Moki 1.8
04-26-2003, 02:06 AM
#7
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Moki 1.8
Capt G,
Please tell us about that GSP mustang in your gallery, it looks good.
Things like final weight, what you thought of the kit and how she flies.
Dave
Please tell us about that GSP mustang in your gallery, it looks good.
Things like final weight, what you thought of the kit and how she flies.
Dave
04-26-2003, 02:33 AM
#8
Moki 1.8
OK, here goes. Weight is 29.5 lbs dry and power is 3W75i turning a Beila 24x12 prop at about 7000 rpm. It flys very smooth and tracks like an arrow and it's a floater on landing. I only have 7 flights so far and have not tried landing with the flaps yet. Fuse is pre-finished f-glass and foam wings. 3 Robart retracts. Did I say that it's fast?
04-27-2003, 03:01 AM
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Moki 1.8
Bob,
I see your Spit weighs 23 lbs correct?
and it flys alright for you witht the 1.80 Moki?
My Taylor is done. Final weight came in at 16 lbs.
I had to add 1 3/4 lbs to CG it, weight right around
18 lbs. I have the Moki 1.80 as well, so I should
have no probs flying it with this motor?
I was kind of worried about my wieght, but if yours is
flying fine at 23 lbs. I should be great at 18lbs!
What prop are you using?
Todd
I see your Spit weighs 23 lbs correct?
and it flys alright for you witht the 1.80 Moki?
My Taylor is done. Final weight came in at 16 lbs.
I had to add 1 3/4 lbs to CG it, weight right around
18 lbs. I have the Moki 1.80 as well, so I should
have no probs flying it with this motor?
I was kind of worried about my wieght, but if yours is
flying fine at 23 lbs. I should be great at 18lbs!
What prop are you using?
Todd
04-27-2003, 11:22 AM
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Moki 1.8
I just picked up a Yellow Spitfire and I was having the usual debate with myself of glow or gas (specifically something like a ZDZ40 or a Moki 1.8 -> 2.1).
Since you guys have run the Moki's before, how well do they like an inverted installation? I have heard lots of good things about the Moki engines. From your own experience, how reliable are they?
Thanks!
Paul
Since you guys have run the Moki's before, how well do they like an inverted installation? I have heard lots of good things about the Moki engines. From your own experience, how reliable are they?
Thanks!
Paul
04-28-2003, 01:13 AM
#16
Moki 1.8
Paul, I confess to not having as much time on my engine as I would like. But from the times its been run it has always run fine. I use a McDaniel onboard ignition to keep the plug hot at low rpm's and I use NO MORE than 5% nitro.. I think thats one of the Key issues, Nitro content. That engine was made to run on FAI fuel which is 0% nitro. Guys trying the typical15-20% fuel have problems.. Regards BobH.
04-28-2003, 01:19 AM
#17
Moki 1.8
Tempest, If I were you, having the choice of either one.. now in hindsight, I would opt for a gas engine.. let me explain. For looks you can't beat the Moki. The engine and Slimline pitts style muffler will fit entirely within the cowl with just the tip of the head protruding. Thats the good part.. the down side is the expence of operating the Big Glow engines and the limited performance. If you put a 3W 60 in the front or gas equiv. you'll have what I would term, Authority in Flight. meaning you will have the "Fighter Gusto"! Mine flies ok with the Moki but lacks the power to be impressive. These are just my observations.. your may differ lol... Regards BobH.
04-28-2003, 01:22 AM
#18
Moki 1.8
Tod, you should be fine at your weight.. and I;m using an 18x10 zinger at the moment. I had a mezlich (SP) and got a radio hit that caused my plane to do a nose dive from 6 feet on take off.... Broke the prop, ruined the spinner but the engine was still running .... lol! Since then I have returned to the wooden "cheaper" props... but Im open to suggestions... hence the thread!! lol.. Regards BobH.
04-28-2003, 02:12 PM
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BoB,
I have been flying my Yellow Spit for about 9 years now with a Moki 1.8, 5% fuel, Cline regulator, OS #8 pug NO glow driver, custom "can" exaust, very quiet. I swing an APC 18-10 at 8500??rpm. The plane weighs about 27lbs and flys like a dream. Yes, it's heavy. Does it accelerate like a fun fly plane? No it accelerates and flys like the full size. Once it accelerates to speed after climbout it has more than enough power for loops. figure eights etc. It amazes me and everone else how slow it flys and well it handles. I would love to build another, a little lighter ( it was my first real scale plane with paint) as they fly so well.
Jeremy
I have been flying my Yellow Spit for about 9 years now with a Moki 1.8, 5% fuel, Cline regulator, OS #8 pug NO glow driver, custom "can" exaust, very quiet. I swing an APC 18-10 at 8500??rpm. The plane weighs about 27lbs and flys like a dream. Yes, it's heavy. Does it accelerate like a fun fly plane? No it accelerates and flys like the full size. Once it accelerates to speed after climbout it has more than enough power for loops. figure eights etc. It amazes me and everone else how slow it flys and well it handles. I would love to build another, a little lighter ( it was my first real scale plane with paint) as they fly so well.
Jeremy
04-28-2003, 02:23 PM
#20
Moki 1.8
Jeremy, 27 lbs is still a reasonable weight for an 88 inch plane.. atleast I think it is.. As you know there isn't a lot you can do to keep the weight down on that plane... Something I did was to remove as much weight in the tail as I could.. I did that by putting lightening holes in the stab and hollowing out the counter ballances in the elevator.. The wing was glassed with the barest amount of resin... then the whole plane was painted and detailed.. I ended up adding 4 lbs to the nose to get the CG right... I haven't seen the need for the Kline Regulator in my plane but then again...I don't have a lot of time on it either...
The onboard ignition probably isn't necessary either but it gives me peace of mind lol.... if you have a picture of your spit could you post it?? thanks BobH.
The onboard ignition probably isn't necessary either but it gives me peace of mind lol.... if you have a picture of your spit could you post it?? thanks BobH.
04-28-2003, 11:52 PM
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Bob,
Here is a photo of when it was new, still looks pretty good but has a fair amount of hanger rash.
As far as the CG your right on about the tail heavyness. I only could bare to add about a pound of lead. I have not checked the CG in years but I know I was slightly aft of the recomended when I started and have done some repairs aft of the CG. I'd hate to see where it is now
. I do use a fair amount of expo to smooth things out. Just goes to show what a good flyer it is to fly with a very aft CG and have such small tail area but still flys like an old Kaos.It would fly a little better with it father forward.
Did you renforce the gear mounts? They ripped out on mind very quickly. Ended up boxing the rails to the top and bottom skins with 1/16" ply and never had another problem.
Jeremy
Here is a photo of when it was new, still looks pretty good but has a fair amount of hanger rash.
As far as the CG your right on about the tail heavyness. I only could bare to add about a pound of lead. I have not checked the CG in years but I know I was slightly aft of the recomended when I started and have done some repairs aft of the CG. I'd hate to see where it is now
. I do use a fair amount of expo to smooth things out. Just goes to show what a good flyer it is to fly with a very aft CG and have such small tail area but still flys like an old Kaos.It would fly a little better with it father forward.Did you renforce the gear mounts? They ripped out on mind very quickly. Ended up boxing the rails to the top and bottom skins with 1/16" ply and never had another problem.
Jeremy
04-29-2003, 12:32 AM
#23
Moki 1.8
We fly at 2500 ft. I run 2 moki 1.8s and the one in the P-51 uses the Master Airscrew 18x10, The one in the Yak 55 uses a Mejzlik 19x8. Both do great on FAI fuel and the one in the P-51 is inverted with no extra glow drivers. It does use an OSF plug though.
04-29-2003, 02:27 AM
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Moki 1.8 / Spitfire
I have a Dynaflight Spitfire 80" 15lbs retracts Moki 1.8 inverted .plane is eight years old with over 500 flights. 5% powermaster fuel 16x12 APC prop. Engine would occasionally loose fire on final approach when it was fairly new and ran a glow driver till it was about 1-1/2 years old. Took the glow driver off because it didn't need it after it was fully broken in. This engine runs smoother and more powerful as it gets older and will eventually get decent fuel mileage. K&B 4520 is the best plug to use. Turns 8900 on the ground and probrably over 10000 in the air on a down wind speed pass. I get a 20 minute flight on 32 oz tank. If you go gas, I'd use a BME 50 or ZDZ50. Paul 
04-29-2003, 11:03 AM
#25
Moki 1.8
Jeremy, I did reinforce the gear blocks when I built the plane. I added ply reinforcing to spread the load onto the wing over a larger area.. I see that as the one weakness in the design. My preference would be to add ribs that secure to the mounting blocks and have them extend towards the TE for about Half the cord of the wing. This would redistribute the torsonial loads on the mounts. Regards BobH.