatic.
You have to keep in mind Wiki is a volunteer shared info site. Also one has to remember the Pitts is a custom aircraft and every one whom order's one or build's one has many variations to choose from on the wing's and ailerons. These options change the wing length's, one can also make change's to the length just to make it more or less aerobatic.
Last edited by acerc; 10-20-2015 at 04:42 AM.
10-20-2015, 08:51 AM
#5419
Yes wiki is known to be off at times.
Your Pitts is just about a pound per square foot wing loading... to show just how light that is... one pound per square foot equals, 0.111of an once per square inch. Hehe, that's nothing
John M,
Your Pitts is just about a pound per square foot wing loading... to show just how light that is... one pound per square foot equals, 0.111of an once per square inch. Hehe, that's nothing
John M,
10-20-2015, 12:03 PM
#5420
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I have ran the numbers and came to the same conclusion, it is light in the sadle. I even went comparing it to a bunch of ARF's listed weight's. My point on "taking it easy because of the weight" is because EMHW list a weight of 33+lbs. I don't know if their + is up to 49lb 12.8oz, that is as stated earlier 16lb 12.8oz over 33lbs. After each flight I check thing's like the flying wire's for signs of overload stress and after six flight's have seen nothing. So from here on out it will be a "Fly it like I stole it" kind of Pitts, unless something in her tells me otherwise.
10-20-2015, 01:12 PM
#5421
Hey Robert
All this wing loading discussion has got my curiosity up ....... just what is the wingspan and wing chord of your model? You've already listed the weight at 49 pounds 12.8 ounces.
It does appear to fly light on the wing and certainly looks good in the air.
Your color scheme has been growing on me. I wasn't a fan at first but the more I see it in the air the better it looks - very striking!
Cheers,
Art
All this wing loading discussion has got my curiosity up ....... just what is the wingspan and wing chord of your model? You've already listed the weight at 49 pounds 12.8 ounces.
It does appear to fly light on the wing and certainly looks good in the air.
Your color scheme has been growing on me. I wasn't a fan at first but the more I see it in the air the better it looks - very striking!
Cheers,
Art
10-20-2015, 02:20 PM
#5422
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Top wing 95.6", Bottom wing 92.7", Wing chord 15".
Oh yeeaaa, I remember at the beginning how little fan fare there was towards this scheme. I believe most comments were something like "It's not a Pitts like that", most thought it had to be a sun burst red and white. But fortunately for me, I don't like to follow or blend in with the crowd.
Oh yeeaaa, I remember at the beginning how little fan fare there was towards this scheme. I believe most comments were something like "It's not a Pitts like that", most thought it had to be a sun burst red and white. But fortunately for me, I don't like to follow or blend in with the crowd.
10-20-2015, 02:25 PM
#5423
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Back when I was searching for a scheme for the scratch Sheber Pitts, I saw this scheme. I instantly knew I was going to do this scheme and that it was going to have to be on a much bigger frame than the Sheber. So I researched the Eagle, ordered the EMHW, and then a month later the same scenario happened with the Valach. And here I am, with a gorgeous airframe and a fantastic engine, life don't get no better!!!
10-20-2015, 02:27 PM
#5424
I have ran the numbers and came to the same conclusion, it is light in the sadle. I even went comparing it to a bunch of ARF's listed weight's. My point on "taking it easy because of the weight" is because EMHW list a weight of 33+lbs. I don't know if their + is up to 49lb 12.8oz, that is as stated earlier 16lb 12.8oz over 33lbs. After each flight I check thing's like the flying wire's for signs of overload stress and after six flight's have seen nothing. So from here on out it will be a "Fly it like I stole it" kind of Pitts, unless something in her tells me otherwise.
Did you email them to get their opinion on the weight?... the larger version on Toni's site (in the videos)... it has the same engine as yours, it weighs a few pounds more than yours, and probably has the same construction methods used and they're throwing that thing around the sky like it weighs nothing.
I don't blame you for taking it easy, a lot time and money went into it, you're handling it the right way... making the top wing one piece, strengthened it considerably, not to mention the little extra beefing you did as you were building... she is flying very nice in that last video, nice clean rolls, and the take off and climb out was very nice... the sound of that Valach 170cc engine, you have no idea how badly I would luv to put one of those in something.
John M,
10-20-2015, 02:47 PM
#5425
Top wing 95.6", Bottom wing 92.7", Wing chord 15".
Oh yeeaaa, I remember at the beginning how little fan fare there was towards this scheme. I believe most comments were something like "It's not a Pitts like that", most thought it had to be a sun burst red and white. But fortunately for me, I don't like to follow or blend in with the crowd.
Oh yeeaaa, I remember at the beginning how little fan fare there was towards this scheme. I believe most comments were something like "It's not a Pitts like that", most thought it had to be a sun burst red and white. But fortunately for me, I don't like to follow or blend in with the crowd.
That is considerably less wing area base off the full scale figure of 108.68 sq ft you posted earlier.... with a top wing of 95.6", and a bottom wing of 92.7", with a chord of 15" gives you roughly a total of 2824.5 sq / inches, or 19.6 sq ft of wing area... given those numbers, you're looking at 40.78 oz / sq ft, or 0.283 of an once per sq inch.... that makes more sense, so its not an exact 46% then.
John M,