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Old Jan 11, 2009, 06:59 PM
Vintage Flyer
Indiana
Joined Jan 2005
1,674 Posts
Quote:
Originally Posted by dag214
Hey Ed,
It is funny after running the first test my entire bench had moved about 3" with just this one motor. I then used C-blocks to weight down the bench. In the second video after throwing the rag into the prop 5 times I knew it was not going to hurt it, then I just decided to grab the closet thing to me (a 48" steel ruler) and cram it into the prop, the prop lost 3/4" of wood, but the shafting, bearing, and the bearing holders held up great. And this Hacker is one power house . I really have only one last test to do and that is measure the thrust, I have been told by an engineer and also read that if I take a basic floor fan and just move some air thru the prop it will keep it from being stalled, I should get a close to accurate thrust measurement that way.

Thanks, DAG
I was just thinking of a scenario where you are testing and all six engines blow your garage wall down! LOL!
Explain that one to your insurance agent ! LOL!
I can just hear your agent now!!!

Uhhhh Dag, your insured as a single family dwelling, not an aircraft factory and aircraft engine testing facility! ROTFLMBO!!!
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Old Jan 11, 2009, 07:03 PM
AMA 670207
Rudderman98's Avatar
United States, WA, Sumner
Joined Oct 2000
2,761 Posts
Just absolutely fantastic Dag!

Perry
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Old Jan 11, 2009, 08:04 PM
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Hepdog's Avatar
Stonewall, MB, Can
Joined Jul 2004
2,815 Posts
Dag ever time I listen to your tests I could swear I hear some mid power growls at various power settings. When I hear growls I immediatly think bearings. While your setup may survive sudden impacts like rags etc, a bearing piling up may be more terminal.

Have you considered doing any long term power testing to make sure the bearings aren't wearing out? Also, I take it the test rig (and all parts) are not going into the actual airplane?

Pretty cool stuff.
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Old Jan 11, 2009, 08:55 PM
Mine flies like a Lawn Dart !!
owenaa's Avatar
Hilliard, FL
Joined Aug 2008
12 Posts
Props

After watching the prop go "invisible", you might consider painting the tips front and back for your and the flight crew's safety... but you've probably already got that in the paint scheme...

Al
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Old Jan 11, 2009, 08:57 PM
War Eagle!
sneasle's Avatar
United States, AL, Huntsville
Joined Sep 2006
2,809 Posts
ya, probably a good idea.

I was impressed how much damage those prop tips took.
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Old Jan 11, 2009, 08:57 PM
Bi-Planes
Tim Farrar's Avatar
Houston Texas
Joined Apr 2006
1,589 Posts
Awsome test's Dag !!

You are really putting it through some hard times !!

I started both video's at once so I could hear what two of them sound like ...lol lol lol...

Cool !!!

Seeya, Tim
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Old Jan 11, 2009, 10:17 PM
Use the 4S Luke
feathermerchant's Avatar
USA, TX, Euless
Joined Aug 2003
9,318 Posts
So FWIW I flew my 87" SHP several times today and finally measured the power. 85A and 3600W This is on 12S
It pulls the 17lb SHP straight up easy. Motor gets warm but not really hot.
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Old Jan 12, 2009, 01:20 AM
I fly, therefore, I crash!!!
SteveT.'s Avatar
San Jose, CA
Joined Jan 2008
24,913 Posts
Hi dag....

Un-cotton-picken believable!!!

So...when you get done with this one, I`ll loan you my plans for a 10 foot wingspan (fuselage also about 10 feet) Constellation (or super connie if you stretch it 2 feet over the wing) and you can enlarge them and build a huge Connie!! Of course after this project, it wouldn`t even be a challenge...

SteveT
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Old Jan 12, 2009, 01:26 AM
Registered User
Joined Sep 2004
61 Posts
Mr. Dag,

This project is going great. Like me, alot of other people are really looking forward to see this in air and looks like you are going to provide it pretty soon.

Couple days ago I gave a link to this post and a picture of what you have accopmlished in another forum. It is another RC Model Forum and it is in Turkish. I wanted to share this with my Turkish Modeller Friends.

Now a moderator is asking me if i have your permission to have these links.

May i kindly ask your permission to keep them or should i delete my posts.

Here is a link of the thread i shared your link and some pictures.

http://www.modelci.net/forum/viewthread.php?tid=5656

Thank you very much for providing such a refference to the world.
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Old Jan 12, 2009, 04:21 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
5,643 Posts
Quote:
Originally Posted by encan
Mr. Dag,

This project is going great. Like me, alot of other people are really looking forward to see this in air and looks like you are going to provide it pretty soon.

Couple days ago I gave a link to this post and a picture of what you have accopmlished in another forum. It is another RC Model Forum and it is in Turkish. I wanted to share this with my Turkish Modeller Friends.

Now a moderator is asking me if i have your permission to have these links.

May i kindly ask your permission to keep them or should i delete my posts.

Here is a link of the thread i shared your link and some pictures.

http://www.modelci.net/forum/viewthread.php?tid=5656

Thank you very much for providing such a refference to the world.
Yes you have permission to show any of my pics or designs. Share with anyone who loves aviation, anyone who may think, wow that is just to much to design, build, then fly, but what the heck I will try anyway.

Thanks, and no MR. DAG, just DAG. MR. DAG sounds like a guy that might be flying around in unmarked black heli's, Code named MR. DAG .

Thanks, DAG
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Old Jan 12, 2009, 04:26 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
5,643 Posts
Quote:
Originally Posted by Hepdog
Dag ever time I listen to your tests I could swear I hear some mid power growls at various power settings. When I hear growls I immediatly think bearings. While your setup may survive sudden impacts like rags etc, a bearing piling up may be more terminal.

Have you considered doing any long term power testing to make sure the bearings aren't wearing out? Also, I take it the test rig (and all parts) are not going into the actual airplane?

Pretty cool stuff.
You know it's funny. I thought I was hearing the same thing, but what I think is going on is the motor sound being transmitted thru the shaft and the shaft producing some kind of a noise. I am using some fairly big Boca ceramic bearings and they still feel great. But I am going to run a test later right at the point that sound is the loudest and run a full cycle from the batteries. About 24 minutes worth at 55% power, that is where I here the noise the most.

Thanks, DAG
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Old Jan 12, 2009, 04:48 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
5,643 Posts
Quote:
Originally Posted by Draknkep
Hi dag....

Un-cotton-picken believable!!!

So...when you get done with this one, I`ll loan you my plans for a 10 foot wingspan (fuselage also about 10 feet) Constellation (or super connie if you stretch it 2 feet over the wing) and you can enlarge them and build a huge Connie!! Of course after this project, it wouldn`t even be a challenge...

SteveT
If I ever did a Connie she would be 300" .

My next plane was going to be either my 68% Pitts S-1 design, or my 38% T-28 design, but now with these electrics who knows. It comes down to (for me) turning a scale looking prop. When I first started the fact finding mission of getting the right motor I had someone actually try to convince me to try 17" APC on this B-36D, this guy was not into listening to my needs at all. A 285" Lancaster would be doable, a 285" B-24J also doable, maybe a EDF B-52, or B-47.

Thanks, DAG
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Last edited by dag214; Jan 12, 2009 at 05:09 AM.
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Old Jan 12, 2009, 07:42 AM
HAL... Open the damn doors!
jfetter's Avatar
Miramar, Florida
Joined Jul 2007
7,936 Posts
Quote:
Originally Posted by Hepdog
Dag ever time I listen to your tests I could swear I hear some mid power growls at various power settings. When I hear growls I immediatly think bearings. While your setup may survive sudden impacts like rags etc, a bearing piling up may be more terminal.

Have you considered doing any long term power testing to make sure the bearings aren't wearing out? Also, I take it the test rig (and all parts) are not going into the actual airplane?

Pretty cool stuff.
I hear harmonics but that doesn't necessarily mean bad, everything resonates at some frequency. All of my electrics when throttling up or down go though their various harmonic points as the RPM's change. I worry about it when it's with at full throttle or the position I normally fly in...

Jack
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Old Jan 12, 2009, 08:30 AM
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coptercptn's Avatar
United States, IL, Island Lake
Joined Dec 2008
318 Posts
Just curious..do you have any kind of watt meter hooked up to see how much power you are using? And, how many MAH did you put back into the batteries after the test?
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Old Jan 12, 2009, 10:07 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
5,643 Posts
Quote:
Originally Posted by coptercptn
Just curious..do you have any kind of watt meter hooked up to see how much power you are using? And, how many MAH did you put back into the batteries after the test?
No watt meter, know where I can get one???

I will be testing to night the motor with the 20-14 running for 10 minutes at 55% power to test the bearings. And I will then check to see how many Mah the batteries used.

Thanks, DAG
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