RE: KMP / YT FW-190 Build Thread  
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RE: KMP / YT FW-190 Build Thread - 2/1/2008 4:19:07 AM   
mike-rc


 

Posts: 63
Joined: 2/13/2004
From: Port Washington, NY, USA
Status: offline 		Hello Al,
I am going to use teh BCMA 26 engine I was going to use in the FW. I think it will work out better than vice versa. I will need to get a 2 blade spinner. I checked the Amp draw with the 15.75 x 13 3 blade and only got about 55A and less than 1800W. With a 19 x 12 2 blade I got 67A and about 2200W. I will call Paul tomorrow.
Have you followed any threads for the Monocoupe?
Thanks, Mike

(in reply to mobyal)
       Post #: 326

RE: KMP / YT FW-190 Build Thread - 2/1/2008 6:43:53 PM   
NoFlaps


 

Posts: 763
Joined: 6/25/2004
From: Louisville, KY, USA
Status: offline 		So, I have to ask...and hope I get a response from at least 3 of you.
How much do your planes weigh, and have you figured out what that wing loading comes to ?
Is the airfoil particulary fatm as a means to alleviate the high wing-loading ?

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Any landing you can walk away from is a good one.

(in reply to mike-rc)
       Post #: 327

RE: KMP / YT FW-190 Build Thread - 2/2/2008 5:24:42 PM   
Randyt26


 

Posts: 14
Joined: 1/21/2005
From: Red Bluff, CA, USA
Status: offline 		the Video of the electric conversion looks to fly reallly well so i dont think its overweight by any means. I am impressed with this arf you pay more but I believe its worth it.
Randy

(in reply to NoFlaps)
       Post #: 328

RE: KMP / YT FW-190 Build Thread - 2/2/2008 10:25:49 PM   
dvs1



Posts: 163
Joined: 4/25/2005
From: Kanab, UT, USA
Status: offline 		Seeing more progress from you guys helped get me more motivated this weekend. I ended up doing a little more
on the drop tank and pylon. It's getting there, just have to finish with the standoffs and tank mounts. Then add a few rivots
and panel lines to the pylon.


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(in reply to Randyt26)
       Post #: 329

RE: KMP / YT FW-190 Build Thread - 2/2/2008 10:34:15 PM   
mobyal


 

Posts: 701
Joined: 1/2/2006
From: Lexington, VA, USA
Status: offline
quote:

ORIGINAL: NoFlaps

So, I have to ask...and hope I get a response from at least 3 of you.
How much do your planes weigh, and have you figured out what that wing loading comes to ?
Is the airfoil particulary fatm as a means to alleviate the high wing-loading ?


NoFlaps --
I don't know what mine'll weigh. I'll be interested to hear what others have to say.
Was your question prompted by the article on the KMP Typhoon in the latest MAN? Just got my copy today and read the article over lunch. (Left it in my shop so I'm working from memory here.) The reviewer -- one of the Ronges -- initially had to add seven and a half pounds of lead to get it to balance! After he went back and put the largest/heaviest engine in it he could fit, he still had to add a lot of lead -- was it 4+ pounds? -- to balance it. The whole thing came out at 19+ pounds if i remember correctly. He does say it flies all right and does mention the Typhoon's airfoil as a help. But states clearly that it's not for a beginner. Either assembling or flying. Takes a swipe or two at the instructions, too.
The Taffy doesn't have much of a nose moment, but then the FW "A"s don't either.
Still hope to begin on mine next week. Engine shipped from Tower, so once I find an aluminum mount for it, I'll have everything.
Al



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MobyAl

(in reply to NoFlaps)
       Post #: 330

RE: KMP / YT FW-190 Build Thread - 2/3/2008 11:24:15 AM   
LDM


 

Posts: 4843
Joined: 5/29/2003
From: Denver, PA,
Status: offline 		Moby ,you read my mind , I just got that same issues of Man and was thinking wow 73" span , 19.2 pound model and they claim that its flys good ???and you wonder why some warbirds have a bad reputation . I look at it like this , when they build the real plane , was it designed to carry 25% or more in dead weight for simple CG balance ??? no way in He....ll .
To me that is not a fun inticeing warbird to buy , build and fly .
I would pull that entire thing apart and move every possible servos forward --as far forward as possible , move the EI battery to the firewall and more the radio battery under the fule tank and add the largest battery possible , go to light weight wheels .
The FW190 , the seafury , the hellcats ect all have the same tendency to be tail heavy , so every possible move forward must be made in the assembly/ build process .

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LDM

(in reply to mobyal)
       Post #: 331

RE: KMP / YT FW-190 Build Thread - 2/3/2008 5:22:21 PM   
nicostoffi



Posts: 313
Joined: 4/11/2006
From: Moerfelden, GERMANY
Status: offline 		Hello,

now I've finished my FW 190.
Building time ca. 14 days, only the engine doesn't mounted.
Weight over all, with servos, accu, Glowaccu, without engine - 5,1 kg = 11,22 p.

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< Message edited by nicostoffi -- 2/3/2008 5:23:27 PM >

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(in reply to LDM)
       Post #: 332

RE: KMP / YT FW-190 Build Thread - 2/3/2008 6:12:55 PM   
alanc


 

Posts: 606
Joined: 12/15/2003
From: manchester, AE, UNITED KINGDOM
Status: online 		the full size tiffy was indeed designed to carry dead weight---in the form of the napier sabre, 1 ton of deadweight, we had a choice, which was discussed in open forum in the UK, go for scale, and ballast, or stretch the front end, not one vote for the latter, it does indeed fly well, just go try it, it was always going to be the one that had lots of ballast, friend of mine once owned a DAennis Bryant one, about 63", i think, it weighed nothing---until you tried to balance it for flight, it needed 3lb up front, it flew superbly, as this one will, BUT, learnt to use flaps, the model is designed to use them on landing, we chose the tiff, for its superb thick wing, and huge flaps, its a winner, go fly it the FW and bearcat also need ballast, not as much though, these too are flying quite happily, they are well designed aerodynamically, trust us


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ALAN, UK sales and promotions, YT INTERNATIONAL,

(in reply to LDM)
       Post #: 333

RE: KMP / YT FW-190 Build Thread - 2/3/2008 8:47:28 PM   
LDM


 

Posts: 4843
Joined: 5/29/2003
From: Denver, PA,
Status: offline 		Alan your misunderstanding me , my critisum is that of the builder , everyone knows that every short nose warbird will be tail heavy .He even makes the comment that the "wheels seem heavy " and not having the model for my own I would imagine that the wheels are near/on are slighty ahead of the CG considering they retract towards the rear , so useing lighter wheels (that can be made to look scale ) is one simple option to shed weight . IN addition his choice of power could have been advoided if he simply checked the tower website , you can get 3lbs 3 oz of engine turning a standard 18/10 prop out of the FugiBT 32 EI , if i am not mistaken he was one engine smaller .
Also if the CG was show at /on or near the wing servos , then do the work and move the servos forward .

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LDM

(in reply to alanc)
       Post #: 334

RE: KMP / YT FW-190 Build Thread - 2/3/2008 9:17:16 PM   
Redback



Posts: 501
Joined: 8/27/2004
From: GraftonNew South Wales, AUSTRALIA
Status: offline 		After much deliberation finally got mine balanced at the recommended 130mm back position (wheels up). This took 800gms of lead (about 1.5lbs) plus a large battery mounted in the cowl on a very substantial steel bracket (which also carries the ballast.

Yet to check the final weight but based on a previous check expect it to be about 8Kgm. Considered moving the servos foward when assembling but given that these are close to the CG anyway didn't think it would make much difference.

The supplied retracts were very sluggish in operation until I replaced the suppied coupler with a Robart one. The one with the kit has an O ring in it which seems to constrict the airflow when the connector is tightened. Once I changed it out the retracts are now very positive.

Just need the rain to stop now!


Terry

(in reply to LDM)
       Post #: 335

RE: KMP / YT FW-190 Build Thread - 2/3/2008 9:26:59 PM   
alanc


 

Posts: 606
Joined: 12/15/2003
From: manchester, AE, UNITED KINGDOM
Status: online 		also check if your retracts are brass bushed, or nylon, brass bushes are available from KMP These bushes are on the pivot pins that run in the slider slots

< Message edited by alanc -- 2/3/2008 9:27:55 PM >


_____________________________

ALAN, UK sales and promotions, YT INTERNATIONAL,

(in reply to Redback)
       Post #: 336

RE: KMP / YT FW-190 Build Thread - 2/4/2008 1:17:55 AM   
mike-rc


 

Posts: 63
Joined: 2/13/2004
From: Port Washington, NY, USA
Status: offline 		My plane weighs just over 17lbs with the 2 5S 4900mah batteries in it. It balances at 150mm back from where the wing meets the fuse. If you extend the leading edges of the wings to the centerline, that point is about 20mm back from the front of the wing where it meets the fuse. I believe this is where the the CG should be as it is on the main spar. I would like to here from someone who flew it as to where their CG is. Flying this plane tail heavy on the first flight would not be enjoyable!
Mike

(in reply to NoFlaps)
       Post #: 337

RE: KMP / YT FW-190 Build Thread - 2/4/2008 3:05:06 AM   
Redback



Posts: 501
Joined: 8/27/2004
From: GraftonNew South Wales, AUSTRALIA
Status: offline 		Mike,

Interested in your view of where the CG should be as I was thinking along the same lines, although at the moment I have gone with 130mm back from the wing/fuse join. Moving it back 20mm would lose me best part of 1lb, which would make mine about the same weight as yours.

Would sure be good to hear from someone who has flown one, I share your concerns on a tail heavy 1st flight.

Terry

(in reply to mike-rc)
       Post #: 338

RE: KMP / YT FW-190 Build Thread - 2/4/2008 12:16:31 PM   
Sarah



Posts: 161
Joined: 1/7/2003
From: Bristol, UNITED KINGDOM
Status: