RE: My first speed plane attempt now with video    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version


Lanier Prediator 500 (II) - RTF
Seller:  stuk_at_work
Details:   $150.00   |  6/6/2013   |  Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> RC Airplanes >> Extreme Speed Prop Planes >> RE: My first speed plane attempt now with video
Page: <<   < prev  1 2 [3]

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
RE: My first speed plane attempt now with video - 11/6/2011 12:06 AM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		On a five cell that would have to be on video, somethings going to break... (Don't stand any where near that thing when it starts to spin up, we're talking a remote release for the catapult type of thing.)

Well the next time out it will probably be on the 6X5.5 I had on it for the first flight and see how it does, it should be a bit more interesting with the timing setup. I know the flight time is not going to be all that long with the 3300 mah 30/C 3 cell but it should be fairly quick. I think any of your new versions should go along just fine I am intrigued to see the full on BWB one, that should be quite entertaining on a 4 cell. The enhanced structure has yet to prove it was worth the effort and time to build it. (Hopefully adding the carbon fiber rods to the elevons stiffened them enough.) The next one I build will have a bit more composites used for the wing skin rather than the plywood caps on the structure (that was a real PITA.)

Hide Signatures

(in reply to Mike Connor)
       Post #: 51

RE: My first speed plane attempt now with video - 11/7/2011 4:38 AM   
cutaway


 

Posts: 1009
Score: 125
Joined: 6/26/2007
Last Login: 3/6/2012
From: Lake Worth, FL, USA
Status: offline
quote:

ORIGINAL: iron eagel
Hopefully adding the carbon fiber rods to the elevons stiffened them enough.

Try a sheeted balsa stick frame with fused with carbon veil.


Hide Signatures

(in reply to iron eagel)
       Post #: 52

RE: My first speed plane attempt now with video - 11/7/2011 5:19 AM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		The elevons are stick built and I had thought about using the veil but opted for the carbon fiber rods embedded in the sheathing. I have used carbon fiber veil before and it works out rather well (perhaps I should have used that approach) but the goal with this build was to use as much wood as possible.
If your interested how this build came about read:
http://www.rcuniverse.com/forum/m_9212265/mpage_1/key_/tm.htm



Hide Signatures

(in reply to cutaway)
       Post #: 53

RE: My first speed plane attempt now with video - 11/7/2011 3:37 PM   
cutaway


 

Posts: 1009
Score: 125
Joined: 6/26/2007
Last Login: 3/6/2012
From: Lake Worth, FL, USA
Status: offline 		A triangulated stick frame, with 1/32" balsa sheeting, done with dope silkspan/silk/tissue yields a very rigid and light structure too. Actually, just an open stick frame in the 1/4" thickness range for control surfaces that silkspan/tissue covered winds up quite rigid. If you use a covering material where the covering gets fused with the wood and becomes a composite structure (ex. doped finishes over wood), then all sorts of new structural options present themselves when the covering can be relied on as a structural member.

Recently I built a series of .60 size Ugly Stick tails with various internal structure and covering methods to see just how minimal one could be made and still be stiff and strong enough to do the job. The ones with 1/32" sheeting over 1/8" stick frame, covered with OOO light weight silkspan I'd intended for electric versions turned out to be plenty strong and rigid enough for a glow version, and they were vastly lighter than the Jensen plan original Phil Kraft spec versions turned out to be.

Hide Signatures

(in reply to iron eagel)
       Post #: 54

RE: My first speed plane attempt now with video - 11/10/2011 2:41 AM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		Your right with the materials available today there are a lot of options in doing a stressed skin type of build.

Hide Signatures

(in reply to cutaway)
       Post #: 55

RE: My first speed plane attempt now with video - 6/11/2012 2:31 PM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		Got a flight in with the 5.25 X 6.25 APC prop on it yesterday at our clubs open house in a demo flight. Got some good data from the flight, clearly it needs to be on a four cell before I'll get any real performance out of the plane but good flight test. The landing was a bit rough and she needs a nose job before any further flights, the intake/motor mount and cowl was destroyed. But like I said we got some good data from the flight adn the repair isn't that big of a deal I wanted to change the intake a bit anyway.
http://www.youtube.com/watch?v=SjSOl9bjzb0

Hide Signatures

(in reply to iron eagel)
       Post #: 56

RE: My first speed plane attempt now with video - 6/11/2012 5:40 PM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		Just to rub salt into the wound here is the plane that flew after mine.
http://www.youtube.com/watch?v=M8Up_qACtWI

Hide Signatures

(in reply to iron eagel)
       Post #: 57

RE: My first speed plane attempt now with video - 6/11/2012 8:34 PM   
Mike Connor



Posts: 2025
Score: 100
Joined: 1/10/2002
Last Login: 10/9/2012
From: Tulsa, OK, USA
Status: offline 		Yep, a 4S would liven it up some. Have you had your hands on the controls while in flight yet?

Hide Signatures

(in reply to iron eagel)
       Post #: 58

RE: My first speed plane attempt now with video - 6/12/2012 3:21 AM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		Like I told you in my email, I hadn't flown it yet, as a matter of fact the speaker was busting me about it during his narrative...
But I knew that crosswind wasn't going to be a lot of fun, even Lee had a problem with it I would have trashed it for sure.
I was going to give it a shot later after the open house closed down and the wind died down.

Like I said before, she needs a bit of a nose job, all I did was pop of the prop adapter and undo the esc and here is how it looked.
I got the nose cut off and went to take a picture but the battery in my camera decided to head south so no pics of the repair yet. I really want to get it flight ready for the weekend.

Attachments
Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to Mike Connor)
       Post #: 59

RE: My first speed plane attempt now with video - 6/23/2012 9:03 PM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		As usual it took a bit longer than predicted but here is the end results of her nose job.
The first picture shows her after all of the damaged portions had been removed. The second shot shows the new motor mount as well as the new cowl mount ring. To make it much easier to tighten up the prop adapter the cowl was made removable and is installed after the prop adapter is in place and tightened. The front diameter of the cowl was reduced about 7/16ths of inch from the original cowl, testing had shown that I could reduce the intake size and still (I hope) have adequate cooling air for the power system.
I hope that by reducing the size of the cowl it should allow for a bit better performance than I have seen with the smaller diameter props that I used since the first flight. Right now the plane is to try it one more time on the three cell just to see how much (if any) the change to the cowl and intake effect the flight performance. Then we will see exactly what a four cell will do for her.
I think she looks a bit better after her nose job anyhow, the cowl was never quite right.

Edit to add:
A shot from the front (the business end )

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to iron eagel)
       Post #: 60

RE: My first speed plane attempt now with video - 6/23/2012 9:33 PM   
combatpigg



Posts: 16930
Score: 381
Joined: 11/22/2003
Last Login: 6/20/2013
From: arlington, WA, USA
Status: offline 		Looks as good as new!
I won't compromise my heading when it comes to landings [or take offs]. I'd rather land the plane a ways down range, but directly into the wind than mess with any cross winds.


_____________________________

Blatantly corrupt umpiring at Yankee Stadium is an American tradition
It''s just part of the game.

Hide Signatures

(in reply to iron eagel)
       Post #: 61

RE: My first speed plane attempt now with video - 6/24/2012 5:36 PM   
Mike Connor



Posts: 2025
Score: 100
Joined: 1/10/2002
Last Login: 10/9/2012
From: Tulsa, OK, USA
Status: offline 		If we ever figured up how much flight time we got vs build and fix time, it would probably be depressing.

Hide Signatures

(in reply to combatpigg)
       Post #: 62

RE: My first speed plane attempt now with video - 6/24/2012 6:39 PM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		Thanks Cp, I hope it's better than new as far as performance. I am really looking to see a good jump in speed from the modifications. I am with you as far as landing in a cross wind but with the crowd present that day doing that type of approach was out of the question.

Your right Mike that's why I refuse to even think about it. I prefer to focus more on the flight time and the planes performance.
I looked at this repair more as an opportunity to improve the performance it hurts less that way.

Hide Signatures

(in reply to combatpigg)
       Post #: 63

RE: My first speed plane attempt now with video - 6/11/2013 5:34 AM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		Finally got another flight on this thing while the cowl helped it is obvious that a five inch prop will not work on this airframe using a three cell. While there was some small improvement in speed the data logger showed that the prop is presenting very little load to the motor it is a 2850 kv motor and with the 5.25 X6.35 it was spinning up to 27,000 rpm and not drawing much over 60 amps.

Hide Signatures

(in reply to iron eagel)
       Post #: 64

RE: My first speed plane attempt now with video - 6/11/2013 6:03 AM   
combatpigg



Posts: 16930
Score: 381
Joined: 11/22/2003
Last Login: 6/20/2013
From: arlington, WA, USA
Status: offline 		There must be some "turn key" combos out there that are just perfect for this plane..?



_____________________________

Blatantly corrupt umpiring at Yankee Stadium is an American tradition
It''s just part of the game.

Hide Signatures

(in reply to iron eagel)
       Post #: 65

RE: My first speed plane attempt now with video - 6/11/2013 4:57 PM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline 		There must be.
I knew that using a high Kv motor was going to be a bit problematic as far as getting the right prop and battery combo. So it going to take a bit of trial and error but from what I am seeing in the data it doesn't look like anything under a 6 inch prop is going to work with the three cell.

Hide Signatures

(in reply to combatpigg)
       Post #: 66

RE: My first speed plane attempt now with video - 6/11/2013 5:47 PM   
combatpigg



Posts: 16930
Score: 381
Joined: 11/22/2003
Last Login: 6/20/2013
From: arlington, WA, USA
Status: offline 		If you run out of options based on cargo area..then what..?
Nelson .15 RE... 6x6 prop...?


_____________________________

Blatantly corrupt umpiring at Yankee Stadium is an American tradition
It''s just part of the game.

Hide Signatures

(in reply to iron eagel)
       Post #: 67

RE: My first speed plane attempt now with video - 6/11/2013 7:00 PM   
iron eagel



Posts: 2765
Score: 118
Joined: 7/15/2004
Last Login: 6/19/2013
From: Middleboro, MA, USA
Status: offline
I think you Nelson 40 would be a far better option. lol
IF I really want to do a strap a motor to the wing thing I could see if I could strap that os .91 df motor to the front of it.
As far as cargo area this thing is set up so a four or five cell will actually fit the flight time would only be about three minutes on any five cell I put into it. With this motor this motor you can spin it up to 25krpm on a three cell with the right prop actually pulling and loading the motor. If you use a four or five cell the rpm would be 34k rpm or 42 K rpm respectively, although getting a prop that will hold together may be an issue. There are a couple of threads on another forum where the German speed cup guys have threads on the carbon props they are casting describing the process and materials and this is probably be the route I would have to go to use a five cell in this beast. Even with a four cell I may be in the range where things start to come apart (the blades of the prop specifically).
With a 5 inch or so diameter using a three cell I figure I need something like a 8 or ten pitch prop. The only question is would that give it that bit more thrust that it need so the prop can actually hock up. Using thrust calc the 5.25 X 6.25 should work with a four cell but the pitch speed is something like 260 mph an at this point I want to see at least a couple of flights over 160 before I go for that much speed. Keep in mind Mikes plane using this planeform suffered full wing flutter at 130 or 140 mph, before I push it really hard I want to be sure the structural issues are really resolved. I am going to try another flight using a 6X5.5 and get a video so I can see how fast it actually is going. If it is anything over 160 then I will go with the four cell and see what happens, even if it is making confetti Like Mike did.
As far as electrics the real option would be a NEU motor but they are a bit pricey just to use as an experiment, and not something I could run out and buy at this moment.
Keep in mind I built this plane just to see if this design was capable of flight faster than 140 mph being built of primary wood with a wing that was only 3/8 of an inch thick with a 43 inch span.

Hide Signatures

(in reply to combatpigg)
       Post #: 68

Page:   <<   < prev  1 2 [3]
All Forums >> RC Airplanes >> Extreme Speed Prop Planes >> RE: My first speed plane attempt now with video
Page: <<   < prev  1 2 [3]





Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


0.781RCU1