RE: Building Nakajima B5n2 <Kate>  
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All Forums >> RC Airplanes >> Scratch Building, Aircraft Design, 3D/CAD >> RE: Building Nakajima B5n2 <Kate>
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RE: Building Nakajima B5n2 <Kate> - 5/28/2008 11:49:23 PM   
Baldeagle


 

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From: Lakeside, AZ, USA
Status: offline 		Jim sorry it took so long. We had a busy weekend. I think with what I have added to the 3 view you shouldn't have any problems. The ribs came out pretty good . The fush formers were fine but the notches at 45 deg were off. You could cut them out after the top, bottom and 90 deg stringers are in place. It has been windy ,cold and either snowing or raining.

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RE: Building Nakajima B5n2 <Kate> - 5/28/2008 11:53:34 PM   
Baldeagle


 

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Status: offline 		Forgot the pic.

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RE: Building Nakajima B5n2 <Kate> - 5/29/2008 2:37:07 PM   
JIMARRINGTON


 

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From: NEW BOSTON, TX, USA
Status: offline 		That last pic is a funny looking Kate. Do you have a model of all WWII Imperial warplanes? That last one is a Hien isn't it.

Plans look great. I would like a copy. Pm me with the details.

Thanks
Jim

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RE: Building Nakajima B5n2 <Kate> - 5/29/2008 4:33:59 PM   
Baldeagle


 

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Status: offline 		Yep that is my Ki 61 Toni. It has been done for a couple years. Just got a motor for it. I had a mayjor screw up. When I built the wing I didn't have enough diheaderal. So I had to cut the wing into. to fix it. It is almost ready to go. Sent you a pm. Rich

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RE: Building Nakajima B5n2 <Kate> - 6/8/2008 5:16:39 AM   
Baldeagle


 

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Status: offline 		Jim did you recieve the plans yet?

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RE: Building Nakajima B5n2 <Kate> - 6/9/2008 2:38:18 PM   
JIMARRINGTON


 

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Status: offline 		Rich,
Sent you a PM

Jim

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RE: Building Nakajima B5n2 <Kate> - 6/14/2008 2:34:50 PM   
JIMARRINGTON


 

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Status: offline 		Got the plans out finally and looked at them last night. Boy this thing has a huge wing! I think I may try the Val first. Dont think I want to mess with retracts yet. Since the Val has such a small cowl, what do you think of using a converted Ryobi 31cc weedeater motor in it. It has both a rear carb and exhaust. Should swing an 18x8 around 7300 to 7500 rpm. Do you think that would be enough power for the Val. With that small cowl and huge wing, the full size Val couldn't have had a very big engine to start with. I have a newly converted Ryobi that I hope to test fly in a 4 star 120 this weekend. This Ryobi has had a few mods to up the power. A larger carb, a gapless pinned ring, a modified reed valve, and electronic ignition.

Jim

BTW did you get the check yet?

< Message edited by JIMARRINGTON -- 6/14/2008 2:35:22 PM >

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RE: Building Nakajima B5n2 <Kate> - 6/14/2008 3:03:49 PM   
Baldeagle


 

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Status: offline 		Jim I must have miss it somewhere . What size is your Val ? It sounds like enough power for an 83 in ws . Still haven't flowen mine yet. I have 3 Grandkids playing Little League all sizes from T ball , Minors and Seniors League. That keeps me pretty busy.
Wheel pants are a lot more work than retacts at least I think so. I want to fly the Kate again so bad I can tast it. It is sooooo easy to fly. I recieved your check yesterday. If you have questions just hollor. Got to go . We have a baseball turnament today. Rich

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RE: Building Nakajima B5n2 <Kate> - 6/14/2008 3:22:23 PM   
JIMARRINGTON


 

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Status: offline 		Rich,

I have the same electric plans for the Val that you built yours from. Plan to enlarge to 85" just like yours. As a matter of fact, I already had them printed before I found your thread on it. I can understand your schedule. During the Summer my building time gets cut to a minimum. I still have a 6 yr old in the house to keep me busy. Plus flying on the weekends and endless yardwork. In the winter, I can get out to the workshop a lot earlier in the evening and get more done. I currently have an almost framed up Dynaflite SE5a. And a half restored Midwest 120 Texan. The fuse has been mostly detailed glassed and painted. My first attempt at panel lines and rivets. I must admit, that it turned out pretty well. I had a thread going on it on the warbirds forum but have not posted in a couple of months as other projects got in the way. My plan is to finish the SE5. Then finish the Texan/SNJ acutally its painted up as a Navy SNJ-5. Then hopefully start on a new scratchbuild. I have found that I am most happy building from scratch. I just enjoy the challenge and the build. And one more challenge I have is finding a place to store all my airplanes. They seem to keep getting bigger and bigger. I started out building 36" Peter Rake electric biplanes. Then moved up to 40 size warbirds. I have a FW190 that I built from plans from AMA. Great flyer. And a Wing Mfg P-40. From those I went to a 71 inch GP Tiger Moth and a 4star 120. Both the FW and the P-40 won Model of the Year awards in our club. So I cant seem to want to part with any of them. BTW 2 of my electric biplanes were featured in British magazines and were the prototypes for now available laser cut kits. So, I cant seem to get rid of any of them. And I cant hardly turn around now.

Jim

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RE: Building Nakajima B5n2 <Kate> - 6/14/2008 4:08:27 PM   
JIMARRINGTON


 

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Status: offline 		Just layed the Ryobi out on top of the Val plans and although it would mean moving the firewall back an inch or so, it will fit nicely in the cowl inverted. Will only have about a half inch of the head sticking out the bottom. The plug wire could be run out of the air intake from the airplane. So if it is strong enough it might be a good match for this airplane. With an 18x8 prop it should put out between 16 and 17 lbs of thrust conservatively. Slightly less than 1 to 1 thrust to weight ratio but still in good range for a slower flying bomber with a light wing loading. Let me know what you think.

Jim

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RE: Building Nakajima B5n2 <Kate> - 6/14/2008 4:22:08 PM   
JIMARRINGTON


 

Posts: 590
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Status: offline 		Just ran some numbers on Motocalc. Eventhough it is used to pick out electric motors, if you pick a motor and battery that gives you the rpms of the gas motor you will be using, it will get you into the ballpark as far as flight characteristics and props. I dont know what the wing area of the 85" Val is but I estimated at 1200 sqin. I know about how many rpm the Ryobi will turn an 18x8 prop. And you said your model wieghed in around 18-18.5 lbs. Motocalc predicts that the 18x8 prop pitch speed will be too little to give enough flying speed. However a 17x10 which will yield the same rpm will fly the airplane just right.

Jim

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RE: Building Nakajima B5n2 <Kate> - 6/15/2008 4:46:22 AM   
Baldeagle


 

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From: Lakeside, AZ, USA
Status: offline 		Jim The Kate does have a LARGE wing so does the Val. It looks like a 1/4 scale wing with an 1/8 scale fushlage. I remember when I went from 40 size planes to a 60 size Jenson ugly stick . I thought it was a monster. I am like you I am running out of room. I can't get rid of mine either. They became part of me I guess. It is a neet fealing to take a bunch of sticks and make it look like a real plane. There is only one other guy up here besides myself that scratch build. The rest just fly ARFs. I have a couple of them but there is something missing when I take them out to fly. Pride I guess.
When I built the Kate I used 3/32 sheeting for the fush. I normally use 1/8 balsa. I think it save quite a bit of weight , esp in the tail area. I think the Kate would fly with a 90 fs.
I have an 18-10 on the Val with the MVVS 35. It should work out fine.
Still wanting to convert my Mag 180 two stroke to gas. I think I need to change the connecting rod bushing to a rollor bgr. I just hate the mess the glow two strokes makes.

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RE: Building Nakajima B5n2 <Kate> - 6/16/2008 10:34:14 PM   
JIMARRINGTON


 

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Status: offline 		Rich,

I have seen some folks doing some experimenting with gas on the smaller 2 strokes without changing to a needle bearing on the crank. They have just increased the oil mixture to 16:1. CH ignitions carries a spark plug to fit the glow plug hole. All of these experiments have been with Super Tiger engines using the stock carburator. A club member before he moved gave me a carb adapter for a ST G90 to fit a Walbro carb. I have a set of plans for a Robert Sweitzer Zero that I have been thinking about trying this on. Would have to make a tap in the crankcase and the carb for a pump pulse but seems doable. Or I have also been thinking of just using a 25cc conversion engine on it. The ST will fit in the cowl. The 25cc will not. But oh the power. The Sweitzer plans are very detailed with cockpit drawings and all but only has a 62" ws. I love this plan but have not built it yet because I too am tired of glow power. Not so much the oil mess but the reliability and cost of gas is so much better.

I flew a 4 star 120 yesterday with a Ryobi 31cc weedeater engine that I had converted with electronic ignition. More than enough power for the 4 star but was a lot of fun. The Ryobi ran ok but still needs some tweaking to get best performance. When I get it dialed in I hope to be able to start on a 1/4 scale Ryan STA that I ordered the plans from Man. The Ryobi should fit in it nicely. And if it does well there, it might be a good candidate for the Val too.

Jim

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RE: Building Nakajima B5n2 <Kate> - 6/17/2008 4:46:35 AM   
Baldeagle


 

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