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RE: Dornier Do 335 build - 3/13/2007 3:07 PM   
DragonLines



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From: Toone, TN, USA
Status: offline 		He does do good work doesn't he. I got my 335 home but forgot to take pictures to post. I'll be back in about three weeks and will get them up so maybe you guys can help me indentify the mfg. I look forward to seeing your finished plane Mel.

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RE: Dornier Do 335 build - 3/16/2007 4:06 AM   
mel2498


 

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Status: offline 		Tim,

If you think you are going with a 70" version check out this site for some details regarding the plans, there are certainly some issues with both the 70" and 81" plans. It seems that these plans where probably scaled up and the problems were just copied over, but Alf has reworked his plans and has a fix for the 70" version if you access to a program that will work with cad files.

http://www.alfsrc.com/

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RE: Dornier Do 335 build - 3/16/2007 1:38 PM   
tubig


 

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Status: offline 		thanks mel. bummer about the problems with the 70" version. i didn't realize both had similar problems. i just ordered the plans and front and rear cowls for the 70" version so it's good to know i'll need to review them carefully before starting. i'll check out alf's site as well and, of course, continue to watch your progress. thanks for the help.

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RE: Dornier Do 335 build - 4/20/2007 2:03 AM   
mel2498


 

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Status: offline 		Ok I am back and I have to admit I have been a bit lazy but I have been chipping away at my build. Here are a few pics of recent happenings.

First pic is the sizing together of the two wing halves, what a bloody mess I make, but it is not hard with the small area I am working in.

Second pic is the joining of the wings after skinning the top side.

Third shoot is the wing being held upright by my son.

Finally a few shoots of the rough air frame.

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RE: Dornier Do 335 build - 4/20/2007 2:32 AM   
DragonLines



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Status: offline 		Nice work. I have been tinkering with the one I bought. I am pretty sure it is the same one you are building. At least from the same plans. I keep forgetting to get some pictures to post. Have it apart now to mount engines. It had a OS .40 on the back when I got it. Bad bearing in it. Going to put a 52 OS on back and a Saito 91 on front. Changing the servos, reciever. Need to check out the retracts. They say Robart but are not familar looking. This one has been glassed and painted. Fair job, not show quality. Hope it isn't too heavy. Looks good though.

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RE: Dornier Do 335 build - 4/21/2007 8:21 AM   
Bosmodelair


 

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From: Huizen, NETHERLANDS
Status: offline 		Here 2 video`s of Our Pfeil:


Do-335 Pfeil maiden
Do-335 Pfeil second flight

Greetz,
Berto.

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RE: Dornier Do 335 build - 4/21/2007 6:16 PM   
kram-RCU



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Status: offline 		That's for the videos.

My friend is building this plane.

Very inspirational and very educational.

Nice flying on one engine! Did it kind of stall when the engine went out, then you recovered?

Your problems with nose gear confirm my suspiscions that it will be a problem area.

I guess one answer would be to massively bulk it up since you need weight in the front anyway?


mt

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RE: Dornier Do 335 build - 4/21/2007 10:43 PM   
Bosmodelair


 

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Status: offline 		At the first fligth the aft engine went out at the last circuit.
But with only the front engine on the plane still flew very well.

At the second video teh aft engine just went out at short final.
The weird nose down action was probally due to the fact that just after take off I lost 300 gram of lead out of the nose so the CG moved approx. 1,5cm aft.

That`s what we guess, we don`t know for sure, it also can be interferrence, we shall she on the next flight.

Our Pfeil is scale 1:7, has a wingspan of apprx. 75"
has a 4-stroke OSmax FS 120 Surpass in front and a 4-stroke OSmax FS 90 in the back.
Both props are 3 blades (the aft a pusher) from Master Airscrew.
front tank is 500cc aft tank in front of the motor 300cc.

I had to put 27 ounce (+/- 750 gram) of lead in the nose to get the CG right.
The total "0 fuel" flying weight is +/- 19 lbs with fuel +/- 21.5 lbs

the aft engine both times runned out of fuel after 5-6 min, so we want to install a bigger tank in the mid fuselage.
Better for the CG.

Grt,
Berto.

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RE: Dornier Do 335 build - 6/22/2007 2:56 AM   
tlrascal


 

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Status: offline 		Well I am encouraged to complete mine. It is 120 span and you can see at www.4mht.com or here are a few pics.

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RE: Dornier Do 335 build - 6/23/2007 5:18 AM   
mel2498


 

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Status: offline 		****ascal, is that a Ziroli you got there or some other?

I have been lazy with my camera of late, I have nearly completed installing all my electronics with exception of the servo to steer the front landing gear. Work is also eating up to much time so if I can get motivated on my lone day off this weekend I will try and get some new photos posted.

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RE: Dornier Do 335 build - 8/3/2007 5:53 PM   
mel2498


 

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Status: offline 		I am back, I had a computer melt down and lost all, absolutely all my photos of the work that I had done from Dec up until the last week of July. Oh well.

Here are a few photos of what things look like right now, if I could get a couple dry days I would begin to glass my Do. Last week has been smoothing out the skin and filling any large gaps that the glass could not handle.

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RE: Dornier Do 335 build - 8/3/2007 10:41 PM   
Rocketman612



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Status: offline 		Thats a well deserved smile.

Consider sending your hard drive to a center that can recover data. You would be surprised at what could be recovered. It may cost but think about it.


Pete


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RE: Dornier Do 335 build - 8/25/2007 1:32 AM   
mel2498


 

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Status: offline 		Ok here are a few new ones, fiber glassing the wing.... sanding the primer, of course everyone needs a picture of their plane on the kitchen table and the nearly complete build after painting.

I really need to work on my finishing skills, there was a good number of things that I was not to happy with when I finished the painting. But since this was my first large scale scratch build I am pretty happy and am I not going to beat myself up over it.

At this point I have some detail work to do with the exhaust and I need to install control linkages to close the nose gear doors along with the main gear doors. There is also a matter of the windscreen and the cockpit detail but if I had any fuel left I could take her out and crash her right now. lol I am going to save it for next summer though and take it to the Warbirds Over Denver show, perhaps I will get in enough practice weather permitting that I will not plant it nose down at the show.

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< Message edited by mel2498 -- 8/25/2007 1:50 AM >

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RE: Dornier Do 335 build - 8/25/2007 2:11 AM   
Rocketman612



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Status: offline 		Well done.

Good luck with the maiden.

Pete


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RE: Dornier Do 335 build - 8/25/2007 2:15 AM   
oldvet70



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Status: online 		Well it looks as if you are almost done. I've watched this all along as I have the exact same 'Short Kit' in my closet waiting for time to build. When it's all over and done how about a listing of all the things you found best to use, gear, struts, wheels, paint, radio equipment, engines, props, spinners, tanks, etc. I know I'd appreciate it and I'm sure others waiting to build theirs would also. Don't beat yourself up at all. This is a difficult build and I think you have done a great job. Best of luck when she flys!

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RE: Dornier Do 335 build - 8/25/2007 5:28 AM   
Ram-bro


 

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Status: online 		great looking DO-335. You will find that it flies and grooves like a pattern bird. Mine had a small accident. It is repaired but I think I will strip her down and repaint her. Make sure you have good cooling to both engines......especially the rear. My 1st flight I blew out the glow plug right on rotation....I was committedto fly . It struggled around but I got her back. I opened up the fronnt cooling a bit and I will do the same on the rear. I think I might have a pic of it in my gallery...

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RE: Dornier Do 335 build - 8/25/2007 6:42 AM   
Bosmodelair


 

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From: Huizen, NETHERLANDS
Status: offline 		Hye mel2498,
That is a great looking Do-335`s
But is your landing gear not to low, the lwr vert. tailplane is touching te ground, on teh photo`s there`s now way you can give the airplane some nose up angle for take off or landing?


But all that photo`s makes me want to fly again with the Pfeil version 2.

The 2? yes, our Pfeil 1 is crashed due to a loose vibrating cristal and completly wacked (not completly the rear engine was unhurt )
Here the photo`s of the crash site.


Our second Pfeil ha`s no retractable gear and needs some more modifications.
The retractable gear of Pfeil 1 will be used, the aft tank will be more in the middle (just as the engine?????).
But that 2nd one will fly again with some modifications I`ve learned from pfeil 1.

It only will take some time due to some other project

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< Message edited by Bosmodelair -- 8/25/2007 6:43 AM >

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RE: Dornier Do 335 build - 8/25/2007 7:39 AM   
mel2498


 

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Status: offline 		Bosmodelair ,

As she sits right now without any adjustment to the CG she does sit low in the tail. I am going to cut another 1/4 to 1/2 inch off the nose strut and then adjust the CG adding much more weight to the front. I would rather have added longer main gear but I did not discover the problem until I had performed a couple fittings of the basic build. I also hurt myself by adding some additional wood to the lower rudder, the idea was that I would add a small amount of length to to the lower fin to further protect the rudder in case I did drag it on a take off. I was perhaps a little over zealous with the amount of wood I added though. That just is another * to the numerous mistakes I made, but its all about learning.

I am thinking for a follow up since I can never just do something simple I will build a Mistel Composite. I have some Ju 88 plans, just scale them up to about 112-120" wing span and get a 80-90" set of 190 plans and go crazy, what do you think? LOL!

BTW what was the kit your Do was built from, I noticed the foam core wings?

< Message edited by mel2498 -- 8/25/2007 7:41 AM >

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RE: Dornier Do 335 build - 8/25/2007 7:56 AM   
Bosmodelair


 

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From: Huizen, NETHERLANDS
Status: offline 		I think that you then still will have some angle problems during take off and landings

See the attached pic below of our Do and the opening at the lwr rudder.
Even with this set up I hit sometimes the ground during take off and landings

On the first video`s you can see that the angle is to big, at later flight I had a better angle but even then is hit sometimes the ground.


Our Pfeil`s are from a drawer from Germany: VTH Hermann Rommler, we`ve bought both planes second hand.


Looks like you won`t be bored in the near future with the new plans


Greetz,
Berto







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RE: Dornier Do 335 build - 8/25/2007 8:52 AM   
joey_snaproll


 

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Status: offline 		Crashes like that just hurt,Really hurt in the wallet though. Good size crater ,Was it coming down like a lawn dart? sure looks that way.
Just a shame.

What retracts are you using on these planes? I have a Al Masters Do335 81 ' span coming , should you follow the landing gear length on the plans or should they be longer?

Joe

< Message edited by joey_snaproll -- 8/25/2007 8:54 AM >

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RE: Dornier Do 335 build - 8/25/2007 6:19 PM   
mel2498


 

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Status: offline 		Joe,

With your kit you should get some walkthru instructions and in those the builder had his landing gear custom cut to length by Robart, but there wasn't a clear explanation as we to why he went this way, or maybe it would be better to say I didn't understand why at the time he did this. I went with stock length Robart gear 635 series with 7/16 struts. The struts are what I should have paid more attention to, asking Robart to produce a custom length an inch longer to begin with. But this is all hind sight now so if I have major problem with gravity that requires some rework I will likely replace the struts.

Mel

< Message edited by mel2498 -- 8/25/2007 6:21 PM >

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RE: Dornier Do 335 build - 8/25/2007 7:11 PM   
Bosmodelair


 

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Status: offline 		The original Pfeil is also standing height on his legs, that`s why most standard struts are way to short.
Our struts are some old AMT air retractable mecahnisms with long home made spring absorbing struts.

Without these long struts the take off angle will be 0 because the lwr stabilizer will hit the ground.
Than only take offs from long runways will work I guess.

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RE: Dornier Do 335 build - 8/26/2007 7:24 AM   
joey_snaproll


 

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Status: offline 		Also do you need to use the 85 degree retracts?will the wheel tuck in with the 85 degree ones or is it better to get the 90 degree one's and reangle the the retract mounting plate to suit. I 've done this on my .60 size mustang to get the wheels farther in the wing so the gear doors fit into the wing.

Hey Mel what does your Do-335 weigh? Did you move your rear tank more forward?,and if so what pump are you using .Also what engine are you using for the back? Could you post a picture from the back I would like to see how far out the muffler looks. I want to make a muffler/motor mount to conceal it all .just have to make the the rad scoop really work to cool the rear compartment.

Joe



< Message edited by joey_snaproll -- 8/26/2007 7:43 AM >

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RE: Dornier Do 335 build - 8/26/2007 6:20 PM   
mel2498


 

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Status: offline 		Joe,

I used 85 degree retracts and I will get you a picture of the tail engine and muffler soon, I am leaving for work shortly.

BUT, my engines are a bit different from the recommended sizes, I leave in a very high altitude city, over 6200 feet so I used the largest engine I could get in the rear and a larger than recommended in the front. My rear engine is a super tigre .91 while the front is a GMS 2000. I was figuring on losing a good deal of power due to the high altitude I live and wanted to ensure I would have enough power to fly the thing. The rear muffler was a nightmare. I looked at several different styles of mufflers but none really worked. They either ended up getting into the prop or hung down to far. In the end I took the stock tigre muffler, cut the end off removed 4 inches of its length and then used JB Weld to epoxy the end I cut off to the remaining stub. You will see it in the photo, I have lost a good portion of the rear cowl but I have another which I am going to work with to try and get the scale look back. As for the weight yet I have not weighed it and there is still the issue of more weight that needs to be added to the nose when I set the CG. I am figuring the final weight might be 35-40 pounds once the CG is set, but that is a guess.

The rear fuel tank is right under the upper tail in the location shown on the plans, I am not certain if this is going to work out yet and I made certain I could move it into the fuselage if the need arises by making the lower air scope removable. This way I have access to the rear end of the fuse from underneath. Right not my fuel system is uni-flow but I suspect that if I have to move my rear tank forward I will have to get some sort of pump.

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< Message edited by mel2498 -- 8/26/2007 6:26 PM >

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RE: Dornier Do 335 build - 8/26/2007 7:25 PM   
DragonLines



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Status: offline 		Mel,
If you need to pump these engines try the Clines regulators. I am setting up a B-17 to run off one tank and they work great. It presurizes(?) the tank and then regulates the fuel to the carb. Very simple setup and your needle won't cahnge in flight. Would probably be good for you any way at altitude. I have been a bit lazy and haven't worked on my 335 latly. I am pretty sure it is the same one you are working on. Seems a bit heavy but planned on a Saito .91 up front and an OS .52 out back. It has some retracts but are very old and will probably be replaced. Try to send pictures next time I am home. If you search under pumps you should find my post on the four engine Cline deal. Plane looks great and am looking forward to your flight report.

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