First look. DPM Ultimate 40.
 

I received my true red Ultracote. Yes, it is the correct color.

The aileron hinge lines are now sealed. I balanced the plane laterally. It required a bit of lead in the left wing. I have moved the battery pack about as far to the rear as possible. The CG is much better. Probably where it should have been for the first couple of flights.

The plane doesn't fall out of the sky on the landing approach any more. It also takes very little down elevator to fly inverted now. However, the plane still won't flat spin.

I am also experiencing differential throw on the elevator halves at extreme deflections. They act like ailerons and spin the plane. At this point, I haven't figured out what to do about the problem.

That is all for now.

Test Flight
 

Just test flew a friends with a YS .63. Unlimited vertical hardly describes it! Had rocket like acceleration from a stop on uplines. Like Jwatwood, I agree that the recommended throws (even high rates) are conservative. Plane flew rock solid with no bad tendencies. Quite a bit of roll coupling in knife edge but I am sure this can be mixed out. This one too was conservatively nose heavy but better safe than sorry. I think this plane will be a real winner!! cbk

First look. DPM Ultimate 40.
 

What do you guys think of a Saito .80 four stroke in the DP Ultimate .40? Too much or ok? Only weighs like 19.5 ounces and that's less than the OS 70FS by an ounce or so.

Also, what did you use to seal all the hinge lines??

Saito 80
 

Mark, I overpower almost all of my planes but can honestly say that the Saito .63 was almost too much power. I have never flown a plane that accelerated this hard vertically. I guess I would compare the weight of the Saito to the YS. The plane definitely is nose heavy with the YS although I think it can be changed without adding tailweight. But for an airplane this small to fly as well as it does I think the weight may be critical.
I seal my gaps with clear Ultracote. I think this is what my buddy used on his Ultimate. Hope this helps. cbk

First look. DPM Ultimate 40.
 

I used true red ultracote to seal my hinge lines. The manual also suggests that clear packing tape would work.

I agree with cbk07 that a Saito .80 would be to much. I get so much torque from my OS 50 I have to be careful landing. I blipped it on the approach and it started to roll on me.

First look. DPM Ultimate 40.
 

I'm very careful with the throttle. Just wonder about the size and weight differences between the Saito .80 and the .63 and whether the airframe can handle the power. My typical view is you can always throttle back and fly at 1/2 or lower and use the throttle for vertical or emergencies if needed.

Saito FA-80 Specifications

Bore:
27mm

Stroke:
22.8mm

Displacement:
13.1cc

Weight w/ muffler:
540g

Cylinder:
AAC

Exhaust Diameter:
12 mm

Crank Thread:
7 x 1mm

Propeller:
11.5 x 8 - 11 x 10

RPM:
2,000 - 11,500

HP:
1.3



The Saito .65 specs

Saito FA-65 Specifications

Bore:
24.8mm

Stroke:
22.0mm

Displacement:
10.6cc

Weight w/ muffler:
550g

Cylinder:
AAC

Exhaust Diameter:
12 mm

Crank Thread:
7 x 1mm

Propeller:
10 x 8 - 11 x 7.75

RPM:
2,000 - 11,500

HP: 0.95


As you can see with LESS weight on the Saito 80 I can get around 30% more horsepower.

First look. DPM Ultimate 40.
 

Has anyone seen the Global Ultimate as well as this one? Just wondering if the DP is worth the extra $50.

CBK, what exhaust arrangements did you use with your YS 63? This is the engine I would be using.

Also, what prop are you using? I'm partial to a 13x6 on this engine; does the kit gear provide enough clearance?

Steve

First look. DPM Ultimate 40.
 

I also need to know prop clearance if I'm going to go with the Saito 80. Anyone?

First look. DPM Ultimate 40.
 

Jwat, have you tried an APC 12.25X3.75 ? The 50 seems to like that prop the most out of all I've tried. Gobs of tourqe and more than enough speed.

First look. DPM Ultimate 40.
 

For Reference:

I am running an OS 50 SX with a spec of 1.8 HP.

My total weight up front is 551 grams (17.8 oz). This included the engine, a slimline pitts muffler, and a Perry fuel pump/regulator. I also have a dubro filler valve mounted to the firewall.

With the battery placed via instructions, behind the firewall, the plane came out seriously nose heavy. The battery is now placed behind the servos right in front of the cockpit and the plane is still nose heavy but within range of the CG in the instruction book.

For reference the engine used in the manual is the YS 45 which weighs in at 400 grams.

F16FxR4real, no I have not tried that prop for excessive noise reasons.

First look. DPM Ultimate 40.
 

jwatwood - 551 grams is actually 19.43 ounces by my calculations. Also 11 grams more than the Saito 80 but more HP by .5

First look. DPM Ultimate 40.
 

I am just about done! :D
I should have her ready for this weekend. If the weather permits. The winds have been atrocious lately.

Here is a photo.

http://pages.sbcglobal.net/treznick/...timate2SmJ.jpg

First look. DPM Ultimate 40.
 

Marc,


The site http://www.sciencemadesimple.net/weight.html

converts 551 grams to 17.7151 Ounces (troy)

which is also 19.44 oz (US)

I should have included the units of measure.

First look. DPM Ultimate 40.
 

LooneyTunes,

Your bird is looking real sharp! Where is the fuel fill? Other side? What brand spinner do you have on it?

Looking forward to your comments on flight...

First look. DPM Ultimate 40.
 

Thanks jwatwood;
I put the fuel fill lines in the cowl cutout in the bottom. It consists of just two lines with plugs and a strip of velcro to hold them in place. Nothing fancy. The spinner is a 2 1/4" Jet style Tru-Turn. The cutout barely fits the 12X8 APC I am using.

First look. DPM Ultimate 40.
 

LooneyTunes,

If you have a moment, would you please compare the Tru-turn spinner with the kit spinner for clearance with the cowl.

I found out after purchasing a Dubro-spinner to replace the kit spinner, that the clearances where different. The dubro backplate came in contact with the cowl. :(
I haven't seen JBL spinners for sale where I shop.


Thanks,

Jim

Spinners
 

Jim, both TruTurn and Dave Brown spinners have a flat backplate like the one in the kit. Either will fit and look great. They also can be polished to give a mirror like finish. The Dave Brown is less expensive than the TruTurn and looks as nice. cbk

First look. DPM Ultimate 40.
 

cbk is correct. The Tru-Turn backplate is flat just like the stock spinner.

I did have one problem with the Jet style Tru-Turn. The bolt supplied with the spinner is about 1/8" too long. It would bottom out on the propshaft before the spinner cone was tight. I guess the longer propshaft on the fourstroker had something to do with it. I took a shorter bolt from another spinner I had laying around. Now everything is nice and snug. :)

Broken Elevators
 

Hey guys anyone had two broken elevators? I just purchased this DP ultimate kit and I was looking over the excessively loose covering on my model and noticed the 2 elevator halves seemed a little loose. So I removed the covering and both elevator halves were in 2 pieces. The only thing holding them together was the covering. It looks like they are made from 2 seperate pieces of balsa and glued together. Well I guess they forgot the glue. Or just not enough.

How was everyone elses covering job? My covering looks good but is very wrinkled. Looks like a few hours with the iron is in the works.

Well better get busy cant wait to get it finished. It should be a fun one.

Good luck all!!!!!!!!!!!!

First look. DPM Ultimate 40.
 

I have the Large Ultimate and the covering on one edge of the wing was a little short. Striped it off and patched it. The covering peels off really easily. Really hate Ultracoate. Doesn't stick the same as monokote even with lots of heat.

I didn't use pull-pull on elevator. Used carbon fibre rods and 2 servos. Should have maiden flight this weekend. This plane took a lot longer to assemble than I thought. Some hardware was changed, some didn't fit and a couple of wrong pages in the manual had me wondering what I was missing.

First look. DPM Ultimate 40.
 

My covering was generally good. However, behind the canopy was very wrinkled and the balsa dented. A work over with the iron made it tolerable. My elevators were okay.

The area behind the canopy and the rudder is not very strong. I had my son helping me and he squeezed a little too much. Oh well.

First look. DPM Ultimate 40.
 

My covering is very good. A few wrinkles here and there but nothing major. The only complaint I have about the covering is the amount of overlap at the seams. In most places the overlap is 1/16" or less. I was taking out some wrinkles with my heat gun and had a seam pull apart. No more heat gun for this plane. It's back to the sock and iron. :angry:

My elevator halves seem fine. I'll have to take a closer look when I get home today.

First look. DPM Ultimate 40.
 

I have confirmed it. I have differential throw on the elevator halves. :(

I have done some multi-point function mix (elevator/aileron) programming, in an effort to counter the condition. I will fly it this weekend and see what happens.

I will probably end up moving the servo in the tray.

So here is the warning that is not in the manual. Make sure the elevator servo is exactly in the center of the servo tray. Make sure your control horns are in exactly the same position on either side of the elevator. It does make a difference.

First look. DPM Ultimate 40.
 

good tip...I have not got to that point yet thankfully and will heed your advice.

First look. DPM Ultimate 40.
 

jwatwood;
That's an odd one. I must have gotten lucky. I just measured the elevator travel with one of them GP gages. Mine is the same on both halves. My elevator servo is off center as well. Are you sure your pull cables are not hanging up somewhere? Or the elevator horns are exactly over the hinge line and in the same position? Also, take a look at the servo horn. Make sure it is centered when neutral. I hope you get it all straight. Good luck. :)

It looks like next weekend is D-Day. I still have to break in the engine this weekend. But next weekend she will fly! :D