Ripmax Harmony Twin Engine OS46LA  
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Ripmax Harmony Twin Engine OS46LA - 4/19/2007 11:08:47 AM   
Mikael-OEMF


 

Posts: 14
Joined: 4/19/2007
From: Oerbaek, DENMARK
Status: offline 		Monday 16th of April was the day when my new Ripmax Harmony had its maiden flight. Having less than one years experience as a modelaviator. This was huge for me.
It is my first model with twin engines and the retracts are also new to me. The difficulties that I have had were mostly about the retracts and the choise of servos for these.

RETRACTS:
1: The instruction book pictures ordinary servos for both nose and main retracts. I had to buy a special retract servo for the mains and the a heavy duty servo for the nose gear.
2: The links are plastic. One broke during the initial taxi test on the ground. All are now changed to metal links.
3: There is more plastic in the retract linkage. A horn on the starboard main came of during the maiden flight. Result was the wheel just hung loose under the plane. Unlocked and not retractable. Thus my first landing was on 2 wheels. Luckily no damage was done during the landing.
4: The retracts are factory mounted. There is a pin in the retract unit that is neither locked or secured with any form of adhesive. As the plane vibrates a lot due to poor enginemounts. It will come loose. And it did. I had to use force to get the retract unit out to refit the horn mentioned in 3. Result splintered wood in starboard gear mounting plate.

ENGINE MOUNTS:
1: They are predrilled. But for what engines I do not know. OS46AX´s are recommended in the instruction book. I do not have one. But my guess would be that they have almost the same distance between the holes. I had to blind of the holes with 3 mm round wood and epoxy glue. Furthermore I had glue in 2 pieces of 1mm plywood due to the large space in the precut engine mount. It would have been nicer if they had just made a firewall and then had supplied a standard nylon or alloy engine mount.
2: It is a very tight fit to get the tanks in. I thought I was being carefull to wipe of excessive epoxy when I glued it together. But there was a bit left making it even harder to get one tank in, than during the prefit. I punctured a tank.
3: Vibrations! There are a lot of those. Before I close the cowls. I will have to dismount the engines and resecure all screws as they are coming loose. Currently I am thinking of a trip to town. I want to try to mount one of those alloy rails for drapes to see if I can reinforce the engine mount and reduce those vibrations.

Here is a link to a picture of the Harmony on display at the opening day of this season in our club.
http://www.oemf.dk/070407%20Standerhejsning%20(5).JPG

It flies well. And it is such a thrill to hear those 2 engines. All of a sudden my 2-stroke trainer engines are huge. I am waiting for better weather. My second flight was perfect. Perhaps I can enjoy the third. 2nd had the heart rate of first flight.
If You have 2 0.46 engines from Your trainers. Then buy one. I will continue to write of what I learn from mine here.

Anyone else out there who has got a Harmony?
Best regards
Mikael
       Post #: 1

RE: Ripmax Harmony Twin Engine OS46LA - 4/19/2007 2:01:09 PM   
DelRay


 

Posts: 211
Joined: 4/12/2007
From: Cedar Rapids, IA, USA
Status: offline 		Mikael,Nice looking plane,and congrats with the maiden flight, it's a rush ,for sure. I hope you get the vibration problem sorted out, thanks for the link to the pic. I'm not at all familiar with this plane, but like you mentioned, it sounds like all of your problems are with the less than adequate motor mounts. I would use a piece of aluminum .125 flat stock stock, drilled and tapped for the bottom side of the motor mounts if you don't modify the firewall to use the standard mounts available.
Jim

_____________________________

AMA # 173709 Have traveled to the East
I.M.A.A. # 4971 Amateur call WB0KFB

(in reply to Mikael-OEMF)
       Post #: 2

RE: Ripmax Harmony Twin Engine OS46LA - 5/15/2007 7:39:06 PM   
orygg


 

Posts: 126
Joined: 7/28/2006
From: MossØstfold, NORWAY
Status: offline 		Hello i have one me to,gone use to irvin 40 2stroke think it gone fly fast, verry ise to bulld to

(in reply to DelRay)
       Post #: 3

RE: Ripmax Harmony Twin Engine OS46LA - 5/15/2007 10:42:39 PM   
Ed_Moorman



Posts: 3648
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline 		Very nice looking twin. Wish they were available in the states.

_____________________________

Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to orygg)
       Post #: 4

RE: Ripmax Harmony Twin Engine OS46LA - 5/20/2007 9:05:16 PM   
orygg


 

Posts: 126
Joined: 7/28/2006
From: MossØstfold, NORWAY
Status: offline 		Hello i dont like the gear on my plane,plastic

(in reply to Ed_Moorman)
       Post #: 5

RE: Ripmax Harmony Twin Engine OS46LA - 6/20/2007 6:20:07 PM   
orygg


 

Posts: 126
Joined: 7/28/2006
From: MossØstfold, NORWAY
Status: offline 		Hello proplem getting retraks working,do you have som pics off it,only 1gear inn nr2 geting inn then coming oute help

(in reply to orygg)
       Post #: 6

RE: Ripmax Harmony Twin Engine OS46LA - 7/7/2007 12:14:08 PM   
orygg


 

Posts: 126
Joined: 7/28/2006
From: MossØstfold, NORWAY
Status: offline 		Hello do you have pics off the retraks main,nede help on maine gear,watt retraks servo do you use,i have retraks servo butt gear gett inn then aute,have don everiting nede help best regards orygg

(in reply to Mikael-OEMF)
       Post #: 7

RE: Ripmax Harmony Twin Engine OS46LA - 7/14/2007 3:50:19 AM   
orygg


 

Posts: 126
Joined: 7/28/2006
From: MossØstfold, NORWAY
Status: offline 		Hello and ready to fly my harmony,pics is coming

(in reply to orygg)
       Post #: 8

RE: Ripmax Harmony Twin Engine OS46LA - 8/19/2007 10:17:46 AM   
Mikael-OEMF


 

Posts: 14
Joined: 4/19/2007
From: Oerbaek, DENMARK
Status: offline 		Hi there orygg
Sorry for the long responce time. I am a marine engineer and have been at sea for the past three months.
But I use a Hitec Optic 6 transmitter. I started out with standard servos for the retracts. The one for the main gear was too high and ruined some of the wood and covering. And it just didn´t move far enough for the wheels to come in and out properly. So I had to buy me a special retract servo for the main gear. For the nose gear a standard servo proved to be too weak. So I had to buy a larger and stronger servo for that too.
Hitec Servos
Standard: HS 325 HB
Nose gear: HS 475 HB
Main gear: HS 75 BB
I have tried to adjust the servos so they do not humm. That is they keep pulling and thus using power. But then they don´t lock properly. I will ask for a solution I saw on another model. When I meet that guy again. He had a back-up power unit. 2 batteries and an alarm for change over to back-up battery. If the alarm was audiable or visual I do not remember. But I want something like this for my Harmony.
I had my Harmony out for a presentation in the club before I left for sea. It was utter failure. Nose retract. First a broken plastic linkage. Then a brass rod broke. It is the one for turning the nose gear. The one that goes in the slide. I´ll try seing if a bolt will do the trick.
3 months off the sticks. I am back to flying my trainers untill I feel confident enough to have another go with the Harmony.
But I´ll be back with an update. Hopefully within the next 2 weeks.
Got me a digital camera now. Pictures coming when I´ve finished reading the manual.
Best of flying weather for You all
Mikael

(in reply to orygg)
       Post #: 9

RE: Ripmax Harmony Twin Engine OS46LA - 11/13/2007 11:07:39 AM   
orygg


 

Posts: 126
Joined: 7/28/2006
From: MossØstfold, NORWAY
Status: offline 		Hello hade my 1 flight withe harmony on sunday, flying par off irvin 40 2t lots off power
4 point, knif edge no problem att all, plane is flying beutefull,this is a god plane 1 twinn best regards olav

(in reply to Mikael-OEMF)
       Post #: 10

RE: Ripmax Harmony Twin Engine OS46LA - 3/10/2008 4:39:46 PM   
orygg


 

Posts: 126
Joined: 7/28/2006
From: MossØstfold, NORWAY
Status: offline 		hallo here is mine harmony,a god first twinn it is fast,stable as a rock , i have 2 40 irvin 2stroke on it lots off power,her is som pics best regards orygg

Attachments
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(in reply to orygg)
       Post #: 11

RE: Ripmax Harmony Twin Engine OS46LA - 4/29/2008 9:18:13 AM   
Mikael-OEMF


 

Posts: 14
Joined: 4/19/2007
From: Oerbaek, DENMARK
Status: offline 		Looks too good Orygg. Makes me want to repair mine.
Had an engine failure last year. Made a turn the right way and of reasons unknown I did one the wrong way causing a spin and what can only be descriped as an uncontrolled landing. Outfield behind bushes and a slope. Minor damages only.
Made me stop that project. Have bought better engines. I am changing the OS46LA´s to OS46AX´s. Will make some reinforcements on motormounts. The wooden boxes are coming apart.
My largest problem is the statistics though. 3 take-offs and 2 landings. [)]
This can only be improved with a good summer. And first a little work.
May You have nice and calm wheather and lets have a Harmony-summer.

Mikael

(in reply to orygg)
       Post #: 12

RE: Ripmax Harmony Twin Engine OS46LA - 4/29/2008 12:20:53 PM   
orygg


 

Posts: 126
Joined: 7/28/2006
From: MossØstfold, NORWAY
Status: offline 		Hi i Had an engine failure me to butt no problems, plane turn smod no rudder at all,landing no problems,i have stop bothe enging my selfe and one engin plane still flying god no bad habit at all,best regards olav

ps only ting i want to do is to install air retraks and modifie nacells.i flying knife edge only one meters from the ground,i trust my plane and engin and have done all you can do to test engine from left to right

(in reply to Mikael-OEMF)
       Post #: 13

RE: Ripmax Harmony Twin Engine OS46LA - 4/29/2008 2:10:01 PM   
exocet-RCU


 

Posts: 113
Joined: 1/17/2002
From: Shakopee, MN, USA
Status: offline 		Who makes this kit? I notice the Japanese characters for "Harmony" on the wing. Is this a Japanese kit? If so, I will have to have my friend there find one for me...... Very cool plane. Looks fast!

Tim

(in reply to orygg)
       Post #: 14

RE: Ripmax Harmony Twin Engine OS46LA - 4/29/2008 2:47:16 PM