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Seagull Model Cessna 337 ARF

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Old 12-11-2012, 06:43 PM
  #26
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Default RE: Seagull Model Cessna 337 ARF

Thanks drdoom!

We got a little more done tonight, but it doesn't look like it amounted to much in the pics, though. Biggest progress was, a friend spent about 20 hours working on the graphics and converted everything we need to vector files for the vinyl cutting. You can see some of the pages he printed to check size in a few pics. We modified the front hatch so we could raise the tank and made it lock in at the front. We mounted the new nose gear, removed the servo boxes, and filled lots of holes in the firewalls. Still have to cover up the front muffler hole and mount engines next. We had the rear engine test fit and it looks like we can move the exhaust in such a way that it will exit in the scale location with little work. We noticed that the axles that came with the kit are a little iffy, so may swap those out as well.

Probably won't have time to work on it again until the weekend, but more when I get a chance.
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Old 12-11-2012, 07:22 PM
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Default RE: Seagull Model Cessna 337 ARF

Adam;
The re-make to the Red Bull C-337 Skymaster is looking very good!! Its to bad no make retract for this bird. Thanks you for the picture of the mod you did on the front hatch so you can move the front tank in-line with the crab. If Red Bull see this, they may fly their full scale C-337 down to do a photo shoot with your plane!!! That would be a blast!!!
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Old 12-12-2012, 04:01 PM
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Default RE: Seagull Model Cessna 337 ARF

Adam;
Did some work on the Cessna 336 today and found out the stock push rod for the nose wheel is to weak even with the tube that they have with the rod. I hood it up today and when I move the nose wheel. the wire just bowed!! I tack the tube in place and still the same thing!!![>:] I went a stiff wire that I had on hand and it work very good now!!! I will put in the throttle push rod tomorrow. The extra holes in both fire-wall line up with my throttle arms on both engines!! Now for the servos to come in so I can start on the tail!! She will not fly until spring, but that will give me time to work on any engine running problem!! Was at my local airport today talking to some friend of mines, when a sweeting looking Cessna 337P pull up to the gas pump. I forgot how sweet the full scale look!! He was in-route back to Texas with it. He told me the sad new, he will have to sell it next year. His wife has put the law down!!!!
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Old 12-13-2012, 02:54 AM
  #29
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Default RE: Seagull Model Cessna 337 ARF

Thanks for the tip, Sonny! We will pay close attention to that. We have to move the steering servo to the opposite side anyway. I wondered about the pushrods since they looked a little small. I ordered servos last night so they should be here next week. No big rush since our Static Show isn't until the end of March and we won't fly it until after that. Have you done any preliminary mock up and balancing with the engines installed? I'm curious how far forward we will have to put batteries, etc.

I haven't seen a full scale 336/337 in a very long time. When our local airport had airshows, there was an 0-2A that had the tazmanian devil on the side. He played music through a loudspeaker on the outside of the airplane when he taxi'd and had smoke on board. He would put it through a routine of high speed passes and wing-overs. I think that is when I fell in love with this plane at an early age and it has been my favorite ever since. It's a shame there still aren't more around. The sound of one flying over head is unmistakeable. Reminds me of the sound from a Long EZ, only better since it's a twin.

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Old 12-13-2012, 05:14 PM
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Default RE: Seagull Model Cessna 337 ARF

Adam;
Well both throttle are in and work!!! As you can see, lots of room to lay wire. I am going with a 6 volt setup on the battery. For now the battery will go up front as you see in the picture. I hope that will give me a good C.G. when it come time to balance her The manual call for the CG at 80 mm back from the leading edge of the wing at the wing root.
I will do more work on her this weekend. Our raining weather is here!!!
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Old 12-13-2012, 05:51 PM
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Default RE: Seagull Model Cessna 337 ARF

Looking good, Sonny! You will be ready to fly soon! Too bad we both have to wait until spring. I'm very curious to see how she flies.

Larry is off work until Monday (lucky) so he finished filling the holes in the firewalls today. He also finished opening up the rear engine intake on the fuse. I stopped by tonight and we got both engines lined up and mounted and both cowls cut for the cylinder heads. They look really nice with only the valve cover sticking out. He also started sanding down the rear cowl and getting it ready for primer. There is a TON of clear on those things!

Next will be needle valve holes, exhaust routing, air exit holes, throttle and steering pushrods, and fuel tank trays. (I'm starting to think we should have just built a kit, haha.)
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Old 12-15-2012, 04:21 PM
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Default RE: Seagull Model Cessna 337 ARF

Adam;
Got some more work done today!! She is starting to look like the Cessna 336!! The rear cowling do sit high and I hope that help with engine cooling. I did not have to do a lot of hacking to mount the cowling over the rear engine. I still have to cut a hole in the bottom of the rear cowling for out flow air. I had to do a small mod on the front cowling to get it to in place. I thought I had to loose one of the landing light mount because of the muffler, but after looking and thinking, I did not!!! I have to take a picture to show you what I did to make it work. Still waiting for the flaps and elevator servos to come in. Every thing else is in place!! Now to work on the lighting system. I think I will go for a switch on that!!
Stay tune for more up dates!!
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Old 12-16-2012, 06:35 PM
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Default RE: Seagull Model Cessna 337 ARF

We got some more work time in this weekend. Progress has been slow, but we're getting a lot of the technical stuff out of the way. Got most of the engine work buttoned up. We managed to get both tanks mounted, cut the vents in the back, and test fit throttle and steering pushrods. We also got the stab and elevator re-covered. Still have to cut exhaust exits and a few more of the scale air exits. Larry ordered his second engine and the remaining LED's and controller for the lighting system, so he should have all that along with all the servos by next weekend.

One thing to mention to anyone wanting to build this and leave it stock, you are right about the rear cowl... the fit is terrible! We ended up cutting it totally in half and cutting a 1/4 to 1/2 inch out of the middle and piecing it back together to get it to sit correct on top and bottom. It's still not perfect, but much better.

Attached the latest pics...
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Old 12-16-2012, 06:40 PM
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Default RE: Seagull Model Cessna 337 ARF

These show mods done to the rear cowl and the rear vents. Works for the real one so hopefully they will aid in cooling like we think they should. We will probably fill back up the slot we cut behind the head for the glow driver and use a remote glow set up for starting.

More tomorrow...
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Old 12-16-2012, 07:24 PM
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Default RE: Seagull Model Cessna 337 ARF

Looking very good Adam!!! I see you change tanks from the stock one. What size did you change to!! If I remember right, on the full scale model, you could open and close that vent as need to cool the engine. When you go to cut the holes for the muffler exhaust, you will find you may need exhaust deflectors so the exhaust will not go back into the cowling!! I also did the mod on the stock rear air vent. I want as much air I can get going over the rear engine!! I don't know of anyone else building this plane. I would love to hear a flight report on this bird!! I hope we have a break in the rain we have had for the last 3 weeks, so I can start the engines to see how they run in my setup!!
Keep me updated and I will do the same!!
Merry Xmas!!
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Old 12-17-2012, 08:35 AM
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Default RE: Seagull Model Cessna 337 ARF

Thanks Sonny. I saw in your pics that you had opened up the top scoop. Looks good.

The tanks we used are Hayes 11oz. I really like their simplistic design and the fact that the stopper really can't come out. I've never had one fail.

For the exhaust, in the front we need to order a 90 degree header to keep the muffler hidden in the cowl. We will then run brass tubing from the muffler exit to the bottom of the cowl and try to get it to come out in the scale location. We will do the same with the rear, but since there is more room, won't need the 90 degree header elbow. This way, both mufflers will be hidden.

I've been searching for any video of this model on youtube, etc, but still no luck. Hope you get a chance to run your engines. Should sound sweet!
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Old 12-17-2012, 02:35 PM
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Default RE: Seagull Model Cessna 337 ARF

Hi Adam,
Well add the wings to the center section today and want to see the size of this bird, and I must say, I love it!!! Well after I saw the size, than the big question came up, will it fit in the back of my 2001 Ford Escape?? The fuse fit with room to spare, but, the wings and center section just did fit. I will take a picture later and show you. Now I know why a lot of my club member have trailers!!! Like your-self, I have look on you-tube and some of the other RC Forums to see if anyone else is building this plane. So far I see we are the only two building this bird. Maybe they know something we don't know!!![X(] The weatherman say we may have 2 days with out rain. I hope that is true, that will give me time to run the engine to see if I have to move the front tank up like you did. I will let you know how they do if we do get the 2 days with no rain!!!
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Old 12-18-2012, 01:19 PM
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Default RE: Seagull Model Cessna 337 ARF

Okay Adam,
As you can see, she just do fit in the back of my Ford Escape!!! Later down the road, I will buy a trailer!!!
Sonny
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Old 12-18-2012, 02:28 PM
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Default RE: Seagull Model Cessna 337 ARF

Did you glue the outer panels on? I was under the impression they were removable.

I have a pair of unused K&B .48s I was thinking would work for this bird.

Mike
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Old 12-18-2012, 02:54 PM
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Default RE: Seagull Model Cessna 337 ARF


Quote:
ORIGINAL: optech

Did you glue the outer panels on? I was under the impression they were removable.

I have a pair of unused K&B .48s I was thinking would work for this bird.

Mike
Hi Mike,
Welcome to the thread!!! The down size with this ARF is that the outer wings has to be glue to the center section!![] Yes you can un-screw the center section from the fuse, but that's it. Now if you would open the wings and center section and do a mod to where you can slide the wings into the center section and screw them in place, will be a big step. I am going with two Evo .46 engine in my bird and I know the pair of K&B .48 will fly it good. I had a pair of the K&B .48 back in the days and I love them!!! I think you will like this ARF. Adam and I have found some thing that are not right on this bird and we have talk about it here and show pictures of what we did to make it right!! I hope this answer your question!!!
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Old 12-18-2012, 07:14 PM
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Default RE: Seagull Model Cessna 337 ARF

Quote:
ORIGINAL: jet22b


Quote:
ORIGINAL: optech

Did you glue the outer panels on? I was under the impression they were removable.

I have a pair of unused K&B .48s I was thinking would work for this bird.

Mike
Hi Mike,
Welcome to the thread!!! The down size with this ARF is that the outer wings has to be glue to the center section!![] Yes you can un-screw the center section from the fuse, but that's it. Now if you would open the wings and center section and do a mod to where you can slide the wings into the center section and screw them in place, will be a big step. I am going with two Evo .46 engine in my bird and I know the pair of K&B .48 will fly it good. I had a pair of the K&B .48 back in the days and I love them!!! I think you will like this ARF. Adam and I have found some thing that are not right on this bird and we have talk about it here and show pictures of what we did to make it right!! I hope this answer your question!!!
Sonny
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Sonny, that just barely fits into your Escape! Larry and I both have vans for airplane hauling so think we won't have an issue with transportation.

Mike, welcome! I think Sonny's plane may be a different version than the one I have been working on. The outer panels are removable on ours and held on with a screw through the bottom of the wing into the wing tube. The tail booms and stab are all glued together in one unit. We have noticed a few other discrepancies during the re-build. The box art shows the tail servo's mounted in the booms and also some places indicate that there are two elevator servos while others call for one. It's a fairly young production of this model so I would not be surprised if they are still making changes as they go.

We now have all the control surfaces, struts, and hatches covered as well as the bottom of the wings with the base color. We also have repainted the inside of the fuse. Best of all, Larry's son Shawn (same guy working on the graphic files) decided to repaint the pilot. See below!

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Old 12-19-2012, 10:26 AM
  #42
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Default RE: Seagull Model Cessna 337 ARF

Adam;
Two version of this model is not good!! At least they should give the buyer to buy one like I have or like you have!! Now you don't know what version you will receive when you order it!! I just took a good look at my box and you are right about the pictures that show the servos are in the tail booms and not in the center section like I have. Sound like my bird came from the first version with the wings glue to the center section and you have the next version with the wings that can be remove from the center section, ( which is better!! ). Please tell Shawn, he did a great job on the pilot!!! I know next spring your Cessna will turn a lot of heads. Did your manual say anything about the lighting system other that a picture showing how the landing lights go into the front cowling??
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Old 12-19-2012, 03:50 PM
  #43
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Default RE: Seagull Model Cessna 337 ARF

Adam & Mike;
There is only one version of this model!! On page 34 and 35 of the manual they just have two lines of text, but, four pictures of how the wings attach to the center!!! Each wing has a hole that go down to the wing tube. Pictures #2 on page show a drill and a 2.5mm drill bit going down into that hole!!! They say pictures are worth a thousand words and I miss it!!![>:][>:] I still know it will fit in the back of my Escape, but, I would be very mad if they did not and I am the one that screw up[>:][>:]
For anyone else building this arf, the wings do come apart from the center section!!!
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Old 12-21-2012, 07:51 PM
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Default RE: Seagull Model Cessna 337 ARF

Hey guys I finally found a thread on this bird.  Ive been building mine for about a month and had  alot of questions and nobody to answer them I hope you can help.  Well I dont know where to start.  I can tell you what Ive done so far.  The first thing I did was paint those ugly yellow horns white and now they look much better.  Second I put 4-40 blind nuts in my wing servo plates with socket head cap screws.  That may not be necessary but I feel better about it rather than wood screws.  Third I put 1 inch long wood dowels inside those aluminum wing tubes too give the screws something more to grip on but I noticed on the center wing where i put the wood screw that it tightens down over thin balsa and not plywood like on the outer wings so I may cut that out and reinforce it with ply.  Now for the questions.  I am going to use twin OS 46 AX motors but the problem is the exhaust is to large to fit in the fuse so I was thinking of getting some pitts mufflers and send the exhaust out the bottom of the cowls.  I figure this will be easier than modifing the fuse and all I have to do is cut holes in the bottom of the cowl.  Is this a good idea?  Second do you think the front cowl is supposed to extend over the front hatch to keep the front part in place I figure if you did that you could still slide the cowl on and off without too much trouble and the cowl would keep the prop wash from getting under it.  I dont know if thats what Seagulls intentions are.  There manual has to be the worst Ive ever seen.  The third question is do you think that elevator will work well with only one horn so far to one side?  I know with this plane they couldnt put it in the center but is it possible to put a second one on the other side?  The center wing will take another servo and it has another hole in the boom for another push rod. 

Ok im done for now
Joe
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Old 12-22-2012, 07:36 AM
  #45
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Default RE: Seagull Model Cessna 337 ARF

Hi Joe! Nice to talk to another going through the same build. By all means, post some pics of your progress if you can. My thoughts on a few of your concerns are as follows...

Elevator servo installation... Ended up going with one Hitec 225MG on elevator (for now). I have left the option open to run a second servo of the same size if for any reason it feels like there is flex or play on the opposite side of the elevator away from the control horn. It seems odd to me that there is a slot for a second control horn, the pushrod guide tube is already in the boom, and the servo cover is molded for a second elevator servo on the opposite side yet there is no mention of its installation. If I would have thought about it a little more, I probably would have just opted for a couple of HS-85's on elevator and been done with it. My advice, if you want to run one servo, use the biggest that will fit in the opening provided and check for slop, If you have any doubt, double it up.

Hatch fit... Our cowl trailing edge fits just flush with the front of the hatch. Granted, we are using a longer four stroke and the cowl needed moved forward a bit. You may very well be able to position yours in such a way that it will lock down the front of the hatch and that is probably the route we would have went given a different engine set up.

Pitts mufflers... Pitts mufflers work great and sound awesome! My only real concern here would be fuel draw. In my experience, they create less muffler pressure to the tank and might be of concern (for me anyway) since the stock location of the tanks are so far below the center-line of the engine. It may work well on the ground, but could cause fuel flow problems with positive G's. Still, if you could raise the tanks some, it would be cool to have the twin exhaust stacks exiting the cowls in the scale location.

Wing tube and mounting... So far, this seems to be the main area of concern with this model. First, our wing tube has a hard plastic liner inside that I imagine was meant to be a backing for the screw to thread into. I still like the idea of running a dowel inside the tube and drilling and tapping it. We will probably do this as well. Second, I read on Horizon's site about people using dowel or ply to reinforce the area where the wing tube screw goes through the wing and into the tube. Since we stripped down practically the entire plane, I was able to confirm that while there is balsa sheeting on the bottom, the screw runs through several sandwiched ply plates before entering the tube sheath and into the tube. I feel like this should be a pretty strong attachment method for this model. We will probably beef it up a little since the wing is already apart, but doubt I would worry much about it if left stock. I attached a few pics below for reference. For the inboard panel, I thought that the tubes were supposed to be glued in, so haven't given much thought to making any changes there. I may need to check that out as well.

We are still plugging away but progress is slow since the holidays are near. I'll post more pics as greater progress is made.

Happy building!!!
Adam
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Old 12-22-2012, 02:36 PM
  #46
jet22b
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Default RE: Seagull Model Cessna 337 ARF

Hi Joe,
Welcome to this thread! Yes I think we are the only thread talking about this bird!! On the front hatch of my bird, I put pins in the hatch to help hold it in place( See pictures below. ) I went with two Evo .46 on my bird. The muffler on the front engine went in place with no problem. The only mod I had to do was to open the hole at the bottom to give more room for the exhaust deflector to fit in place. For now I will go with the one servo set-up for the elevator until I fly her and see if I need to go with a two servos set-up. I think the pitts muffler will work, but you may want to move the tanks more in-line with the crab. Adam and I move the back tank in line with the rear crab. I left the front tank as shown in the manual for now, until I can run the engines to see if there is any problem with the fuel flow to the engine. Like you said, the manual is not a lot of help!! The lights are in and that was a ton of fun doing that. I wish they have put a red and green caps for the lights in the box. Can not wait to see Adam with the tail lights on his!! I also was looking at the wing hold down plate in the wings and will put in a ply plate just for grin!! It will not be until spring before I can fly her. I can have everything set and have a good maiden flight. Please post pictures of your build and if you have anymore question just ask!!!
Sonny
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Old 12-22-2012, 03:15 PM
  #47
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Default RE: Seagull Model Cessna 337 ARF

Hey Sonny, how much of the windshield corners did you have to trim away in order to fit around the latches???
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Old 12-22-2012, 03:54 PM
  #48
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Default RE: Seagull Model Cessna 337 ARF


Quote:
ORIGINAL: Herc Pilot

Hey Sonny, how much of the windshield corners did you have to trim away in order to fit around the latches???
Adam;
Here are two pictures of what I did. I put the windshield in place and place mark where the latches touch the windshield when close and mark where the latch is open. From the edge of the windshield, I went 1/16" to the close mark. I cut out the area between the close and open mark and sand the area to make it work with the latches. As you can see it came out nice and the latches move smooth!!
Sonny
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Old 12-23-2012, 09:27 AM
  #49
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Default RE: Seagull Model Cessna 337 ARF

Thanks Adam and Sonny for your input and advice I will most likely follow your builds and copy them for the most part. 

Here are the servos I'm going to use.  My local hobbystore had a sale on them and they suggested these.
Hitec HS 425BB for the ailerons and flaps
               225BB for the rudders and elevator (I have one extra for the elevator if I need to add it later)
               311 for the throttles

Well I've been flying electrics only for quite awhile now mostly foam and now I want to switch sides.  I like the noise and the smell.
So my expierence with nitro is limited.  Last year I built a Great Planes Spitfire with an OS25 that I had new in the box and loved it.
Now I want more nitro planes.

I looked at fitting the OS46 motors again and the stock exhaust is way to big.  I measured the front hole in the firewall and the exhaust and it looks like the exhaust is an inch or more to long.  So I'm gonna go with the Pitts on the front for sure the rear motor may work with the stock exhaust.  I will raise my fuel tanks as you guys did.  I do have a question on how big a reciever battery are you gonna use.  What volt?  How many mAh? Im using spektrum.

I will get some pics when I get more done.

Thanks again
Joe
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Old 12-23-2012, 12:11 PM
  #50
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Default RE: Seagull Model Cessna 337 ARF

Joe,
I am going with this battery!
http://www3.towerhobbies.com/cgi-bin...7&I=LM1524&P=K
Use them for the last three year with no problem!!!
I think the servos you are going with will be fine!! I have been around nitro since the mid 60's and I still love it, but I also fly electrics!! So I am on both side of the fence!!!
If you need any help or have more question, just post!!!
Merry Xmas!!!
Sonny
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BTW: If you love the Spitfire, stop by the Spitfire Brotherhood in the War Bird Section of RCU!! I think you will enjoy it!!!
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