Project Dyn-E-Max/ TJ A-4 - Page 2

wocketman · Oct 15, 2009, 08:20 PM

Hi Ron 101,

It would be good to see the video w/o the music so I can hear the throttle management. It sounds like you are in the throttle a lot?

Ron101 · Oct 15, 2009, 09:34 PM

Cool to see all the interest... thanks guys
Wocketman if you look at the rest of my videos there is a video of it with no music...

Well guys... I'm more confused than ever now..lol
I've been flying this plane for quite some time now.. 50+ flights and the weight is more than I thought and the power is less.. but it flys so nice. I bought a really nice digital Berkley Fish Scale that goes up to 65 pounds.. I havn't checked the weight since I swaped out to 30c packs many flights ago.. my old school scale has been off.. so I need to recheck all my planes
wish I would have bought this scale along time ago it works great for checking thrust also... so here's the numbers

Ready to fly weight is 17 lbs 9 oz !!

DS-94 1521 2y on 12s 30c 5000 TP pro power packs

Throttle******Watts*******Amps*******pounds installed thrust

1/2*********(1680)*******(35)************(3.14)
3/4*********(2540)*******(56)*************(8)
Full*********(3950)*******(90)************(10.2)

it does burst to 4200 watts but settles quickly to 3950

So I'm really shocked that it will cruise once on step with only 1/2 throttle ..3 pounds thrust!! lol... that's funny.. I know it has to over come the friction of the wheels but that can't be much force
and at full it's only making 10.2 pounds and 3950 watts... but it flys so nice
in a way this makes me feel better .. almost like number really don't matter all that much... after dinner I'm going to pull out the fan and start working on the install... then I'll run these test in the same exact way either tomorrow or Saturday... I'll keep you posted

Ron

BobH13 · Oct 15, 2009, 09:45 PM

When measuring the force just make sure that the teather is parallel to the direction of force. No angles up or down or your scale won't read all the force.

Ron101 · Oct 15, 2009, 10:01 PM

yep... held it nice and straight at the time of the readings

kevin · Oct 15, 2009, 10:04 PM

dangle it off the end of the string and go to full throttle..you will get a no friction reading

corsair nut · Oct 15, 2009, 10:07 PM

ive told people for a while. static dosnt mean jack. youve got to be recouping alot once in air and the inelts begin to work better. at 4kw, in perfect situation(ie inlet lip, short tail pipe bench test)youd probably see 12-13 lbs of thrust.

corsair nut · Oct 15, 2009, 10:13 PM

those 5 ft long power extensions couldnt be helping either.. :O

Ron101 · Oct 15, 2009, 10:21 PM

Quote:

dangle it off the end of the string and go to full throttle..you will get a no friction reading

it will be like a kite ... sweet!

Quote:

static dosnt mean jack

I agree ..on the first page I said all these number will mean nothing.. the flight test will will tell the tell... and if my reading are messed up.. I'll do them the exact same way for the dyn-e-max.. so they will be just as messed up

Ron101 · Oct 16, 2009, 12:23 AM

Before I removed anything .. I put in the packs and checked the CG on my Vanessa CG rig. I'm sure many of you have seen them before but for the newer guys I've found now better way to check CG on the bigger planes.

I need to apologize for the last couple years I've been saying that my DS-94 and CC110 HV is 1lbs 6oz.. I was wrong. It's 1 lbs 12.2 oz. The Dyn-E-Max with the CC110 HV is 2 lbs. 3.5 oz... so I'm going to gain 7oz.

I could lose that 7oz by running one air tank and one servo for the retracts and brakes and be at the same weight I was before.. but I really don't think 7oz is going to matter

So I'm going to be 18 lbs... up from 17 lbs 9oz
I think it's going to fly just fine

There is going to be about a 3/8 gap in the ducting... I could cut it top and bottom a few inches up the duct and flair it out to meet in the middle.. but I think I might be better off just leaving it and grabing some extra air ( what do you guys think?)

So back to it in the morning

later
Ron

rvincent · Oct 16, 2009, 12:36 AM

No Ron you need to seal it up. it makes a big difference

Ron101 · Oct 16, 2009, 12:38 AM

Thanks Bob.. I can do a pretty easy mod to close it up.. I'll take your advise
I know Stu would say the say thing

thanks bud

rvincent · Oct 16, 2009, 12:40 AM

Hey we're Scooter Jocks

We watch each other's back

Ron101 · Oct 16, 2009, 01:10 AM

I just found 5 oz to shave.. I'm dropping to one big air tank for brakes and retracts ( I have two now).. tossing one RX pack and regulator.. I used those heavy extension locks.. I'll use fishing line.. if I can find 2 more oz.. I'll be back to my starting weight of 17 lbs 9 oz

I'll find those 2oz

it may sound crazy to drop one 2s 1350 pack.. but after four flights I take out 150 mah out of eash... forget that it's gone

I may lose the brake servo too.. that would give me my original weight... do the one servo setup... for brakes and retracts.. which means I'll will have an extra channel then I could lose the servo reverser I have on the nose wheel..

Hell I'll be lighter than I was to start

corsair nut · Oct 16, 2009, 01:25 AM

not sure what you have planned, but id just cut the inner walls free from the rounded outside of the ducts about 3" up stream from the fan, then glue them together to a taper right in front of the fan, then cut your half circle for spinner clearance....

rvincent · Oct 16, 2009, 01:28 AM

?? Brent my ducts are 1/2 circles. There is now spinner relief in the center?

Oct 15, 2009, 08:20 PM	#16
wocketman Registered User Join Date: Apr 2003 Location: Lawrence, KS Posts: 79	TJ A-4 w/DS-94 Hi Ron 101, It would be good to see the video w/o the music so I can hear the throttle management. It sounds like you are in the throttle a lot?

Oct 15, 2009, 09:34 PM	#17
Ron101 Registered User Join Date: Jul 2007 Location: Brentwood, California Posts: 1,924	Baseline numbers are in and I'm shocked Cool to see all the interest... thanks guys Wocketman if you look at the rest of my videos there is a video of it with no music... Well guys... I'm more confused than ever now..lol I've been flying this plane for quite some time now.. 50+ flights and the weight is more than I thought and the power is less.. but it flys so nice. I bought a really nice digital Berkley Fish Scale that goes up to 65 pounds.. I havn't checked the weight since I swaped out to 30c packs many flights ago.. my old school scale has been off.. so I need to recheck all my planes wish I would have bought this scale along time ago it works great for checking thrust also... so here's the numbers Ready to fly weight is 17 lbs 9 oz !! DS-94 1521 2y on 12s 30c 5000 TP pro power packs Throttle****Watts***Amps***pounds installed thrust 1/2*****(1680)***(35)********(3.14) 3/4*****(2540)***(56)*********(8) Full*****(3950)***(90)*********(10.2) it does burst to 4200 watts but settles quickly to 3950 So I'm really shocked that it will cruise once on step with only 1/2 throttle ..3 pounds thrust!! lol... that's funny.. I know it has to over come the friction of the wheels but that can't be much force and at full it's only making 10.2 pounds and 3950 watts... but it flys so nice in a way this makes me feel better .. almost like number really don't matter all that much... after dinner I'm going to pull out the fan and start working on the install... then I'll run these test in the same exact way either tomorrow or Saturday... I'll keep you posted Ron Attached Thumbnails plane setup to pull... it works very well 87.9 KB · Views: 76 just hold it and set the throttle where you want it 76.6 KB · Views: 94 getting some numbers 96.6 KB · Views: 104 Last edited by Ron101; Oct 15, 2009 at 09:44 PM.*

Oct 16, 2009, 12:23 AM	#24
Ron101 Registered User Join Date: Jul 2007 Location: Brentwood, California Posts: 1,924	Before I removed anything .. I put in the packs and checked the CG on my Vanessa CG rig. I'm sure many of you have seen them before but for the newer guys I've found now better way to check CG on the bigger planes. I need to apologize for the last couple years I've been saying that my DS-94 and CC110 HV is 1lbs 6oz.. I was wrong. It's 1 lbs 12.2 oz. The Dyn-E-Max with the CC110 HV is 2 lbs. 3.5 oz... so I'm going to gain 7oz. I could lose that 7oz by running one air tank and one servo for the retracts and brakes and be at the same weight I was before.. but I really don't think 7oz is going to matter So I'm going to be 18 lbs... up from 17 lbs 9oz I think it's going to fly just fine There is going to be about a 3/8 gap in the ducting... I could cut it top and bottom a few inches up the duct and flair it out to meet in the middle.. but I think I might be better off just leaving it and grabing some extra air ( what do you guys think?) So back to it in the morning later Ron Attached Thumbnails My vannesa CG rig 63.9 KB · Views: 81 DS-94 1521 2y and CC110 HV 1 lbs 12.2oz 93.1 KB · Views: 78 Dyn-E-Max and CC110 HV 2 lbs 3.5 oz 61.8 KB · Views: 71 just a touch of trimming 65.6 KB · Views: 86 alomst a 1/2 gap in the ducting 68.4 KB · Views: 74

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Oct 15, 2009, 09:45 PM	#18
BobH13 Registered User Join Date: Mar 2009 Posts: 37	When measuring the force just make sure that the teather is parallel to the direction of force. No angles up or down or your scale won't read all the force.

Oct 15, 2009, 10:01 PM	#19
Ron101 Registered User Join Date: Jul 2007 Location: Brentwood, California Posts: 1,924	yep... held it nice and straight at the time of the readings

Oct 15, 2009, 10:04 PM	#20
kevin Registered EDF abUser Join Date: Aug 1999 Location: ohio Posts: 2,495	dangle it off the end of the string and go to full throttle..you will get a no friction reading

Oct 15, 2009, 10:07 PM	#21
corsair nut 150mph 90mm JHH COUGAR 3.5KW:D Join Date: Jan 2006 Location: tehachapi, CA Posts: 10,134	ive told people for a while. static dosnt mean jack. youve got to be recouping alot once in air and the inelts begin to work better. at 4kw, in perfect situation(ie inlet lip, short tail pipe bench test)youd probably see 12-13 lbs of thrust.

Oct 15, 2009, 10:13 PM	#22
corsair nut 150mph 90mm JHH COUGAR 3.5KW:D Join Date: Jan 2006 Location: tehachapi, CA Posts: 10,134	those 5 ft long power extensions couldnt be helping either.. :O

Oct 16, 2009, 12:36 AM	#25
rvincent 20,000 Screaming Watts! Join Date: Jul 2004 Location: Fontana, California, United States Posts: 17,615	No Ron you need to seal it up. it makes a big difference

Oct 16, 2009, 12:38 AM	#26
Ron101 Registered User Join Date: Jul 2007 Location: Brentwood, California Posts: 1,924	Thanks Bob.. I can do a pretty easy mod to close it up.. I'll take your advise I know Stu would say the say thing thanks bud

Oct 16, 2009, 12:40 AM	#27
rvincent 20,000 Screaming Watts! Join Date: Jul 2004 Location: Fontana, California, United States Posts: 17,615	Hey we're Scooter Jocks We watch each other's back

Oct 16, 2009, 01:10 AM	#28
Ron101 Registered User Join Date: Jul 2007 Location: Brentwood, California Posts: 1,924	I just found 5 oz to shave.. I'm dropping to one big air tank for brakes and retracts ( I have two now).. tossing one RX pack and regulator.. I used those heavy extension locks.. I'll use fishing line.. if I can find 2 more oz.. I'll be back to my starting weight of 17 lbs 9 oz I'll find those 2oz it may sound crazy to drop one 2s 1350 pack.. but after four flights I take out 150 mah out of eash... forget that it's gone I may lose the brake servo too.. that would give me my original weight... do the one servo setup... for brakes and retracts.. which means I'll will have an extra channel then I could lose the servo reverser I have on the nose wheel.. Hell I'll be lighter than I was to start

Oct 16, 2009, 01:25 AM	#29
corsair nut 150mph 90mm JHH COUGAR 3.5KW:D Join Date: Jan 2006 Location: tehachapi, CA Posts: 10,134	not sure what you have planned, but id just cut the inner walls free from the rounded outside of the ducts about 3" up stream from the fan, then glue them together to a taper right in front of the fan, then cut your half circle for spinner clearance....

Oct 16, 2009, 01:28 AM	#30
rvincent 20,000 Screaming Watts! Join Date: Jul 2004 Location: Fontana, California, United States Posts: 17,615	?? Brent my ducts are 1/2 circles. There is now spinner relief in the center?