RE: Sundowner from Hangar 9  
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RE: Sundowner from Hangar 9 - 1/19/2008 8:41:16 AM   
kaastrup



Posts: 102
Joined: 10/8/2004
From: Aarhus C, DENMARK
Status: offline 		Hi there

Stay cool :-)

Tx for that many answers...

And just to clarify, It is my primary target to go fast. But what I don't understand is, why is the MVVS 45 a bad choise ? If one would like to install a 50cc gasser, in my book it has more power than a DA50 and it is lighter too ?!?!?!?

I know that some poeple are going pretty fast with a MOKI 2.10 - so maybe I'am going that way. I just like the idea of getting a gasser in it, so I don't get all that mess on the plane.

mfuess >> Hare you had any experience in tuning the MOKI 1.80 gasser ?? What could be done ?


_____________________________

Christian Kaastrup
OY-5704

(in reply to mfuess)
       Post #: 176

RE: Sundowner from Hangar 9 - 1/19/2008 12:01:48 PM   
mfuess



Posts: 402
Joined: 9/5/2002
From: Bedford, TX, USA
Status: offline
quote:

ORIGINAL: kaastrup

Hi there

Stay cool :-)

Tx for that many answers...

And just to clarify, It is my primary target to go fast. But what I don't understand is, why is the MVVS 45 a bad choise ? If one would like to install a 50cc gasser, in my book it has more power than a DA50 and it is lighter too ?!?!?!?

I know that some poeple are going pretty fast with a MOKI 2.10 - so maybe I'am going that way. I just like the idea of getting a gasser in it, so I don't get all that mess on the plane.

mfuess >> Hare you had any experience in tuning the MOKI 1.80 gasser ?? What could be done ?


Kaastrup,

I profusely apologize, your MVVS 45 is a supreme engine and it would be your top choice. (I was thinking of another 45 I use occasionally). Your Moki 1.80 is a clean, well made engine. It responds well to tuned pipes and oversized canister mufflers. The only short-comming you "WILL" encounter is, it has a 30.5mm stroke. GREAT for RPM, espscially on a pipe. But it will severely struggle trying to spin up large-pitch props. It's do-able though.

Your MVVS 45 will require long stand-offs to clear the carb, or you could make a cut-out in the firewall for the carb. Either way, your magnesium crankcased, 38mm stroker, has a lot of potential. Thrust for pound, your MVVS 45 will serve you better than any engine on your list. And just wait until you see it on a pipe! WHAT A BEAST! If you don't mind cutting your stand-off box back about an inch, I'd recommend you bolt the engine straight up. I considered an Evolution 45 (MVVS) long and hard. I just didn't want to have to make the firewall to prop hub length come out right, so I went with the BME 50 (which bolted right up). I sort of regret not going with the MVVS 45 though.

Your MVVS 45 has the best port design of any engine available today, bar none. And it's the first "true" magnesium crankcased application specific engine. If you already have this engine, don't waist your time with the others...

(in reply to kaastrup)
       Post #: 177

RE: Sundowner from Hangar 9 - 1/19/2008 3:45:28 PM   
kaastrup



Posts: 102
Joined: 10/8/2004
From: Aarhus C, DENMARK
Status: offline 		Hi mfuess

I already have the engine lying around, but I haven´t run it yet. MVVS does have alu-stand-offs in several lenght, and there are also an option with an GFK plate on the stand-offs, to bolt the engine on. But I will try to measure how much clearence there has to be.

What prop would you suggest for racing on the MVVS 45 and MOKI 1.80 G ???


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Christian Kaastrup
OY-5704

(in reply to mfuess)
       Post #: 178

RE: Sundowner from Hangar 9 - 1/19/2008 4:09:00 PM   
CRG


 

Posts: 104
Joined: 6/1/2005
From: , CA, USA
Status: offline 		From his list you recommended the Moki, until you said: "If I were you, I'd sell off some of those engines and re-invest in a 50cc.".

For pure speed, I think there are probably better airframe choices. But to go as fast as possible with the Sundowner you're going to have to continue on the path of bigger engines, with it's attendant problems. You might consider converting one of your gas engines to alcohol. Cleaning up the airframe will help a great deal also, but takes some work. All the control linkages need to get cleaned up, servos inside, lighter gear, cleaner wheel pants etc.

For sport flying my absolute recommendation is to build it light, with the smallest engine that will do the job for you. I've flown this model at 10.7 and 13.5 pounds, and it's a different animal at the lighter weight.

Craig.




quote:

ORIGINAL: mfuess

Ditto, RPool...

It doesn't matter to me one way or the other. Kaastrup asked which engine from his list, and I recommended one of them from his list. I've flown with ALL of those engines and know them WELL, and still have them. If Kaastrup wants more bang he can always change to another engine later...


(in reply to mfuess)
       Post #: 179

RE: Sundowner from Hangar 9 - 1/19/2008 6:03:33 PM   
asnook


 

Posts: 63
Joined: 5/4/2005
From: herts, UNITED KINGDOM
Status: offline 		Hi All
I am just putting the final assy together and I am very pleased with the Plane, one thing I have noticed is that the Canopy is very hazy on the inside. It spoils the whole plane. Any ideas how to make it clearer, looks like a sort of staining !
Thanks
Alan

(in reply to CRG)
       Post #: 180

RE: Sundowner from Hangar 9 - 1/19/2008 6:23:38 PM   
HighPlains


 

Posts: 2663
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		We used to sand the outside of canopies back in the Formula One days. At that point you couldn't see thru them at all. During the finishing, the last coat was a clear coat which the entire airplane was covered with. After the canopy was sprayed, it was clear again.

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(in reply to asnook)
       Post #: 181

RE: Sundowner from Hangar 9 - 1/19/2008 8:17:36 PM   
mfuess



Posts: 402
Joined: 9/5/2002
From: Bedford, TX, USA
Status: offline
quote:

ORIGINAL: kaastrup

Hi mfuess

I already have the engine lying around, but I haven´t run it yet. MVVS does have alu-stand-offs in several lenght, and there are also an option with an GFK plate on the stand-offs, to bolt the engine on. But I will try to measure how much clearence there has to be.

What prop would you suggest for racing on the MVVS 45 and MOKI 1.80 G ???


I would highly recommend an APC 18x14 prop for the MVVS 45. It has the torque to really spin this prop up. Your Moki 1.8 gasser will probably do best with a 16x12 or possibly 17x13. You will have to experiment with both engines. If I remember, I "think" you need 5 3/4" for your firewall to prop hub length. It's in your manual.

(in reply to kaastrup)
       Post #: 182

RE: Sundowner from Hangar 9 - 2/14/2008 12:57:50 AM   
CRG


 

Posts: 104
Joined: 6/1/2005
From: , CA, USA
Status: offline 		Guys and gals,

The 2008 USRA Sundowner rules will be posted on the website (www.usrainfo.org) this evening. We've tried to tailor this to the bulk of Sundowner owners, if you have a Sundowner we'd love for you to come and get a taste of the racing experience. Some setups will be faster than others, but the goal is to just get involved. If later you want to work on your setup, or move to another class that's up to you. Formula 1 GT is the logical next step, models are bigger and faster, and don't require a huge jump in skill level to fly.

This years races:
Rantoul, IL in June.
Astabula, OH in August.
A west coast venue TBD in October.

Craig.

(in reply to mfuess)
       Post #: 183

RE: Sundowner from Hangar 9 - 2/14/2008 3:48:55 AM   
Bill Vargas



Posts: 1554
Joined: 1/6/2002
From: Team Coldies, CA, USA
Status: offline 		Craig, are there more than 3 USRA Sundowner Races being held in local areas around the country?


BV

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(in reply to CRG)
       Post #: 184

RE: Sundowner from Hangar 9 - 2/14/2008 4:11:27 PM   
CRG


 

Posts: 104
Joined: 6/1/2005
From: , CA, USA
Status: offline 		Bill,

There are not. At this time we run just three USRA events per year. Doesn't sound like much but they take a huge effort to organize. If clubs or other race groups were to host some local Sundowner races that would be great.

Craig.




quote:

ORIGINAL: Bill Vargas

Craig, are there more than 3 USRA Sundowner Races being held in local areas around the country?


BV


(in reply to Bill Vargas)
       Post #: 185

RE: Sundowner from Hangar 9 - 2/18/2008 6:59:50 PM   
ScaleKing


 

Posts: 20
Joined: 1/15/2007
From: Marsh HarbourAbaco, BAHAMAS
Status: offline 		Hello Everyone

Has anyone else had problems with the throtle pushrod rubbing against the roof of the cowl? I am using the evo 35 and I am having trouble with this. It is placing a bit of binding on the servo.

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Can I do this for a living???!!
IMAC# 5530

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       Post #: 186

RE: Sundowner from Hangar 9 - 2/20/2008 8:07:21 PM   
tsawyer148



Posts: 310
Joined: 3/13/2003
From: Southern, UT, USA
Status: offline 		Maybe this has been answered before but I can't find it and the search isn't doing me any good, but has anyone replaced the aluminum wingtube with a carbon fiber one? If so, where did you find one...And would it be a bad idea to do so...

Thanks in advance,

T.

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       Post #: 187

RE: Sundowner from Hangar 9 - 2/20/2008 9:57:51 PM   
ScaleKing


 

Posts: 20
Joined: 1/15/2007
From: Marsh HarbourAbaco, BAHAMAS
Status: offline 		Try this site: http://www.troybuiltmodels.com/WingTubes.htm

I don't find them to be any stronger than the aluminum tubes but they are lighter! I personally would stick with the aluminum tubes for hard everyday flying.





< Message edited by ScaleKing -- 2/25/2008 8:22:00 PM >

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Can I do this for a living???!!
IMAC# 5530

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       Post #: 188

RE: Sundowner from Hangar 9 - 6/22/2008 4:09:14 AM   
proptop



Posts: 4496
Joined: 10/18/2002
From: Rome, NY, USA
Status: online 		Guys...I'm back...and the Sundowner that I said I was building for an ole flyin' buddy? Well...it's mine now...we swapped.

I ordered a Mark 2.10 for it...and will use a Bisson Pitts muffler...

What props are you guys who are using the Moki/Mark 2.10 using?

I have a 16 X 14 APC (that we originally ordered for the YS 1.70DZ ) and a 17 X 12

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       Post #: 189

RE: Sundowner from Hangar 9 - 6/23/2008 5:24:28 AM   
vince.b


 

Posts: 240
Joined: 2/11/2002
From: Victoria , BC, CANADA
Status: offline 		i have a siato 220 in mine
the 18x10 was 7500 and was 124mph on the gps.
i used a 16x16apc tonight the static was very close to 7500 on the ground but man is it ever faster in the air.
it really unloads and sounds awesome. I never got a chance to mount the gps tonight mainly cause i left it at home .

(in reply to victorzamora)
       Post #: 190