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RE: Extreme Flight 88 - 4/16/2011 5:12 PM   
JoeAirPort



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quote:

ORIGINAL: closetguy

i had two EF yaks,both needed the incidence tweak a little on the stabs to make them perfect.if you don't mind flying with a little trim, that is all well and good.it's just nice ( for me) to take your hands off the sticks and it flies straight,flat and true with out the control surfaces fighting each other.
i do this on every ARF i buy and it a pretty common problem on all of them,no one builds the way you would build one for your self.


I'm 100% with you on all that. I just got lazy on the 110. Got sick of working on it and just wanted to fly. I can always go back and tweak them if I want. It wasn't off by enough to cause any problems. Just a few clicks of trim.

PS: Another note. My 110 came with a incidence checking list. All of them were either 0, 0.1, -0.1, or 0.2. I'd be a little hesitant to make these any better because I don't think I'd have an accurate enough meter or process to do it. One could argue that I might even make them worse. Just some food for thought. It says on my Robart incidence meter instructions that if everything is under a 1/4 degree don't mess with it.

< Message edited by JoeAirPort -- 4/16/2011 7:44 PM >

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RE: Extreme Flight 88 - 4/16/2011 5:15 PM   
JoeAirPort



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quote:

ORIGINAL: ahylt

Oops typo. The plane dives when i go full throttle not dies. I am using the dle 55 with the stock standoffs. Everybody talks how good this flies but my ef 88 edge flies much better, just not happy with it right now. guess i will wait for the incidence meter and see if it straightens out. Thanks guys


That is an engine thrust problem for sure. You have down thrust if the engine is pulling it down. Same thing as going full throttle and and cutting the throttle. It should climb as it gets close to idle. That means your elevators are pulling it up and the engine pulling it down (only at higher RPM's). Get rid of that down thrust.

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RE: Extreme Flight 88 - 4/23/2011 7:34 PM   
fireblade5437


 

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Status: offline 		Any ideas?

At Luffenham Airfield where we fly we have never had to keep the noise down so to speak but due to a local complaint the club has adopted the BMFA method of testing ie no more than 82db at 7m aircraft place to N,S,E and W etc.

My set up is DLE55 with full pipe MTW (was advised to get this pipe on RCU and has been brilliant) Carbon prop 23x8.

Anyone got suggestions to make the magic 82db? currently mine at 7m is 89-90db. Now when I tried a 23x10 carbon the engine got a bit hot.

Over to your suggestions!



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RE: Extreme Flight 88 - 4/25/2011 2:55 AM   
ahylt


 

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Status: offline 		my yak came with the incedence paper to, they were all within 0.1. Got the incedence meter and best i can tell the incedence is just fine. I put 1 washer in to give it up thrust and seemed to help. Going to put 1 more in and see how it does. It finally harried and hovered so its getting better but it still has up elevator trimmed in. Atleast it flew much better.

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RE: Extreme Flight 88 - 4/25/2011 1:33 PM   
JoeAirPort



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Status: offline 		That's great. I assume you're doing this but make sure to re-trim the elevators during flight after you add washers. Then do your thrust test by flying straight and level at high throttle. Then chop throttle. It should maintain altitude for a while (and not gain altitude). Removing the engine up thrust lets you remove some of the up elevator trim you had in there. Sounds like you're getting there.

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RE: Extreme Flight 88 - 4/27/2011 7:02 PM   
flygilmore



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quote:

ORIGINAL: fireblade5437

Any ideas?

At Luffenham Airfield where we fly we have never had to keep the noise down so to speak but due to a local complaint the club has adopted the BMFA method of testing ie no more than 82db at 7m aircraft place to N,S,E and W etc.

My set up is DLE55 with full pipe MTW (was advised to get this pipe on RCU and has been brilliant) Carbon prop 23x8.

Anyone got suggestions to make the magic 82db? currently mine at 7m is 89-90db. Now when I tried a 23x10 carbon the engine got a bit hot.

Over to your suggestions!





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RE: Extreme Flight 88 - 5/8/2011 6:57 AM   
cmircman


 

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Status: offline 		Can anyone please save me some time in reading this thead ad let me know where everyone is setting thier CG at? Thnaks in advance.

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RE: Extreme Flight 88 - 5/8/2011 4:07 PM   
JoeAirPort



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Status: offline 		Depends on your flying taste really. At the front of the range for IMAC, near the middle for 3D stuff. I think mine is at 7 1/4". The range is 6 3/4" to 7 1/2" at wing root.

http://www.extremeflightrc.com/manuals/88YakManualRev2.pdf

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RE: Extreme Flight 88 - 5/8/2011 11:30 PM   
cmircman


 

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Status: offline 		Thanks Joe I did already download the manual. The problem I am having is with a Dl50 with the stock muffler and standoffs And adding another A123 batter that is not even hooked up I am still way to tail heavy. I am trying to think of was to add usefull weight.

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RE: Extreme Flight 88 - 5/9/2011 2:11 PM   
JoeAirPort



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Status: offline 		I have that same exact engine setup. My ignition battery is next to the tank. The rx batt is behind the wing tube. No pilot or dash. Perfect balance.

Do you have the louver on the cowling? Also what prop and spinner? I can't imagine what would make yours so tail heavy when your setup is just like mine.

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RE: Extreme Flight 88 - 5/9/2011 2:39 PM   
cmircman


 

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Status: offline 		Thats what i could not figure out. Before I started to build this I skimmed through this thread and saw you setup and thought well this will be easy. I am running a xoar 22x8 prop. I am looking to order a new spinner and a new cowl for this plane as i got this plane used and the cowl has been really cut up.

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RE: Extreme Flight 88 - 5/9/2011 3:45 PM   
Slow and Steady


 

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Status: offline 		I fly with a DLE 55 with stock muffler and Vess 23 B. My 4" Tru Turn spinner weighs approximately 4 oz. with the lightened back plate. I also reinforced the polystyrene cowl baffle with fiberglass, after the first one developed a crack. I also reinforced the perimeter of any cowl cut outs and added epoxy in the engine box corners. My 2 Life 2100 Mah batteries are located behind fuse rib located behind the wing bolts. People I know, who fly without the spinner, baffle, etc. appear to have the same issue as yourself. My CG is around 7". It was very nose heavy at 7 1/2.

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RE: Extreme Flight 88 - 5/9/2011 3:46 PM   
JoeAirPort



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Status: offline 		Are you using a spinner when you're checking the CG? That affects the balance a lot. My spinner is about 3.5 ounces. It's CF. Also my louver plate added a couple of ounces with the glass I used to reinforce it. What is your CG right now? I think 7.5" is the aft end of the range.

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RE: Extreme Flight 88 - 5/9/2011 6:19 PM   
cmircman


 

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Status: offline 		You guys hit it right on the nose. I was trying to get by without using a spinner. I never really had a plane that could not balance without a spinner and I was unsure if the spinner would be enough. I was also debating on running a ks86 cannister but it looks like that may move the CT even more aft. Right now it is still tail heavy measuring at 7 1/2 inches.

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RE: Extreme Flight 88 - 5/9/2011 9:22 PM   
frieshoo



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quote:

ORIGINAL: fireblade5437

Any ideas?

At Luffenham Airfield where we fly we have never had to keep the noise down so to speak but due to a local complaint the club has adopted the BMFA method of testing ie no more than 82db at 7m aircraft place to N,S,E and W etc.

My set up is DLE55 with full pipe MTW (was advised to get this pipe on RCU and has been brilliant) Carbon prop 23x8.

Anyone got suggestions to make the magic 82db? currently mine at 7m is 89-90db. Now when I tried a 23x10 carbon the engine got a bit hot.

Over to your suggestions!




You could achieve 82db by going to a Biela 3 bladed CF 22x10.

Biela 2 bladed CF props are pretty quite.

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RE: Extreme Flight 88 - 5/9/2011 11:24 PM   
fireblade5437


 

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Status: offline 		Thanks for that.

Is that a combination you have tried with DLE 55?

Alan

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RE: Extreme Flight 88 - 5/10/2011 5:51 PM   
frieshoo



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quote:

ORIGINAL: fireblade5437

Thanks for that.

Is that a combination you have tried with DLE 55?

Alan


I have only used the Biela 23x8 2 bladed prop on a DLE55. Nice prop, IMO. It might be above 82db, however.

Here is a Biela 2 bladed prop on a DLE55, you might contact this guy and get the db readings.

http://www.youtube.com/watch?v=spKv0hTaEY8

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RE: Extreme Flight 88 - 5/10/2011 11:09 PM   
fireblade5437


 

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Status: offline 		Thanks will try to contact him, I definitely recognise that sound! I was hoping having the MTW system on would help to reduce the noise over the standard DLE system which I am sure it does but the exhaust is not going to silence prop noise! I need to find someone who has had to find a quieter set up.

Alan

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RE: Extreme Flight 88 - 5/31/2011 5:55 PM   
weezle


 

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Status: offline 		here is my yak after 6 or 7 flights.

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RE: Extreme Flight 88 - 6/6/2011 2:25 PM   
JoeAirPort



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quote:

ORIGINAL: weezle

here is my yak after 6 or 7 flights.


Cool. Looks awesome. Had mine out last weekend.

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RE: Extreme Flight 88 - 6/6/2011 9:56 PM   
Slow and Steady


 

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Status: offline 		Have over 150 flights since mid February (sunny South Florida). Love the plane. The landing gear is also great - I am sure it has saved the fuselage from several rough landings. Only limited by my thumbs. That being said, I am considering carbon fiber gear. Any thoughts or opinions would be appreciated.

< Message edited by Slow and Steady -- 6/7/2011 2:34 AM >

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RE: Extreme Flight 88 - 6/7/2011 1:56 PM   
JoeAirPort



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Status: offline 		It's fine as long as you don't pan cake the plane or have a rough landing. I have CF in my 110" yak. It came with the kit. One thing I like about CF is that the legs don't spread out like the alum.

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RE: Extreme Flight 88 - 6/11/2011 12:21 PM   
iliveonthemoon


 

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Status: offline 		well after about 20 flights, my Yak went in this morning.

wing bolt failed somehow on the third flight and the wing parted company with the rest of the model.

complete write-off unfortunately.

I've contacted the distributor in the UK about this but they don't seem willing to discuss the situation.

so disappointed. loved this plane.

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RE: Extreme Flight 88 - 6/11/2011 1:59 PM   
AirWizard



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Status: offline 		That is very unusual.....I've had hundreds of flights and never had a wing bolt fail

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RE: Extreme Flight 88 - 6/13/2011 7:29 PM   
JoeAirPort



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Status: offline 		Sorry to hear about that. Not sure what happened but you shouldn't over tighten the bolts. Just snug them up with a little muscle and that's it. Can't crank on them like metal bolts. Also can't leave them too loose or they back out. With that said, never had one break of back out on 4 EF planes. Or any other plane for that matter. It's a good idea to replace the wing bolts after a few years....but...I have an Extra on season 4 with the same bolts. So they are pretty tough.

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