RE: DL-50 engine

RE: DL-50 engine
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RE: DL-50 engine - 5/14/2008 9:46:34 AM

peso

Posts: 99
Joined: 12/20/2001
From: Stockholm, SWEDEN
Status: offline

My new DL-50 runs well but sometimes kicks back when started. I use a chicken stick. It kicks so hard that the propeller is damaged. This is something that has never happened to me with my other gas engines.
I have checked the timing and it seems to be 28 ˚ before TDC. This is according to the recommendations. On the other side I am surprised that it is supposed to fire so early. My ZDZ engines fire much later when the propeller is moved slowly past TDC.
Could it be something that I have misunderstood?
/PO

(in reply to platero)

Post #: 1776

RE: DL-50 engine - 5/14/2008 9:59:34 AM

pupmeister

Posts: 148
Joined: 1/20/2003
From: MaitlandNSW, AUSTRALIA
Status: offline

quote:

ORIGINAL: peso

My new DL-50 runs well but sometimes kicks back when started. I use a chicken stick. It kicks so hard that the propeller is damaged. This is something that has never happened to me with my other gas engines.
I have checked the timing and it seems to be 28 ˚ before TDC. This is according to the recommendations. On the other side I am surprised that it is supposed to fire so early. My ZDZ engines fire much later when the propeller is moved slowly past TDC.
Could it be something that I have misunderstood?
/PO

Make sure you have your prop mounted in the correct orientation. When I first tried to start mine I had the prop mounted out by 90deg and this made it extremely difficult to start and when I could get it to fire it seemed to backfire. As soon as I turned the prop 90deg it started on the first throw without any problem.

Cheers
Pupmeister

(in reply to peso)

Post #: 1777

RE: DL-50 engine - 5/14/2008 3:33:57 PM

frieshoo

Posts: 712
Joined: 1/3/2002
From: Fries, VA, USA
Status: offline

quote:

ORIGINAL: platero

I am thinking in test a Mejzlik 24 x 10 this week end because with the Top Flite 22 x 10 the plane, Yak 54 GP, goes very fast and keep flying at low RPM, so landings are so longs. What do you think about?

The Vess 23A, Xoar 23x8, and MSC 23x8 are excellent breaking props.

I tried a MSC 24x8 prop on my best DL and only got about 6000rpms out of it... To much prop, to much heat, etc... 23x8 of any good prop is the best prop for the DL50.

A Mejzlik 24x10 likely will give you the same breaking effect as the 22x10. The common part is the 10 pitch of both props. The added disc effect of the Mejzlik will help, but you will still notice the 'fast'.

_____________________________

Dennis Anders AMA 625293
Lowgap Flying Club Lowgap, North Carolina

(in reply to platero)

Post #: 1778

RE: DL-50 engine - 5/14/2008 5:40:10 PM

wavy777

Posts: 268
Joined: 11/1/2004
From: Oxfordshire, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: jerrysu29

When you talk about negative expo, and the other guy says he uses about 30%. This can be very confusing to most who have Computer radios. JR neg. expo makes the center more sensitive and pos. expo makes the center less sensitive. Know on the other hand Futaba is just the opposite neg.expo desensitizes and pos. expo senisitizes the stick at center. I try not to asume every body knows this, so could you guys explain a little more in detail to which radio set ups you are using. I'am sure evey body else has the same question. The new guys to 3D could get them selfs in a world of hurt by interperating this incorrectly, Just a few in my heard.
One of our members just got a DL50 and has had the same problems with his stock muffler.

I suggested a negative expo of 30% at point 3 on a JR9XII (9303) throttle curve. Just for the record i now have 3 DL's and my findings so far are:

1 LSN is always set a little too rich from the factory, and need leaning a little after the first couple of tanks through the motor, very small amounts at a time....
2 Bob Pastorello's manual choke setup is the easiest and lightest way to do that. See his website.
3 The STD dl silencer is LOUD LOUD LOUD, they react very well to headers and tuned pipes designed for the DA50, i have seen 7800 rpm on an ES piped DL with a 23 x 8!!!!!
4 Best prop for me has been the Mejzlik 23 x 8, if a little noisey.
5 All my engines are running on 45:1 fully synthetic 2 st motorcycle oil from Halfords (UK motor store).
6 All my engines have been run in, in the air...no bench running.
7 They're fantastic!!!

CHeers

W

(in reply to jerrysu29)

Post #: 1779

RE: DL-50 engine - 5/14/2008 5:43:10 PM

wavy777

Posts: 268
Joined: 11/1/2004
From: Oxfordshire, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: jacklegchris

Mine weighs in at 14.3 lbs without fuel. The problem I've had here is always being under powered. A 40 size plane with the top recomended engine is just not enough. I have to use 60 size engines to get the power needed say a .91 4-stroke. I'm hoping that this will not be an issue with my edge. I'm tired of always being under powered.

UNDERPOWERED!!!

Hope you have a high cloud ceiling on the maiden......

My DL's pull 17 - 19lb airframes round like crazy...

Your gonna have fun!!

(in reply to jacklegchris)

Post #: 1780

RE: DL-50 engine - 5/14/2008 6:30:48 PM

jacklegchris

Posts: 83
Joined: 2/9/2006
From: Livingston, MT, USA
Status: offline

wavy, my elevation is 5000' asl. I loose roughly 5% performance every 1000'. That's 25% plus thinner air. That's my situatiuon. But yeah, that edge should have all the power I need. Maiden hopefully Sat.

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KJV THAT''S THE BOOK FOR ME

(in reply to wavy777)

Post #: 1781

RE: DL-50 engine - 5/14/2008 7:29:47 PM

wavy777

Posts: 268
Joined: 11/1/2004
From: Oxfordshire, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: jacklegchris

wavy, my elevation is 5000' asl. I loose roughly 5% performance every 1000'. That's 25% plus thinner air. That's my situatiuon. But yeah, that edge should have all the power I need. Maiden hopefully Sat.

Damn, thats high compared to me at 100' asl.....let us know how it go's....

(in reply to jacklegchris)

Post #: 1782

RE: DL-50 engine - 5/15/2008 2:40:00 AM

platero

Posts: 225
Joined: 2/15/2004
From: Buenos Aires, ARGENTINA
Status: offline

Thanks a lot for the info, I will see

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(in reply to frieshoo)

Post #: 1783

RE: DL-50 engine - 5/15/2008 2:52:31 AM

Nelvick

Posts: 35
Joined: 2/16/2008
From: Avon Park, FL, USA
Status: offline

Well. Thats the progress of my project. I start the engine today and was so nice!!! Exelent sound and power. i will do 1 more tank on the floor for braking.
I am using 2 Lipo batteries with 2 switches and 2 Align 6A regulators conected to a Y connector and from the conector to the Reaciver. Thats is correct? its my first time working with a giant scale. Almos is working and dont blow nothing yet.
In my setup i have 4 HS-5645 2 HS-5965 1 HS 645 and 1 futbaba 3001 with a Spectrum AR7000. Somes pictures here.

(in reply to platero)

Post #: 1784

RE: DL-50 engine - 5/15/2008 3:12:31 AM

Bosco2

Posts: 113
Joined: 10/17/2004
From: Winston Salem, NC, USA
Status: offline

Nice photos,
The standard is to connect one regulator to the battery port on the reciver and the other regulator to an auxilary port on the reciver,
This is the way I have done my planes,

If you use a Y connector and one of the two system fails then it would take out the other system and you would have a complete failure,

_____________________________

Having more fun than a human being should be allowed to have.

(in reply to Nelvick)

Post #: 1785

RE: DL-50 engine - 5/15/2008 12:56:35 PM

gpar

Posts: 135
Joined: 9/22/2003
From: santander, SPAIN
Status: offline

Anyone could tell me the initial needles set up in the dl-50?.

After four hours breaking in I'm getting only 6500 rpm with a Menz 22x10 when other guys in identical conditions got 6900-7200 rpm.

My H needle is 1 1/2 turns and L is 1 1/4 turns, which was my initial set up. I played the H 1/8 back and for without any improving in top rpm.

Should I check the ignition timing ?

Should I go flying to get more breaking in time?

(in reply to Bosco2)

Post #: 1786

RE: DL-50 engine - 5/15/2008 2:14:59 PM

Nelvick

Posts: 35
Joined: 2/16/2008
From: Avon Park, FL, USA
Status: offline

Yes. i understand that this engine need almos 12 tanks for get the total braking and get the full power.

(in reply to gpar)

Post #: 1787

RE: DL-50 engine - 5/15/2008 6:54:05 PM

Super08

Posts: 290
Joined: 12/17/2007
From: Fort McMurray, AB, CANADA
Status: offline

I'm getting about 6500 with an Xoar 22x8 so your right in there. Mine doesn't have much time on it either.

(in reply to Nelvick)

Post #: 1788

RE: DL-50 engine - 5/15/2008 7:15:16 PM

FlyingGreg

Posts: 567
Joined: 1/21/2002
From: West Chester, OH, USA
Status: offline

I started with a MA 22x8 and Lawnboy 32:1 and was only at 6400-6500. When i swithced to the Vess 22A and 50:1 synthetic, Bell Ray, after tweaking the HS needle I was hitting 7400 on the ground. Broke my vess and reordered. Probably could have gone to 22B or 23A, but stuck wiht the 22A since it's a bi plane. I had more than enough power with the MA turning 6400. I have only about a gallon thru it at 32:1 and two tanks of the 50:1. Runs great and starts easy.

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(in reply to Super08)