QQ 86" Yak or EF 88" Yak Poll

[reyn3545]

That might explain why my da50 has dead sticked twice... both times while inverted. Once in a harrier, once in a flat spin.

[poco242]

That video is actually of Chris Hinson, the owner of Extreme Flight, flying the plane. It is a video from his site. He is one hell of a good pilot and that was a great save. If it were me....well...lets just say, I would be ordering another Yak from EF

[Mike c.]

Well, that isn't me flying that yak. I own a KMP yak. I took this video from Extreme Flight's website to tell you the truth. DA does know about this problem, but I haven't tried to fix mine. A member at our feild has. He first made a vent line that goes into a pill bottle. It helped, but didn't fix the problem. He then called DA and they told him to shroud three sides of the stand offs. He then told him that if that didn't work, call him back and he'll tell him the next thing to do. All of these things helped, but didn't fix it all together. Thats why I recommend companies that have taken the time to add the vent lines, and the velocity stack, to make sure that this doesn't happen. It makes one wounder though, if other companies know the problem and have fixed it, why not DA?

[poco242]

Some people say it is the carb they use. That is not the problem. I use that carb on a few different engines without a problem. Some also say it is the reed valve setup they use. I was told they copied a Brison setup. Not sure if it is true. The carbs are made to run in all positions, so it has to be somthing else.

Anyway. Glad to see the EF yak is winning the poll

[The Flyin Hawaiian]

I have had three DA 50R's and have one left on my EF Yak. All engines are or have been in 3D aircraft, and some I have flipped the Carbs, I have never had any issues with it leaning out in a inverted harrier. But then again I tend to blip the throttle alot, as I get ready to transition. As Far as the the EF demo video with Chris, It is clear that the engine did not come up in time. I believe it appears that the pilot (Chris) might of got on the throttle late in transition from inverted harrier into hover, or the engine was slow to spool up. Either way the end result was pretty spectacular. Save of not, Chris did a great job. Mine is perfectly tuned. DA 50 w/ ES composite pipe, Switched from Beila 23-8 to Vess 23-B with good results, even inverted harriers. The Vess prop yanks a little harder out of a hover and great climbing out speed. I thinks the Vess will stay on for a while!

[Pale Rider]

	Quote: Originally Posted by Sp33d
	I'm trying to keep the price lower so I was thinking these... Rudder: Hobbico CS-80 2BB http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXLN93&P=0 Ali's and Elev's: Hobbico CS-73 2BB ¼ Scale http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXHHV8&P=0 I'll just use some standard 44 oz. on the kill and throttle.

BIG BIG mistake---If you use those servos just save your engine and stomp on the plane cause thats what it will look like shortly after you take off---Once you move up to this size you need to move up on the hardware too..If you cant swing metal geared servos than wait until you can.. I use 5955's all around--but you can get cheaper servos--they just need metal gears..

Ive had 2 DA 50's--they both would load up inverted, knife edge etc--tried all the fixes--my last fix finally worked--I sold them both..Got 2 Brillelli 60's and haven't had 1 problem inverted knife edge whatever--

[jaguar bone]

	Quote: Originally Posted by Pale Rider
	Ive had 2 DA 50's--they both would load up inverted, knife edge etc--tried all the fixes--my last fix finally worked--I sold them both..Got 2 Brillelli 60's and haven't had 1 problem inverted knife edge whatever--

Damn I hate to have to keep reading this negative review by different poster's, but I don't plunge my head in the sand and sing nah, nah, nah, nah, either. I personally have not had a problem (yet) with my EXTRA but you don't see me doing inverted harriers either. Next time I'm at the field with the FH - that will be my special request. If he does not have an issue, I'll copy his DA50 set up to the tee.

[Mike c.]

I think its an airflow issue. I've only seen this happend with yaks and not extras or edges

[leeMcCrory]

	Quote: Originally Posted by Mike c.
	I think its an airflow issue. I've only seen this happend with yaks and not extras or edges

I saw my buddie pancake his Ef 88" on saturday morn' doing a roll from inverted harrier to inverted harrier. hes got a Da 50 on a carbon pipe n was bringing it past inverted a foot off the deck in a nice high alpha n he wasnt working the throttle enough to my mind to keep the throtle lag down, "Due to it being windy he couldnt keep the plane on the deck if he worked the throttle too much?" Says he-Anyway the plane fell outa the roll onto the grass n broke the prop n canopy-Dang lucky reallyBut the engines mounted inverted so when the planes inverted the DAs up the right way

[Pale Rider]

	Quote: Originally Posted by Mike c.
	I think its an airflow issue. I've only seen this happend with yaks and not extras or edges

I agree--somewhat

I have my Brillelli in the same plane and there are no issues so its definitely something with the motor itself.

[STLAV8R]

Are the people with the 88" EF Yak that are having probelms with their DA 50 quitting, while inverted, running the fake louver plate or not? Just curious.

[bosshoss]

My DA's are fine inverted (right side up), it is a matter of tune , I believe. But, I also know that DA investigated YAK cowl problems a few years back...they had an EF Yak for testing...emphasis on HAD.

I watched all kinds of funny things happen last season with my Buddies and thier 3 AW Yaks. There was something funny going on...but the planes didn't last, and they moved on to a better platform.

I quess some of us are lucky, and some aren't. My only problem with a DA that had me scratching my head was the WT210 carb not delivering enough fuel at WOT in an upline. I fixed that with a Walbro carb from a DL-50.

My DA's have otherwise been reliable as sin itself. We have 3 88's that regularly fly at our field, all DA's with stock mufflers. No hiccups....mine is the oldest.