H9's Sundowner

[teuchter]

That’s my one finished now and fly’s real nice; no idea of the speed, though does cover a lot of ground quickly.
I fitted the tank butted against the wing tube and used a perry blue can to feed the Moki 210, static revs are 8500 rpm’s on an apc 17 x 13" and hogs nearly 3oz fuel a minute.. ..

[Sparky69]

3 OZ a Minute! No problem! I have a race plane that will down fuel faster than An Irishman at the free beer day! (about 2 Liters in 6 minutes) From my testing you are most likely doing around 125MPH or so in level flight. Enjoy your plane. What fuel do you use and what does it weigh?
Sparky

[teuchter]

Cooler over the pond here with temps seldom over 15c so straight 80/20 methanol/castor fuel is a no no!
Fuel is 5% Duraglo supplied from here ttp://www.modeltechnics.com/glowfuel/glowfuel.html which I added extra castor.

This engine is new and I doubled up on the standard head gasket/shim for now; no ping at these revs so far’ and will try again with the extra head shim removed and perhaps a little leaner to tease out some more rpms and will wok forward to adding as much extra % nitro that I can get away with.

I am using Towerpro MG995 budget digital servo’s all round which are plenty heavy and fitted the lighter hollow tail tube.
The tank is butted against the tail tube which messed the book cog and the battery is a heavy rearward mounted 4300 4.8v Sub C Nimh weighing some 244grms/8.6oz

I’ll get the rtf weights for next post.

[teuchter]

Had to huck a shotty of scales from work; this set is calibrated and spot on! .. Dry weight 6.132 kg’s / 216.3 oz / 13.52 lbs.

[Capt.GM]

I got my SD F1 fly with Moki 210 and pitt muffler with 16 x12 APC ..this plane fly's great I also got SD 50 both fly the same characteristics its amazing ..

[nesikachad]

How are landings with the Moki?

Mine had the Evo 35 and was a tank with wings.

[proptop]

Got a Moki 2.10 in mine, with an APC 16x14 and Bisson Pitts muffler. Running on Omega 5% w/ 4oz. extra Castor...O.S. type F plug.
Flys quite well w/ the CG @ 3.25" (empty) and landings are not as bad as I'd heard/anticipated, once it finally gets slowed down. The Moki takes a little while to come down in r.p.m. and with that prop there's not much braking. It will snap if I horse it around, but ya just gotta remember not to do that.
Mine weighs around 14 1/4 RTF.

[nesikachad]

Prop,

Thanks. As far as the snapping. I've read this is a demon that lives in this airframe. One "cure" that seems to work is moving the CG forward a bit.

When you say "RTF" does that include fuel too?

[Sparky69]

Yep the cg should be 3.25 with the tank empty. If you are running the Moki you should install the hollow tubes in the tail and put the battery pack as far aft as required to balance. On mine it was on the tail hatch but it saved a lot of weight for CG adjustment. USRA Spec prop is APC 17x12 and is the fastest prop I tested last winter with the Moki before I quit testing.
Sparky

[nesikachad]

Right on.

My first one had the Evo 35 gasser and I had all the packs in the rear hatch with the steel tube to get it to hang right. Even with this, I can't help but feel I was still off on the CG. When it crashed, it snapped really hard. I didn't learn about the CG demon until later. (NOTE TO SELF: READ MORE FORUMS!!)

What muffler are you running with the Moki?
What onboard glow driver do you recommend?

[proptop]

Yep...all fueled up and ready to go...
I have one steel rod (the long one) and one alum. tube for the stab. attachment.
Got the battery just behind the wing tube...it's just an 1100 NiCd 4 cell pack so it's not all that heavy, but I suppose I could move it back to the hatch area and that might let me swap the steel rod for the other alum tube...might knock off that "extra" quarter lb.?

I'm using the std. Bisson Pitts style muffler (not the special one made for the Sundowner) because a friend had one (got it cheap) and I didn't feel like spending 80 bucks for the Sundowner spec. one. I did however cut the tips off the 2 outlet pipes.
No on board glow, but I am considering a Perry V-30 pump.

[nesikachad]

Perry pump?

Might I offer this up. Consider the Jett tank perhaps. They sound like more work to fill up but from what I've read they are dead nuts reliable when all the steps are followed. Gets rid of fuel foaming, contamination, etc which seems to be more of an issue with high speed, high G load planes. Dunno for sure, but it was a good pitch so I ordered one along with my Jett60 for my little SD50 that I've got to build.

I'm sure the Perry pump will more than suffice, but weight is weight right?