37% Ultimates

[krayzc]

i think that is a good deal on the ultimate and I always have liked seeing or hearing about this bird even though i do not have this one.....

[Ken-H]

	Quote: Originally Posted by Bat Fastard
	My engine runs great, no complaint there. The cooling issue is a bit different tho. I never thought baffeling was absolutly critical until I installed an Eagle Tree data telemetry system and saw what was actually going on. When I saw the CHT's rising close to the 340 degree mark during a hover that lasted only about 20-30 seconds, I thought that there should be some way to avoid this high of reading. I then installed a much tighter baffle system, to the best of my understanding in an effort to cool it. It worked, but only to a small increase in cooling capacity. After that I was able to harrier for about 10seconds, transition into a hover and see yet again the CHT's get close to 340 degrees in about 20-30seconds. Normal flying is fine for cooling and it cools off the quickest at full throttle in level flight. I dont want to cook my engine that runs great and doesn't have a place of service at this time. Just wondering how you were able to keep your engine cool enough to prevent damage. BF

Hi BF,

Sorry your having these overheating problems. I do not have an on board temp monitor so temps in flight and hovering are unknown to me. What prop are you running on that motor? Perhaps it's loading up the motor and getting hot. I know temps in the mid 200's are not uncommon upon landing so higher temps while hovering will be higher.

Ken

[Bat Fastard]

After talking to a local aircraft mechanic about cooling etc., he suggested that the slant on the bottom of the cowl might be preventing hot air from leaving the cowl instead of helping. When it's in a harrier the slant isn't a slant at all. Its a effective scoop for air to enter at high AOA or at least block the airflow "thru" the cowl for cooling. He suggested a few things such as a servo operated "flap" to reverse the airflow when at high AOA however, none of his options seem possible.

About the "overheating" issue, I'm not exactly sure at what temp is considered overheating. The engine has always run perfectly. Even at the 320-330 degree range. The only way I know its hot, is from the Eagle Tree system. Perhaps not knowing whats going on is better than trying to resolve a problem that may not be that much of a problem at all. I'm going to try to make a fiberglass, two piece duct, molded to the engines cylinders, after cutting the cowl in half, to see if that will help. If it doesnt, I'll be able to tell everyone at what temp a BME will self dectruct. LOL

As you stated before, The engine has incredible power in this airframe, and it flys great. I would just like to find a way to make it (the engine) last.

BF

[dgiordano]

hey sweetpea I got rained out on monday, but when I get into it I will post some pictures.Darn that rain!!

[JohnVH]

I have a DA100 in mine with no baffles, come to think of it, Ive never baffled a plane yet, but it doesnt get as hot as some other area's here.

[harv]

hey john, what prop you swinging on that ultimate, and how do you like it?



harv

[JohnVH]

	Quote: Originally Posted by harv
	hey john, what prop you swinging on that ultimate, and how do you like it? harv

Hey! Sorry for the late reply, I had the notifications turned off so I didnt know you asked a question. I have a PAU/BME 28x10 prop on my DA100, I put 28x10's on all my 100's. It works awesome, motor is happy, so Im happy, Ive used a few different of their props on my 50cc and my 150cc birds and I love them, best wood props Ive used so far. Hope that helps

[krayzc]

John what makes this prop line up stand out in your mind? I have never tried this brand.

[harv]

	Quote: Originally Posted by JohnVH
	Hey! Sorry for the late reply, I had the notifications turned off so I didnt know you asked a question. I have a PAU/BME 28x10 prop on my DA100, I put 28x10's on all my 100's. It works awesome, motor is happy, so Im happy, Ive used a few different of their props on my 50cc and my 150cc birds and I love them, best wood props Ive used so far. Hope that helps

hows the sound with that prop. (im trying to find a prop for my 106 QS)


harv

[JohnVH]

Dang, I still dont get notifications, sorry guys. This prop pulls awesome, the engine revs good, snappy, not as loud as some others in my opinion, Ive used zinger, menz, 3w, and cant remember what other props so far. But I put these on all mine now. THeir 3D props are awesome too. Ken can give the specs on them.

[luv2flyguy]

Hey John- I have always loved Ultimates, I had one for my second plane when learning to fly years ago (seems like forever) just curious about something. Would a DA-85 fly this plane and if so do you think it could be balanced? Thanks and I am seriously considering one.

[dbcaster]

	Quote: Originally Posted by luv2flyguy
	Hey John- I have always loved Ultimates, I had one for my second plane when learning to fly years ago (seems like forever) just curious about something. Would a DA-85 fly this plane and if so do you think it could be balanced? Thanks and I am seriously considering one.

I am in the same boat. Some one needs to try it and give a report. I may just do it but I haven't decided yet. I figure worst case if it doesn't have enough power I can just put a pipe on it.

[dgiordano]

Hey sweetpea, sorry it took me a while to get you these photos. The 3W106 fits great. It is a little heavier than other engines in its class but I just made a mounting deck for the batts. in the fuse behind the canopy. That balanced it out about 1/8 inch forward of the rear cg location.

[Bat Fastard]

What is the AUW?

[JohnVH]

Oh, the DA85 will fly the plane, I have no doubts of that. Depending on your elevation and setups vertical from hover will be the difference. but Im sure it will hover regardless.