Announcng the BI-3600 inrunner for 70mm fan - Page 4

The Don · Jul 10, 2009, 09:50 PM

Thanks for posting the video! Something is not right though, I am only getting about 100 mph. Your rpms are higher than the HET 6904 and 2W combo but the speed is much less than the 2W combo

You dragging a parachute behind you

fh64_lucky · Jul 10, 2009, 09:52 PM

I thought I am choking exhaust,maybee I should cut some more of tail pipe open,is that black tailpipe to small for 70mm fan?OOPs! I just measured it,Exit is 55mm...LOL were are my sissors!!??

The Don · Jul 10, 2009, 10:04 PM

I just went an measured my 6904 fan and I get the following:

D=69mm
d=32mm

So for 80% FSA you want

De= sqrt(.80) * sqrt(D*D - d*d)
De= .894 * sqrt(69*69 -32*32)
De= 54.65mm = 2.15"

Your size sounds perfect.

Air Sally's flight is about 120 mph on a WM480 and the HET 6904 I though was suppose to be a faster fan so I would think 120-130s would be correct. Maybe you were not giving the plane enough time to accelerate to full speed?

AIR SALLY · Jul 10, 2009, 10:37 PM

Don ...mine had the wemotec 480 ...is that what you ment ? the het set up should be faster than mine .....Lucky do you have one of my inlet ducts? not that that would make up 20mph ...maybe 8-10 depending on how clean your inlet is ...i also use 2.1 -2.2 for tail pipes ...this one has a tight fit to the Air sally glass tail cone. i have some body work that needs fixing so there might be more in it ...plus we had what we call dead air today ....i dont know if it is low pressure or alt density but all of our jets where sluggish ...C/N had some proplems launching some of his stuff..my 16 was doggy on the launch too.

corsair nut · Jul 10, 2009, 10:50 PM

don, from the video, he probably wasnt allowing enough room to get going fast enough, and he was pulling up too soon after the run.

fh64_lucky · Jul 10, 2009, 10:51 PM

Hi AirSally,no,I do not have your duct,and just why is this so!!???Hmmmm???

Lets get on it,and I will overlook your actions this time!

(Please pm me so we can discuss this...Joe)

fh64_lucky · Jul 10, 2009, 10:53 PM

Yes,I agree,this is not the field I ussualy fly at,and was not that secure there,I will do another one at my regular flying field.Because of its power going striaght up,I dont think there is any real problem.It does sound good.

The Don · Jul 10, 2009, 10:54 PM

Quote:

Originally Posted by corsair nut

don, from the video, he probably wasnt allowing enough room to get going fast enough, and he was pulling up too soon after the run.

Yeah something is fishy as the rpms are over 40k and the exit nozzle is correct. I think a new video with longer passes coming and going will get better results. I will say Joe sure loves to hug the ground

I love it!

Don

The Don · Jul 10, 2009, 10:55 PM

Quote:

Originally Posted by AIR SALLY

Don ...mine had the wemotec 480

Oops my bad

Are you using the 480 pro?

fh64_lucky · Jul 10, 2009, 11:02 PM

Hold the phone.....My battery is no good!I just put in my test battery,ohhhh sheesh!!The battery I flew with in video has a problem,My test battery makes EDF scream!It looks like I need to purchase another battery....

The Don · Jul 10, 2009, 11:05 PM

What size lipo you running? I was seeing about 40.5k which is what a 4S2200 will do, a 4S4000 will get you closer to 44k.

fh64_lucky · Jul 10, 2009, 11:15 PM

It was a 25c 3700! My 2650 test battery makes it look real sick!

AIR SALLY · Jul 10, 2009, 11:20 PM

i tried to pm you and it does not work ...what are you saying ? what did i do wrong ? ...there is something wrong with you pm

fh64_lucky · Jul 10, 2009, 11:30 PM

I dont know,it was working...
You know I was just messing with you on ducts,what I was trying to say is...Yes,I would like to purchase it from you....

I will PM you...Joe

The Don · Jul 10, 2009, 11:33 PM

Quote:

Originally Posted by fh64_lucky

It was a 25c 3700! My 2650 test battery makes it look real sick!

Definitely sounds like your lipo is sagging. What brand lipo?

Jul 10, 2009, 10:04 PM	#48
The Don Wonderfully Wicked Join Date: Jan 2002 Location: Willoughby, Ohio Posts: 7,925	I just went an measured my 6904 fan and I get the following: D=69mm d=32mm So for 80% FSA you want De= sqrt(.80) * sqrt(DD - dd) De= .894 * sqrt(6969 -3232) De= 54.65mm = 2.15" Your size sounds perfect. Air Sally's flight is about 120 mph on a WM480 and the HET 6904 I though was suppose to be a faster fan so I would think 120-130s would be correct. Maybe you were not giving the plane enough time to accelerate to full speed? Last edited by The Don; Jul 10, 2009 at 10:42 PM.

Jul 10, 2009, 11:20 PM	#58
AIR SALLY deltas are cool Join Date: Apr 2006 Location: Tehachapi ,CA. Posts: 7,702	lucky i tried to pm you and it does not work ...what are you saying ? what did i do wrong ? ...there is something wrong with you pm

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Jul 10, 2009, 09:50 PM	#46
The Don Wonderfully Wicked Join Date: Jan 2002 Location: Willoughby, Ohio Posts: 7,925	Thanks for posting the video! Something is not right though, I am only getting about 100 mph. Your rpms are higher than the HET 6904 and 2W combo but the speed is much less than the 2W combo You dragging a parachute behind you

Jul 10, 2009, 09:52 PM	#47
fh64_lucky Hey ya'll,watch this! Join Date: May 2005 Location: Lewisville,Tx Go Farmers!!! Posts: 1,717	I thought I am choking exhaust,maybee I should cut some more of tail pipe open,is that black tailpipe to small for 70mm fan?OOPs! I just measured it,Exit is 55mm...LOL were are my sissors!!??

Jul 10, 2009, 10:37 PM	#49
AIR SALLY deltas are cool Join Date: Apr 2006 Location: Tehachapi ,CA. Posts: 7,702	Don ...mine had the wemotec 480 ...is that what you ment ? the het set up should be faster than mine .....Lucky do you have one of my inlet ducts? not that that would make up 20mph ...maybe 8-10 depending on how clean your inlet is ...i also use 2.1 -2.2 for tail pipes ...this one has a tight fit to the Air sally glass tail cone. i have some body work that needs fixing so there might be more in it ...plus we had what we call dead air today ....i dont know if it is low pressure or alt density but all of our jets where sluggish ...C/N had some proplems launching some of his stuff..my 16 was doggy on the launch too.

Jul 10, 2009, 10:50 PM	#50
corsair nut 150mph 90mm JHH COUGAR 3.5KW:D Join Date: Jan 2006 Location: tehachapi, CA Posts: 10,134	don, from the video, he probably wasnt allowing enough room to get going fast enough, and he was pulling up too soon after the run.

Jul 10, 2009, 10:51 PM	#51
fh64_lucky Hey ya'll,watch this! Join Date: May 2005 Location: Lewisville,Tx Go Farmers!!! Posts: 1,717	Hi AirSally,no,I do not have your duct,and just why is this so!!???Hmmmm??? Lets get on it,and I will overlook your actions this time! (Please pm me so we can discuss this...Joe)

Jul 10, 2009, 10:53 PM	#52
fh64_lucky Hey ya'll,watch this! Join Date: May 2005 Location: Lewisville,Tx Go Farmers!!! Posts: 1,717	Yes,I agree,this is not the field I ussualy fly at,and was not that secure there,I will do another one at my regular flying field.Because of its power going striaght up,I dont think there is any real problem.It does sound good.

Jul 10, 2009, 11:02 PM	#55
fh64_lucky Hey ya'll,watch this! Join Date: May 2005 Location: Lewisville,Tx Go Farmers!!! Posts: 1,717	Hold the phone.....My battery is no good!I just put in my test battery,ohhhh sheesh!!The battery I flew with in video has a problem,My test battery makes EDF scream!It looks like I need to purchase another battery....

Jul 10, 2009, 11:05 PM	#56
The Don Wonderfully Wicked Join Date: Jan 2002 Location: Willoughby, Ohio Posts: 7,925	What size lipo you running? I was seeing about 40.5k which is what a 4S2200 will do, a 4S4000 will get you closer to 44k.

Jul 10, 2009, 11:15 PM	#57
fh64_lucky Hey ya'll,watch this! Join Date: May 2005 Location: Lewisville,Tx Go Farmers!!! Posts: 1,717	It was a 25c 3700! My 2650 test battery makes it look real sick!

Jul 10, 2009, 11:30 PM	#59
fh64_lucky Hey ya'll,watch this! Join Date: May 2005 Location: Lewisville,Tx Go Farmers!!! Posts: 1,717	I dont know,it was working... You know I was just messing with you on ducts,what I was trying to say is...Yes,I would like to purchase it from you.... I will PM you...Joe