Anybody know what the manufacturer published "static lbs thrust" is for the DA using whatever the manufacturer deems is the best prop, the best weather/altitude conditions and the other ideal factors that go into these number games.

That ends this RPM numbers game once and for all and makes a clear way to compare engine to engine. Eventhough they are the best-case scenario...since every manufacturer is doing "best-case" and doesn't want to be sued for false advertisement....it makes comparisons easy.

me and a friend checked his da 50 with mejzlik 23x8 spinning about 6600 rpm and got 26 lb on digital fish scale...also tried a name brand wood (can't remember which one) and got about a pound less pull.

Sounds about right. I prefer to fly at a power to weight ratio of 2:1. So that means I would not use this motor for any plane over 13Lbs-14 in a stretch.

Most of these 30% planes are coming out around 15-16lbs.... thats why I'm waiting for an engine I can use...or a lighter plane....

Fly mostly electrics huh?

Only two electrics. I mostly fly profile fuses where I can get an over-powered 4stroker pulling a plane that is 3.5lbs. max.

Yep... that'll spoil ya...

Seriously though I think you are missing out on a LOT of great planes/engine combos simply because they don't offer exactly 2:1 p2w...

But... if that's your buying point...

Heres a post of a guy getting 12.5Lbs of thrust on a Saito100....thats nearly half as much as what someone is getting on the DA.

http://www.rcuniverse.com/forum/m_350358/tm.htm.

And, the DA is suppose to be the best.

We need to press our manufacturers. I'm looking for someone who can build a 50-56cc class engine that can deliver @ least 30+Lbs static thrust (i'm hoping the BME 55?) or a plane manufacturer that can build a 50cc plane @ 12-13lbs (maybe Extreme Flight?).

I need to hover @ 20-25% max and I need to pull out at 2 times acceleration @ less than 50% throttle. Otherwise its just no fun, no fun at all and you miss being able to do a good 15% of things you could with that power that just don't work with less power.

That's why some people fly electric planes and small profile planes. It's too bad you have to have that much power to have fun. Less power does make it more challenging and difficult. That's part of the game. I'm pretty sure most engine manufacturers and plane manufacturers aren't holding anything back. They're giving modelers the best they can economically produce for the average guy. I'm glad I enjoy flying my Wild Hare Edge and Brison 3.2. I guess it doesn't take much to make me happy.


P.S. Flying a 50cc size gasser is waaaay more fun than flying a 6.25 pound plane with a Saito 100

It depends on what floats your boat....
I've seen 3 folks flying Wildhares at my previous field with 50cc DA's, and it looked pretty boring to me.

Given a Saito is 1.2 lbs and puts out 12.5lbs of static thrust, we should be expecting that a 3.1lb motor put out 32+lbs of thrust if they were linear. I bet we see it within 5 years....probably within 2.

Pretty slim chance. Unless they start using some of that there anti-gravity stuff. You're not comparing apples to apples. Comparing glow/nitro engine power and weights to gasoline engine power and weights is a waste of time. If a guy had to have to have 2-1 power to weight ratio, you could put a 80cc engine in a 50cc size plane. You know what? It won't fly any better than it did with the 50cc. Now it's more than 2-1, but it's too heavy.

Age, agenda, inexperience.

Hardly, if the BME 55 can deliver 7000-7200 on a 24x10, it would be deliver well over 30lbs of Thrust and shave a lb off the total weight.

There you are! You just solved your own problem! If the BME 55 is as good as you say, several of us will have one. I'm #33 on the list. Where are you on the list?

DA told me that a Bolly 23/8 is the best combo. Guess they would know best, which is what I use.

I didn't get a number...

Guys,
What is the DA50 plug/wrench size?

Pretty sure it's a 14mm.

Hey all

Fired up my new Fiddy today.I am running a P.T.Model 22x8 prop
(they can be seen at http://www.troybuiltmodels.com/Propeller.htm This is my first gasser. It seemed to be running quite well with the factory needle settings,(to my inexperienced ear).
When I tached it ,it was only getting 5000RPM at sea level which is much lower than I was expecting.
Does anyone have any experience with PT model props?
Are they a high load prop for a 22x8 and therefore not suitable for break in?
Is it normal to to get very low RPMs for the first couple of runs?
Or is it more likely the needles are way out?
Is this to many questions for my first post?
Any advise would be greatly appreciated

Howard.

I think you better adjust your needles. I don't have any experience with that prop, but when my Da-50 was brand new I got 6750 with a NX 22x8 prop also sold by TBM.

My DA50 (~1gallon-old) turns a 22x8 MenzS @7350rpm where 12.1kg (26.8lbs) of thrust is produced (measured by a 100lb digital fish-scale). Still on 1:32 oil, though.

It can idle @1440rpm (low idle) or 1800-1900rpm (flight idle) steadily. Transition is very crisp.

Exhaust system is Chip Hyde Quiet Pipe on a 320mm-long "?" header.

Hope this helps.

if all goes well i will be trying a tune pipe on the Brison 3.2 in the April time frame. I think i also have one of the RC showcase black cans in the stash to try also. Results to follow:

You have some interested Brison owners watching for your results.

marzo91
i know what u mean this has been hard information to come by in my years of having 2 Brison 3.2. I only have one left as my buddy bought my WH Extra a few years ago with the other 3.2 on there. Here are some numbers in my notebook for the motor i have now. Its about 5 years old and still running strong.

23 x 8 Mejzlik 6240

22 x 8 Bambula 6750-6800
22 x 8 mejzlik 7100
22 x 8 zinger pro 7500

22 x 10 RCS 6300
22 x 10 Menz 6450-6500
22 x 10 Futz 6050

21 x 8 bolly 8400
21 x 10 7350-7400 Mejzlik
21 x 10 6700-6800 Menz

87 DB at 25 feet out
J & H peacekeeper (2 out pipes not restrictive at the tips no tips cut off)


I don't think i have but 22 x 8 menz and mejzlik still around for the 3.2 as that has been my preference. I have bolted on other props that were at the field but i do not have those numbers so i dont want to rattle off whats may be wrong in the brain.

http://www.rcaerobats.net/Mueller/Mu...tomHeaders.htm

this link above is what is going to be the biggest help in getting me that much needed not having to make myself header. Just a little over 50 bucks shipped.

DA-50 w/KS-86 Canister (rear dump) w/Amsoil 100:1

Xoar 22x8 6720 RPM
Vess 22A 6780 RPM
Xoar 23x8 6090 RPM

DA-50R with Bisson Pitts Muffler with muffler tips cut off about 1 inch, using H1R 31:1 oil:

Xoar 22x8 = 6,970 RPM's

Vess 22B = 6,980 RPM's

My DA50 is rated for 7,000 RPM's