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RE: (Something Fast?) Delta Build Thread - 1/6/2008 9:20:19 PM   
combatpigg



Posts: 9828
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		Speedy, I guess cost is relative...I got champagne taste on a beer budget.
The most expensive engine I ever ran was / is a G&Z .061......way more costly than the Nalson FAI.
The second happiest day of my modeling career was when I first got that little engine, the happiest day will be when I get rid of it.
I have to admit that at some point the quest for speed with these high-strung engines stretches the definition of fun. Especially when the returns on your investment only add up to a 5% increase.
I like the way your plane is set up because you will be getting extreme speed with an engine that is user friendly.....plus using cheaper APC props is possible if yer careful.

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 9:42:06 PM   
Speedy-Gonzales


 

Posts: 279
Joined: 3/7/2004
From: Bryan, OH, USA
Status: offline 		Combatpigg, Love those flames. I had a little CS .061 RE that I hated. The small displacement engine for RC use is what has inspired many to convert to electrics. This is my new little electric that I picked up after getting totally frustrated with 1/2A RC. This is the RADICAL R/C Quickwing 20. It is a blast! Speedy

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< Message edited by Speedy-Gonzales -- 1/8/2008 12:38:03 AM >

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 10:56:04 PM   
Strykaas



Posts: 4107
Joined: 3/21/2003
From: Paris, FRANCE
Status: offline 		Nice . What is your setup on this one Speedy ?

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 11:05:57 PM   
combatpigg



Posts: 9828
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		That is a cool looking little bird! Looks like the fins swing with the elevons. So Radical RC is the same outfit with the Outlaw? I've never seen a high speed delta flown aerobatically with flat spins, etc.....sounds like great fun.

The evil temptation to switch to electric for speed is ever present. I haven't taken the time to review this thread to see if Mikes' delta has been electrified yet, but I would be "up for" doing the wingtip fin model with one of those silent engines.

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RE: (Something Fast?) Delta Build Thread - 1/7/2008 2:10:16 AM   
Speedy-Gonzales


 

Posts: 279
Joined: 3/7/2004
From: Bryan, OH, USA
Status: offline 		Radical RC is not affiliated with the"Outlaw" Here is my setup for the Quickwing 20 and yes the rudders swing with the elevons. This is getting off the subject of the Screamin Demon but I will proceed but not dwell in this area to any length out of respect for Mr. C.

Radical RC
Quickwing 20

HiMax Brushless HA2025-4100
Castle Creations Phoenix 25A ESC with BEC
Thunderpower 1320 mah lipo 2C
APC 4.1 x 4.1 prop

I bought this plane completely built and set up here on RCU. It is one hot little bird.
Merci très beaucoup! Speedy

< Message edited by Speedy-Gonzales -- 1/8/2008 12:36:01 AM >

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RE: (Something Fast?) Delta Build Thread - 1/7/2008 2:27:20 AM   
Speedy-Gonzales


 

Posts: 279
Joined: 3/7/2004
From: Bryan, OH, USA
Status: offline 		Combatpigg, I will stick with the carbon props. Can you imagine what could happen if you throw a blade at 24K? You run that risk with any prop but I don't like to increase the odds against me! I would consider a good quality wood prop say from Darrol Caddy or other reliable Q40 sources. Darrol is a great guy that has helped me a lot. Out of curiosity...what other props can you suggest for the Nelson Q40 beast? These engines do not run properly unless they can really unload. I would estimate that the Q40 will unload another 1500 to 2000k in the air. I think a pair of "Depends" undergarments will be in order for the first flights! Speedy

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RE: (Something Fast?) Delta Build Thread - 1/7/2008 2:48:45 AM   
combatpigg



Posts: 9828
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		I would stick with the carbon props too, but APC has Q-40 props. Sometimes the most expensive way to do this hobby is to try to do it cheaply.

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RE: (Something Fast?) Delta Build Thread - 1/7/2008 6:11:25 AM   
Mike Connor



Posts: 1384
Joined: 1/10/2002
From: Tulsa, OK, USA
Status: offline
quote:

ORIGINAL: combatpigg

I haven't taken the time to review this thread to see if Mikes' delta has been electrified yet, but I would be "up for" doing the wingtip fin model with one of those silent engines.

Several customers said they were going electric but I have not received any flight reports yet. I sold one to a guy that posted on page 9 of this thread talking about a 44,000 rpm electric setup. He just got it a few days ago so it will be awhile. I have already put together 4 and may just have to make it 5 so an electric Demon can be tested soon. I have no electric equipment so the initial investment would be high if real speed is wanted. A 44,000 rpm Demon would be really fast and sound cool I would think.

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RE: (Something Fast?) Delta Build Thread - 1/7/2008 11:30:44 PM   
Speedy-Gonzales


 

Posts: 279
Joined: 3/7/2004
From: Bryan, OH, USA
Status: offline 		Combatpigg, The APC Q40 props are what I am using. Should the Q40 turn out to be unmanagable I have a Nelson Q500 that will bolt right in. How convenient! Speedy

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RE: (Something Fast?) Delta Build Thread - 1/7/2008 11:39:20 PM   
Speedy-Gonzales


 

Posts: 279
Joined: 3/7/2004
From: Bryan, OH, USA
Status: offline 		Ah yes! The cost of modeling. Kind of like the guy that buys a Corvette and then gripes about the price of gas! If it were not for modeling I would be big and fat and lay on the couch and watch sports. Winter is for building and blabbing on the computer. Summer is for getting outside and tearing up the blue sky. My modeling addiction is priceless. I think this is one of the greatest hobbies you could have. It is stimulating both mentally and physically. Especially when it is your turn to mow and trim the field! Speedy

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RE: (Something Fast?) Delta Build Thread - 1/11/2008 2:44:18 AM   
iron eagel



Posts: 1268
Joined: 7/15/2004
From: Middleboro, MA, USA
Status: offline 		Mike,
As I told you as a reply to the post in the aerodynamics forum, you have got to look at that carbon fiber veil/balsa combination regarding looking at an airfoil well below 12%, in the 3-5% range for the rib size. As I mentioned I am using that on the build I am currently working on, and have considered it for the skin of you delta design also. Given the target speed I would like I think that adding stressed skin might be a consideration....

As I mentioned I am going for the 2 KW range for power and am thinking of the neu1509/1y motor, the cost here is the main issue just under 3 bills....
Then add a castle creations 125 amp controller another 200 or so, and I haven't even gotten to the batteries....
The weight of the motor controller and 6 cell would be roughly around a pound not all that bad, just trying to shoe horn it all in would be the issue. But you are talking a setup combo that could go as high as 2500 watts total with a rpm in the 60,000 range, yea pretty sick I know. But 220+ could be well within reach, not bad for a electric I think...

Regards,
Paul




< Message edited by iron eagel -- 1/11/2008 2:48:37 AM >

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RE: (Something Fast?) Delta Build Thread - 1/11/2008 2:46:22 AM   
iron eagel



Posts: 1268
Joined: 7/15/2004
From: Middleboro, MA, USA
Status: offline
quote:

ORIGINAL: Speedy-Gonzales

Ah yes! The cost of modeling. Kind of like the guy that buys a Corvette and then gripes about the price of gas! If it were not for modeling I would be big and fat and lay on the couch and watch sports. Winter is for building and blabbing on the computer. Summer is for getting outside and tearing up the blue sky. My modeling addiction is priceless. I think this is one of the greatest hobbies you could have. It is stimulating both mentally and physically. Especially when it is your turn to mow and trim the field! Speedy



I second that!
But lets leave out the mow and trimming the field part, seem like I was the only one doing that last year..
One of the drawbacks to being field chairman...

Paul

< Message edited by iron eagel -- 1/11/2008 4:22:37 AM >

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The Wrights never crashed, they only had hard landings. I 've had some hard landings myself. AMA EAA AOPA revver #185

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RE: (Something Fast?) Delta Build Thread - 1/11/2008 3:59:37 AM   
gooseF22


 

Posts: 663
Joined: 8/12/2006
From: Fort Wayne, IN, USA
Status: offline
quote:

ORIGINAL: Mike Connor


quote:

ORIGINAL: combatpigg

I haven't taken the time to review this thread to see if Mikes' delta has been electrified yet, but I would be "up for" doing the wingtip fin model with one of those silent engines.

Several customers said they were going electric but I have not received any flight reports yet. I sold one to a guy that posted on page 9 of this thread talking about a 44,000 rpm electric setup. He just got it a few days ago so it will be awhile. I have already put together 4 and may just have to make it 5 so an electric Demon can be tested soon. I have no electric equipment so the initial investment would be high if real speed is wanted. A 44,000 rpm Demon would be really fast and sound cool I would think.

Mike
Im going to test a new prop in the next week or so on a 6 cell A123 at 32,000 rpm. Im going to cut down a 7x5 to 5.75x5 on my bobcat. My numbers for that is 69oz thrust, Im guessing about 70 amps at 14 volts on my 2500KV medusa. thats first test.

Then Im going to add two cells to my 6 cell pack A123's to get 8 cells to up the rpm to over 40,000. With a 5x5, that is about 180mph and about 100oz thrust. I am sure I will have to probably back off to a 4.5 pitch, but will see. I will post my testing for you guys.

I just have to be careful because this motor is a speed 400 motor good for 400 watts going over 1000 watts, but its holding up well as long as I give it cooling time between passes. with the 6cell and the 5.5x4.5 it pushes the nitro .25 bobcat about 90. but thats a draggy plane. As long as I have over 60 oz thrust, it will get off the ground fine. For the deamon, I should be able to open the pitch and will shoot for about 70oz thrust and maybe we can hit 150mph overall. This is my first experiment with this. The A123's are a little more heavy, BUT I am getting over 30C from a 2300 cell at 2.3 volts under 70 amps load, and they get hot, but keep chuggin. So I have to figure out how to cool them, and how to keep the drag to an absolute minimum without giving up cooling. It uses a Castle 80.

I am certainly open to ideas on how to vent the cabin. I plan to open the front somehow, and probably bring the shroud back a long ways over the servo bay so that I can leave a large 1.4 opening for venting the heat. the controller and batteries give alot of heat off. but the batteries are ok upwards of 150 degrees. The controller becomes the limfac for heat.

Keep you all posted.

By the way I was a full scale speed freak. my personal maximum is over 1000 knots. but dont tell my girlfriend. I promised to reform my ways but the toys get faster $$$$.


the build is going a bit slow, but I hope to have it done by end of Jan or early feb.

< Message edited by gooseF22 -- 1/11/2008 4:04:36 AM >

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