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| Giant Scale Aircraft Discuss Giant RC Scale Aircraft. |
Topic Review (Newest First)
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| 11-29-2010 07:32 PM | ||
| TBrum |
Re: Yak gets transplant Donny... I'm with Jack on the fact that our quads are running too cool!! I've tested the temperature of my Mintor220 after a hard run with 28°C ambient temperatures and it's only hitting 155 - 165°F at the base of the cylinders... I'm told my Mintor should run in the 185 - 200°F range. My game plan for 2011 is to open up the baffling a bit around the the fins to make it less efficient. As for setting up the carbs, I orginally set up the carbs by checking plug colour at different rpms and got it really close! Then, this fall, I tried the twin fuel tank method and tweaked it some more! Oh, and absolutely nothing beats the smoothness of these quads - period!! You won't notice the weight because of the big grin you'll have the whole time! |
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| 11-29-2010 05:13 PM | ||
| goneflyin |
Re: Yak gets transplant Quote:
Yep, multi-cylinder engine noises are a gearhead's aphrodisiac, no?  Jack, the real reason behind the switch from the 170 was vibration. The 170 on RE3's power was awesome, best I've ever had, but it was gonna eat the airplane up in short order. The power pulses were pretty radical- the wingtips would rock a bunch just sitting there idling. But man, the uplines were a treat. So I'm hoping for even a net-zero power increase, with a fraction of the vibration. I got a chance to fly a friends' (Will B.) 300 with a 200L, and it was a real pleasure. He kept wanting the transmitter back for some reason.. greedy I guess. Lee, the plane is a 3W Yak, with a paint scheme ripped off from Nigel Lamb's Red Bull MXS-R. I've had it for years, but only finished it this past spring. Don |
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| 11-29-2010 04:30 PM | ||
| LEE |
Re: Yak gets transplant You guys are making us drool...stop it! What plane is that Donny? Lee |
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| 11-29-2010 02:43 PM | ||
| wingburner |
Re: Yak gets transplant Don, the sound alone will make the 2 lbs. go away.  I had a 170 with pipes also....Your new DA 200 will make any thoughts of owning a large twin again send shivers down your spine. I figured the milled cylinders would make it more critical for tuning and cooling. You're in for a real treat..Enjoy!! 
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| 11-29-2010 02:29 PM | ||
| goneflyin |
Re: Yak gets transplant Thanks Jack. good notes in there... I also have a 30-13L that was awesome on the 170. The Mej's are pretty hard to beat. Apparently the milled 200 is a bit harder to keep cool, or more accurately stated is less forgiving of imperfect cooling setups. Hope the extra 2 lbs on this airplane won't be too noticeable. I don't 3D this airplane so what the heck. Don |
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| 11-29-2010 01:54 PM | ||
| wingburner |
Re: Yak gets transplant Sweet engine..The 200 is the only engine of DA's that I have liked. It's actually quite powerful and very smooth..  As far as tuning I have been doing mine by ear only...As was mentioned factory setting mean nothing...Both carbs on my engine are set leaner on Lo and High needles. Trevor and I have been discussing baffling somewhat..We both believe that his Mintor and my DA are running too cool (mine does not have the milled cylinders)..The air temps where I live are seldom over 80.. I recently sent my 200 back because the gaskets on both carbs were leaking. While in there it had a crankshaft upgrade and they said the engien looked great...But I noticed it could still be leaner and I believe it's running to cold. You'll love it...So far the Mej. 31/12L EVO..30/13L EVO..29/12/3..MSC 32/10..are my favorites..All around the Mej. 31/12L is my favorite for my style of flying...It's whisper quiet with the right prop...Enjoy it!!! |
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| 11-29-2010 12:02 PM | ||
| goneflyin |
Re: Yak gets transplant Quote:
Trev, very good ideas there, interesting with the two tanks. It's currently got only a single tank. I wondered if you've been tuning by cyl temp or plug burn. I use a manometer set and airflow meters to tune multi-carb car engines here at work, but it's all a bit big for the aircraft motor. Also thanks Ralph for the photos. However it really sucks to have to cover up all that pretty bling with a wooden crate! Don |
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| 11-29-2010 07:56 AM | ||
| bigguy |
Re: Yak gets transplant Don, Looks sweet.  For baffeling ideas. Here is a picture of a 200 on another round cowl Yak. |
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| 11-29-2010 04:18 AM | ||
| TBrum |
Re: Yak gets transplant Quote:
 There's a few on FG that basically build a rectangle over top of the quad cylinders that hangs off the front of the fuse and butts up against a big flat baffle that seals off the front of the round cowl. I believe they have made them out of thin aluminum also with a carbon fiber round plate to seal off the front. For synching the carbs, for set-up I now run (2) separate fuel tanks on the quads - each tank is completely separate from the other and each tank feeds a carburator. After you go out and fly, check the tank levels when you land to tell you which carb is richer/leaner than the other. After a bit of tweaking, you'll be able to get nearly exact fuel consumption between the two carbs. From my testing, I found that no two Walbaro carbs are the same - I guess it's just manufacturing tolerances! That being said, I know Wingburner and I set up his DA200 on one tank and I believe he's still running it in the same configuration with 0 issues... like yourself, he can set-up an engine and had no issues with carb synch at all (perhaps he can comment!) Cheers Trev |
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| 11-29-2010 03:12 AM | ||
| scaleguy |
Re: Yak gets transplant Don, That's sweet but that Yak really NEEDS a 3 blade to make it look right! next thing you know we are going to be looking for old VW Beattles to steel there 1300cc engines for our 99% Extras and Yaks! 
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