Xardas26

I'm finishing up my Diamond Dust and was wondering how fast it will go with the Rossi 46 RAL Engine & Tuned Silencer 27M46

http://shop.vendio.com/RossiEnginesU...726/index.html

I'm gonna do the first couple of flights with the Rossi Muffler, and then switch to a macs tuned pipe. What is a good prop for this combo and what speed can I expect??

Clean

150-175 maybe.

proptop

My Feedback: (8)

Guys...got a question...
I've never built one of these, but since a couple of my fellow club members have, I've been considering it. Is the whole thing sheeted or what? I recall hearing stories of these things shedding the covering, or having the covering rip off at high speed...is that true or just a horror story?
I think if I were going to build one, it would be fully sheeted w/ 1/16? (or would that be un-necessary? )

Cyclic Hardover

My Feedback: (3)

If you go back and do a good search, you'll find a guy who posted some great pics of his sheeted version.You genrally don but there is a guy who sheeted one. I kind of liked it.

evan-RCU

145-150 max level. 155-160 maybe in a dive at the radar gun. I belive in breaking an engine in like you are going to fly it. If yo do it'll be tight and not want to get onto the pipe(full Pipe) with more than a 8X9, might only take a 8X8. After break in a 8X9 will get you some good speed. There are many stories about the covering and Jeff Gilbert say's to use coverite and not Monokote as the Monokote doesn't hold up. That said I've never heard or seen of someone that has actually had the covering come off. I had Monokote on mine for 4 or 5 seasons with no problems. I rebuilt it 3 years ago and sheeted the L.E.'s and still have Monokote on it. I use the flouresent yellow which is a but thicker than the regular monokote and much thicker than the metallic Monokote.

Mike Connor

My Feedback: (5)

I would start with a 9x8 prop because of the rpm range of your tuned muffler. Radar showed my Dust at 135 mph turning a 9x8 16,000 rpm static. It took 18,000 rpm plus to break 150 mph in level flight.

The only problem I had with my un-sheeted MonoKote covered Dust in over 100 flights was landing damage. Keep clear packing tape handy at the field plus start with a strip or two down the middle. I could recover the bottom in 10 minutes after cleaning the fuel off and it was necessary every so often.

Lomcevak Duck

My Feedback: (14)

Mine is unsheeted and the only problem I have is punching a hole through the bottom on landing or tearing it slightly on a rock. No biggie, easily patched.

proptop

My Feedback: (8)

Thanks for the covering info guys...[8D]

HighPlains

My Feedback: (1)

The difference between going 150 and 175 is that it takes almost 60% more power to go the extra 25 mph.

rmenke

My Feedback: (13)

Xardas

IMHO, your best streight line speed will be around 140-150 which will look like 190 with these little guys. Nothing supprises me much anymore with some of the things I would consider as dog egines warmed over and becoming fast. A great grinder can do wonders with about anything. ENJOY

Xardas26

By the way, this little sucker came out very nose heavy with that motor even though the receiver battery is all the way in the back. I'm gonna have to add 2 oz of stick-on lead to the tail to have the CG right in the middle of the CG range. The manual suggests to paint all wood parts and the leading/trailing edges with Balsarite. Does the covering adhere better or why is it recommended to to that?? Also, is it hard to hand launch these Deltas? I heard composite deltas like whips and phenoms are harder to launch, but I have no experience with deltas.

Mike Connor

My Feedback: (5)

Nose heavy is normal with a 46 engine. Make sure it balances towards the rear of the recommended range for best results. You should still be under 3 lbs with the lead.

I did not use Balsarite on either of mine. I relied on the over lapping covering sticking to it self with the seams pointing back so the wind can not get under them.

I had someone hold the wing tips with the nose pointed 30-45* up and just let go at high power. I have seen pictures of people launching their own but much wind could make that dangerous.

[email protected]

I moved my MVVS Q-500 back 1/2" & my Dust balanced slightly ahead of rear balance point.

I used an aluminum AMA safety nut & 500 mah battery pack was behind rear spar & never added any weight to balance.

I also used Balsa-Rite & covering sticks really well & was easy to apply.

Hope this helps, Mike

evan-RCU

Yes to all the above especially Mike's covering technique. I have a MVVS Q500 motor rear exhaust and moved it back and she balanced perfect. Easy to lauch with the rear exhaust, hold the pipe, give it full power an a slight toss and away it goes. I've heard of all kind of lauches from grasping it bettween the rear fins to a noomerang type wing tip flip....

Lomcevak Duck

My Feedback: (14)

For launching, i walk out holding it by the wing tip in my left hand, letting it hang down by my side. I give it full throttle and let go as I raise my arm up and in front of me. It's super light and just accelerates like crazy from a dead stop.

Xardas26

thanks for the info guys. I think I'm gonna start off with a 9x7 APC to have more thrust for the take offs, and then later switch to a 8.75x8. 5 or something. I'm gonna post some more pics soon.

Rudeboy

I agree... 150 to 175 is one hell of a leap. But even if it only does 150, there's nothing like the sight of a Dust bending under the load of one of those 150 mph pull-outs! You can pull a 6 feet radius turn out of a "terminal velocity" dive with one of these things, without having to worry about structural integrity. It just looks odd

flyinbr

Hi PropTop
If I get 150 out of mine??? with an OS46 I'll be happy. Can't wait for the snow to go away.

evan-RCU

Sorry to say that you won't. 135 tops, 140 in a dive...

People come up with some pretty wild numbers. You'll even see some people saying they got 160 or 170 and then you find out it was with the wind and straight down in a dive... A Nelson tweeked right with the right prop will probably get you to 165 level and that's the best there is.

When you consider what we are doing here 150 out of a few fiberglass rods with a $100 engine is pretty amazing...

proptop

My Feedback: (8)

Hey B-R! Looks good [8D]
Is that some of Chuckles graphics I see?
Don't think the snow's going away any time soon [:'(] we got another foot and a half yesterday over here...so I will be flying my float plane off the snow if it warms up a little...we gotz wind chill of -15 right now.

flyinbr

I can live with 135 for now. This is my first DD and don't know how fast it will go. It's got to be faster than my ultrasport 40.
Yea PropTop Chuckles did the graphics for me. I'm verry happy with it. Later

Clean

If you want to go delta fast extra cheap, build one of these

It's a SPADDawgs Bulldawg. I've got sound recordings at home somewhere of it doing 131 in that configuration, well, 8x8 prop.

Rudeboy

flyinbr,

What brand of pipe is that on the Dust? Looks good! How does it perform?

If you want a little more rpm out of the OS, you can raise the exhaust timing some to make it a little more pipe-suited. 165-170 degrees or so... Don't overdo it though.

Xardas26

hey flyinbr,

your diamond dust looks awesome, I love the drop design. I'm thinking about covering mine with yellow monokote, and putting some red flames on it. On Meta it looks pretty cool.

By the way, how did you mount the tuned pipe to the fuselage? I was gonna use a Dave Brown Hush clamp, but since the Rossi is a side exhaust motor there is no solid spot where I could attach the clamp to.

Xardas26

Here are the meta pics.