logo
Thread Tools
This thread is privately moderated by Biff, who may elect to delete unwanted replies.
Old 04-30-2019, 06:40 PM
Garyr is offline
Find More Posts by Garyr
Registered User
Canada, ON, Ottawa
Joined Oct 2012
85 Posts
DA60 with MKS can, rear exit.
Falcon 24 x 9 cf. 6700rpm
Mej 24 x 8 EVO 2 7000 rpm.

Flying: Mej was slightly slower speed horizontal. Vertical was forever...slow and steady.
Vertical downlines were noticeably slower than with the Falcon. Better 'braking'.

Cool day, around 50F. Elevation 600 ft ASL.
Garyr is offline Find More Posts by Garyr
Reply With Quote Quick reply to this message
Sign up now
to remove ads between posts
Old 04-30-2019, 09:21 PM
Mithrandir is offline
Find More Posts by Mithrandir
TEAM FUTABA
Mithrandir's Avatar
High Desert California, USA
Joined Jan 2006
7,931 Posts
DA215 @ 5850 rpm, 34 x 12, 80 mph at 3500 feet and 72 deg f, head temp 310
Mithrandir is offline Find More Posts by Mithrandir
Reply With Quote Quick reply to this message
Old 04-30-2019, 10:07 PM
orthobird is offline
Find More Posts by orthobird
I hammer at 1500 feet
orthobird's Avatar
United States, LA, Shreveport
Joined Apr 2012
8,178 Posts
Quote:
Originally Posted by Mithrandir View Post
DA215 @ 5850 rpm, 34 x 12, 80 mph at 3500 feet and 72 deg f, head temp 310
so please post pictures!!! we want to see
orthobird is offline Find More Posts by orthobird
Reply With Quote Quick reply to this message
Old 08-29-2019, 03:07 PM
kaboomski is offline
Find More Posts by kaboomski
In thrust we trust!
kaboomski's Avatar
Finland, Uusimaa, HKI
Joined Feb 2010
254 Posts
ZDZ-140

I did some tuning on my ZDZ-140 today. The engine has 4,5 hours on it. Still spits a lot of black residue. I peaked the engine and turned back a bit. After that I got 6700 on the ground with Falcon 29x12 and KS 1080 pipes. The temperature was 22C, altitude 122 meters ASL, air pressure 1014 hPa and humidity 60-70%.

My flying buddies with ZDZs said that I can expect to have some 200 rpm more once the engine is completely broken in.

--kaboomski;
kaboomski is offline Find More Posts by kaboomski
Reply With Quote Quick reply to this message
Old 09-01-2019, 10:07 PM
Aeroplayin is online now
Find More Posts by Aeroplayin
Registered User
Aeroplayin's Avatar
South Pasadena, Florida
Joined Mar 2009
1,323 Posts
It takes about 15 HP and 11.23 kW at the shaft to turn a 29x12 6700 RPM. This is also about 37.6 kilos of thrust (82.9 lbs). The tip speed is a bit high though and in the zone where you'll loose a little efficiency (Mach 0.75).

A 30x12 will give you the same thrust at 6325 RPM and the 32x10, which was the prop we settled on with the DA-150 (Mejzlik), will deliver the same power and thrust at 6180. Not really any tip speed change so they all will rip.
Aeroplayin is online now Find More Posts by Aeroplayin
Reply With Quote Quick reply to this message
Old 09-02-2019, 07:55 AM
Raven1978 is offline
Find More Posts by Raven1978
Fly low, wheels up !
Canada, ON, Kingston
Joined Sep 2015
83 Posts
Da100L w/hype pipes, falcon 28x9.5 =6780 static and 7320 unloaded
Raven1978 is offline Find More Posts by Raven1978
Last edited by Raven1978; 09-02-2019 at 04:06 PM.
Reply With Quote Quick reply to this message
Old 09-04-2019, 05:01 PM
RCAddiction is offline
Find More Posts by RCAddiction
Registered User
RCAddiction's Avatar
United States, FL, Sarasota
Joined Jan 2006
1,071 Posts
DA100L
stock compact mufflers
Shell 93 octane (unleaded w/std 10% ethanol), 40:1 Redline and Sta-Bil
20' ASL
92 degrees F, >80% RH
Mejzlik 28x10
6475 rpm ground
7440 peak rpm in the air via telemetry, dragging a 36% PAU Edge 540T
RCAddiction is offline Find More Posts by RCAddiction
Reply With Quote Quick reply to this message
Old 09-12-2019, 09:38 AM
Threepete is offline
Find More Posts by Threepete
Registered User
Threepete's Avatar
United States, OH, Beavercreek
Joined Jul 2019
32 Posts
Just started my new DLE 55 RA for the first time. Xoar 22x8 laminated prop, JTec pitts muffler, Tru turn Spinner, 90 octane pure gas (no ethanol) Stihl HP mixed at 40:1--- 7480 RPM on the ground.
Threepete is offline Find More Posts by Threepete
Reply With Quote Quick reply to this message
Old 09-12-2019, 01:59 PM
Aeroplayin is online now
Find More Posts by Aeroplayin
Registered User
Aeroplayin's Avatar
South Pasadena, Florida
Joined Mar 2009
1,323 Posts
I've been following this thread a long time and really learned a lot from the work of Pe and all the great test data Brad was posting years ago. But since Biff mentioned when this thread was started that understanding power expectations from motor/canister/muffler/prop combinations would come from real world result, I thought I'd post results from my latest "motor" project as well since electric power has become more popular than it has been in the past. We have an electric power thread on RCG and it has almost 1.3 million views so maybe someone here would benefit too.

A StinGR 3.33:1 Gear Reduction with custom wound Scorpion 5035 motors:

27x12L PT Carbon with a 515Kv on 44.4v = 6179 RPM
28x13 C2E Falcon with a 525Kv on 44.4v = 6300 RPM
28x12 Xoar PJN with a 540Kv on 44.4v = 6480 RPM
28x12 LF Mejzlik with a 460Kv on 51.8v (14S) = 6411 RPM

The gear reduction efficiency to the shaft with these props is 90.08% so for example the 6411 RPM with the 28x12 Mejzlik is 192A on 14S but the non-geared equivalent of 11.2 kW. A YGE 320A controller was used for this in a 105" Skywing Edge.

I also tested a 3-blade Xoar 24x10x3 PJI-E (199g) on a 515Kv motor at 44.4v because I'm thinking about a scale 3-blade on a 91" Extra or Edge. I got 6180 RPM and only 135A or the non-geared equivalent of about 152A and 6750W. It's developing the same energy at the shaft as a 27x10 of the same weight to the same RPM. It will pull about 44 lbs on the Ralala too and more when it cools down a little here.
Aeroplayin is online now Find More Posts by Aeroplayin
Reply With Quote Quick reply to this message


Quick Reply
Message:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
DA85 on pipe! Results please. sprice50 Gas Engines 588 11-09-2012 11:41 PM
tourqe of motor 2robinhood Gas Engines 8 06-04-2011 06:20 PM
Real world results with A123 pack. wildhare Onboard Electronics 161 06-15-2008 11:51 PM
Real World Tail Rotor Failure and landing Kiwi Full Scale Huckin' 1 02-18-2008 08:05 PM
truly incredible hillmanr2 Humor 8 04-12-2007 07:56 PM