Extreme Flight 88" Yak - Build and Fly
03-02-2011, 07:27 PM
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RE: Extreme Flight 88
Hey Joe, I just described my results, which are effectively the suggested amount, but did not give the 3/4. I believe the manual says "about 3/4 inches". I agree that it is a non issue. My main concern was that I had some overlap and the 1" clearance with the cowl was accomplished. Yesterday, a fellow at our field was flying the 110" Yak and he had no overlap. I don't know how consistent that is with that manual, but didn't seem to effect the plane or his talent and ability. Love this plane and have to admit I was nervous about getting the build right to make sure I did it justice.
03-03-2011, 05:44 AM
RE: Extreme Flight 88
S and S, no problem dotting your i's and crossing your t's. This plane is worth all the extra effort. I'm the same way.
If you're trying to get cowling right up near the spinner back plate that might make the overlap shorter. I have my cowling pretty far behind the spinner. I don't mind it. Everybody's taste is a little differernt.
If you're trying to get cowling right up near the spinner back plate that might make the overlap shorter. I have my cowling pretty far behind the spinner. I don't mind it. Everybody's taste is a little differernt.
03-03-2011, 12:59 PM
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RE: Extreme Flight 88
I have the one inch gap between the thrust washer and cowl. Prop is alittle further out due to the thickness of the spinner hub. This all seams like a non issue, with a final result similar to the manual recommendations.
03-03-2011, 10:53 PM
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RE: Extreme Flight 88
I went home and re-checked the length of my standoff's+ engine and you are right joe, I have no idea what I was looking at, but everything was right on the money
03-04-2011, 06:00 AM
RE: Extreme Flight 88
Cool. The DL-50 and DLE-55 are perfect bolt-on engines for this air frame. DA-50 is too with the right stand off's. DA has several sizes.
Glad you guys are both all set.
Glad you guys are both all set.
03-09-2011, 10:20 AM
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RE: Extreme Flight 88
here some photos of my progress motor is mounted. A friend of our club has a laser cutter and a CAD program so he cut the mount for me and I put it together.
03-23-2011, 11:26 AM
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RE: Extreme Flight 88
So, for those of you running a pipe, which pipe are you running? I'm thinking it's about time I pipe my yak. I'm currently running a DA50 on stock muffs and I'm looking for a little more oomph.
03-23-2011, 11:43 AM
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RE: Extreme Flight 88
RE2
KS1060
ES Composite...
all are good
25mm drop for the headers.
The ES composite are nice, light, have good power...but they are a bit pricey
KS1060
ES Composite...
all are good
25mm drop for the headers.
The ES composite are nice, light, have good power...but they are a bit pricey
03-23-2011, 01:58 PM
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RE: Extreme Flight 88
ORIGINAL: House2twist
So, for those of you running a pipe, which pipe are you running? I'm thinking it's about time I pipe my yak. I'm currently running a DA50 on stock muffs and I'm looking for a little more oomph.
So, for those of you running a pipe, which pipe are you running? I'm thinking it's about time I pipe my yak. I'm currently running a DA50 on stock muffs and I'm looking for a little more oomph.
Frank..
03-28-2011, 10:42 AM
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RE: Extreme Flight 88
Got Yak #2 ready for the maiden. Hopefully, this will be the last snow of the year. I went with Futuba servos for this one. I'm a little concerned about the rudder wag with only 200 oz-in of the torque. It has S9153's all around, except throttle (9252).
03-31-2011, 05:50 PM
RE: Extreme Flight 88
Cool, glad to hear you got a #2. What happened to #1? I would not tension the rudder cables too much. Just take out the slack. I think that can cause rudder wag. 200 ounces is not too bad for rudder. See how it works and if you need more, easy to change it out. I'm almost done with my 110 Yak and can't wait to fly it. Like you I hope no more snow. I should be ready for a maiden in a week or so. And I stress the so.
03-31-2011, 06:02 PM
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RE: Extreme Flight 88
Any thoughts on prop size for the EF Yak with DLE 55 and stock muffler. I am currently using a Vess 22 B, but I'm thinking about the 23 B. The 22 B turns at 7,200 RPM restrained on the ground. DLE's manual rates the engine at 5.5 HP at 7,500 RPM, if that has any bearing. Vertical appears unlimited but slow.
03-31-2011, 06:18 PM
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RE: Extreme Flight 88
ORIGINAL: Slow and Steady
Any thoughts on prop size for the EF Yak with DLE 55 and stock muffler. I am currently using a Vess 22 B, but I'm thinking about the 23 B. The 22 B turns at 7,200 RPM restrained on the ground. DLE's manual rates the engine at 5.5 HP at 7,500 RPM, if that has any bearing. Vertical appears unlimited but slow.
Any thoughts on prop size for the EF Yak with DLE 55 and stock muffler. I am currently using a Vess 22 B, but I'm thinking about the 23 B. The 22 B turns at 7,200 RPM restrained on the ground. DLE's manual rates the engine at 5.5 HP at 7,500 RPM, if that has any bearing. Vertical appears unlimited but slow.
04-01-2011, 04:40 AM
RE: Extreme Flight 88
ORIGINAL: Slow and Steady
Any thoughts on prop size for the EF Yak with DLE 55 and stock muffler. I am currently using a Vess 22 B, but I'm thinking about the 23 B. The 22 B turns at 7,200 RPM restrained on the ground. DLE's manual rates the engine at 5.5 HP at 7,500 RPM, if that has any bearing. Vertical appears unlimited but slow.
Any thoughts on prop size for the EF Yak with DLE 55 and stock muffler. I am currently using a Vess 22 B, but I'm thinking about the 23 B. The 22 B turns at 7,200 RPM restrained on the ground. DLE's manual rates the engine at 5.5 HP at 7,500 RPM, if that has any bearing. Vertical appears unlimited but slow.
04-01-2011, 07:14 PM
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RE: Extreme Flight 88
My prop is alittle over an inch from the leading edge of the cowling. I went from 22b to 23b today and didn't notice much difference. Today, A friend who has had 3 ef yaks also suggested the 23a. I will order and try. I noticed the DLE manual recommeds high octane gas; I believe 92. I am running on 87 and wonder if that is effecting performance also. This link shows a DLE 55 stock muffler and 23a with some pretty strong pull out: http://www.youtube.com/watch?v=pNdIOX3rkwY
04-02-2011, 06:36 AM
RE: Extreme Flight 88
Increased octane won't increase power if the engine was designed for low octane gas (it was). It's for much higher compression engines to control combustion timing. Just low octane is all you need. Mid to high won't hurt it though. In really hot weather the high octane can keep the engine from detonating (that crackly sound at high RPM's). Also good for tuned pipes. You have the high needle tuned for peak RPM's? The 55 is a strong engine. Maybe the 23A will have better pull out. I think the huge cowling can hinder prop efficiency but I'm no expert on that. Just a theory that some of us share. Sounds like you have a good enough gap. I think my spacing is the same as yours. MY pull out is pretty good. It's a DL-50 with stock exhaust. Xoar 22x8 beech wood. I pasted a couple of videos of mine below.
http://www.youtube.com/watch?v=ynkFiYZOS7k
http://www.youtube.com/watch?v=z1SD21qAJoA
http://www.youtube.com/watch?v=ynkFiYZOS7k
http://www.youtube.com/watch?v=z1SD21qAJoA
04-02-2011, 05:06 PM
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RE: Extreme Flight 88
Hi Joe, I saw that first video months ago, when it was first posted. At the time, I suggested EF add a link from its site. It is a great video. Your a great flyer and I enjoy watching it; it is really well made -the videographer deserves some strong cudos also. I pulled out the Chinese manual for the DLE 55 and it recommends "clean petrol 93#, which I presume means 93 octane - their manual leaves alot to be desired. A later manual that I downloaded from the Tower site reccommends 87 to 93. What you noted about octane results sounds reasonable. I will post my max rpm and pull out after I run the 23a, while remaining with the 87 octane, 40 to 1 Red Line mix. I should note that my plane has not been weighed and I should check that before assuming it is a prop issue. I did some mods that likely put it on the upper end of the weight range. I did notice after changing from the 22b to the 23b that I had better braking and increased snap response, likely due to the diameter increase and increased prop wash beyond the cowl. Thanks for the help and advise, and the great videos.
04-03-2011, 01:36 AM
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RE: Extreme Flight 88
Somewhere I read that the 93 octane in the book refers to what they get overseas where the engine is built. If I remember correct it is similar to the 89 octane that we have at the pump using the RM/2 method over here. 93 there like 89 here.
It has been a while.....but I tried 100 octane race gas in my DA-50 on stock muffler....no rpm gain...back to regular pump gas same top end rpm.
Weight of airplane will reflect in how quick it goes up on a vertical line with a similar engine/prop/thrust combo. If you plane for example weighs 16 pounds and you have 32 pounds of thrust you have 2-1 power to weight ratio....this will yield scalding up lines... in another example, if the plane weighs 18 pounds and you only have 28 pounds of thrust (pure examples) then you might only have 1.55 power to weight....much slower pull out. Most 3D pilots can fly 3D at 1.5 to one...most would rather have 2 to one.
What oil are you using?
It has been a while.....but I tried 100 octane race gas in my DA-50 on stock muffler....no rpm gain...back to regular pump gas same top end rpm.
Weight of airplane will reflect in how quick it goes up on a vertical line with a similar engine/prop/thrust combo. If you plane for example weighs 16 pounds and you have 32 pounds of thrust you have 2-1 power to weight ratio....this will yield scalding up lines... in another example, if the plane weighs 18 pounds and you only have 28 pounds of thrust (pure examples) then you might only have 1.55 power to weight....much slower pull out. Most 3D pilots can fly 3D at 1.5 to one...most would rather have 2 to one.
What oil are you using?
04-03-2011, 09:46 AM
RE: Extreme Flight 88
ORIGINAL: Slow and Steady
Hi Joe, I saw that first video months ago, when it was first posted. At the time, I suggested EF add a link from its site. It is a great video. Your a great flyer and I enjoy watching it; it is really well made -the videographer deserves some strong cudos also. I pulled out the Chinese manual for the DLE 55 and it recommends ''clean petrol 93#, which I presume means 93 octane - their manual leaves alot to be desired. A later manual that I downloaded from the Tower site reccommends 87 to 93. What you noted about octane results sounds reasonable. I will post my max rpm and pull out after I run the 23a, while remaining with the 87 octane, 40 to 1 Red Line mix. I should note that my plane has not been weighed and I should check that before assuming it is a prop issue. I did some mods that likely put it on the upper end of the weight range. I did notice after changing from the 22b to the 23b that I had better braking and increased snap response, likely due to the diameter increase and increased prop wash beyond the cowl. Thanks for the help and advise, and the great videos.
Hi Joe, I saw that first video months ago, when it was first posted. At the time, I suggested EF add a link from its site. It is a great video. Your a great flyer and I enjoy watching it; it is really well made -the videographer deserves some strong cudos also. I pulled out the Chinese manual for the DLE 55 and it recommends ''clean petrol 93#, which I presume means 93 octane - their manual leaves alot to be desired. A later manual that I downloaded from the Tower site reccommends 87 to 93. What you noted about octane results sounds reasonable. I will post my max rpm and pull out after I run the 23a, while remaining with the 87 octane, 40 to 1 Red Line mix. I should note that my plane has not been weighed and I should check that before assuming it is a prop issue. I did some mods that likely put it on the upper end of the weight range. I did notice after changing from the 22b to the 23b that I had better braking and increased snap response, likely due to the diameter increase and increased prop wash beyond the cowl. Thanks for the help and advise, and the great videos.
Mine is 17# 13 oz dry and with the DL-50 sock exhaust...the pull out is not rocket but plenty for my needs. My Extreme Flight 100" Yak with DA-120 will very likely have a 2:1 thrust to weight ratio. The engine is supposed to grunt out 60# of thrust and my plane is going to weigh about 28 lbs.