mr.scale

My Feedback: (4)

hello, I built a 1.20 stinger (lanier) w/41cc us engine flew sluggish with zinger 18x8 and now I have a APC18x12 whitch flies alot better, but it feels heavy,rpm is 7000, and it weights a whoping 20# with fuel.
I'm thinking on changing that prop for a 20x10 Menz!
what should I do to make this airplane feel less sluggish

Thanks,
Fernando,

waynem

My Feedback: (58)

Hi mr. scale, I also have a stinger 120 with a us41 in it. I have been flying it with a zinger 18-10 prop. It flys good but not a lot of vertical. My stinger weighs 16 lbs. dry. I have been thinking of trying a 20-8 zinger. How do you like your 18-12 a.p.c. prop. Mine likes to keep flying on the 18-10 and wants to land a little hot. I would like to know if you have a problem slowing for landind with the a.p.c, Thanks Wayne

mr.scale

My Feedback: (4)

Hi waynem, I changed the prop to a pro zinger 20x10 take offs are shorter and landings are way shorter i guess that prop it has good breakin effect, on vertical it improved a little, now my rpms are 6500 on 32:1 with 92 octane, but this prop flexses a little i recomenyou to use a 20x10 std wood menz.

waynem

My Feedback: (58)

Hi, mr scale. I ordered a B and B muffler,but have not been able to try it yet. Hope to get a few more R.P.M.s from it.I dont think I can turn a 20x10 prop. I tryed a 22x6 and could not turn it. Flew better with the 18x10.If I can borrow the a 20x10 menz I will give a try and let you know. Thanks Wayne

waynem

My Feedback: (58)

Hi mr scale, After looking at my last post I realized that it might look like I wanted to borrow your prop. I have a friend that is into gas engines big time and I sometimes borrow props from him. Wayne

capin

My Feedback: (11)

I had 2 stinger 120's with us 41cc engine's and liked the 20-8 apc prop's the best, it still turned 7200 on the ground like the 18-12 apc.What a great combo!!!!!!!!!!!!!!!!!!!!!!

waynem

My Feedback: (58)

Hi Capin, Glad to hear from you about the 41 engine. I tacked my engine today and it turned a zinger 18x10 about 7020 rpm. I tryed a zinger 20x8 and turned it 6630 but with 1 lb. more pull on a fish scale. Still have not changed the muffler.Hope to get a few more rpms with that.The carb. is spitting a little bit of fuel out the velosity stack, anyone have an idear what would cause that. Thanks Wayne

waynem

My Feedback: (58)

Hi All, I flew my stinger 120 after changing the muffler to the b and b. I tacked it first and picked up 250 rpms on the 18x10 zinger and 120 rpms on the 20x8 zinger. I was suprised to find that the 18x10 pulled more vertical than the 20x8. On the fish scale the 20x8 looked the best But not in the air. I am thinking of cutting the 20x8 down to 19x8.Anyone have idears on that. Thanks wayne m.

jbflier

mr. scale; I don't think any prop is going to fix the 4lb difference between your Stinger and waynem's. Maybe a 50cc something?..............

Rocketman612

My Feedback: (85)

I'd have to agree with John. Your up near the Giant Stinger range weight wise. Any way to put it on a Diet and loose a few pounds?

If you can't lighten the airframe any then think of ditching the Wheelpants and look into CF landing gear and Lithium batteries.

fwman1

My Feedback: (22)

I found a MSC 20-8 wood prop outpulled my Pro Zinger 20-10, although I dropped a couple of hundred rpm. This was on a 46cc chainsaw conversion. This is my favorite prop for that engine. I had it on a Ryan's rebel that was heavy at 17 pounds, but still had unlimited vertical with the MSC prop. Give one a try. They are around twenty bucks.

waynem

My Feedback: (58)

Hi fwman, I read your post and see that you lost 200 rpm on a lower pitch prop, But pulled better in the air. It is strange how props pull differant. I would have though that the lower pitch would have turned more and pulled better. I guess all props perform differant. Who makes the MSC prop you talked about and what do think about cutting one inch off my 20x8 zinger. Thanks Wayne M.

handglider

My Feedback: (23)

I am also putting together a Stinger 120. and I have two different engine choices:

I can go with either a Quadra 42 or a SuperTiger 2500.

What choice would give me the best performance, vertical climb, etc....

thanks in advance...

waynem

My Feedback: (58)

Hi Handglider, I have never run or seen a SuperTiger 2500 run, but I have a s.t.90 and it has some power. Your Quadra 42 is the same as my U.S.41 I think. About 4 and 1/2 pounds of weight. I would try the super tiger first. It might out perform the Quadra. With the quadra it will be hard to keep the weight down to 16 lbs. With my us41 I had to add a 6 inch strip of lead to the tail and if I removed it I would have a nose heavy plane. If you use the Quarda think about changing the muffler, sure helped my 41 about 250 r.p.m,s. Hope this helps you. Wayne M.

mr.scale

My Feedback: (4)

Hi I changed the carb on my us 41 to a wa540, improve about 300rpms on a 20x10pro zinger,
peque!

waynem

My Feedback: (58)

Hi mr scale, I may try a wa540 carb. What is the differance between it and the standard carb. that comes with a US 41. wayne m

mr.scale

My Feedback: (4)

Hi waynem, the engine comes with a wa200 from the factory and the venturi is too small, and the wa540 is way bigger and it breaths better of course. I'll take a picture from both carbs this weeknd and i post them here, What servos are you using and how many?
Peque

waynem

My Feedback: (58)

I am using 5 hitec 605's and 1 std fut. 3003 on carb. linkage. 2 on ailerons 2 on split elavator and i on rudder. I will look for your post and may try the 540 carb. How much do they cost and where can I find it. Thanks wayne

waynem

My Feedback: (58)

Hi mr scale,Can I find the wa540 carb. on B&B website. I will look there in a few minutes to see. Wayne

mr.scale

My Feedback: (4)

Check this web site; [email protected]
Ph (320) 249-7420
I pay 18.87
good luck on your search!
Peque

davewallace

My Feedback: (29)

Hi Wayne,
The Walbro WA-200 is most likely an 11mm venturi. There is no WA-540 since Walbro's highest WA is WA-215. The WT-540 is a 13.49mm and is used on many 42cc to 50cc chain saws. You can always tell the size of Walbro's by the number in 64ths cast into the venturi. The 13.49 is a common carb and a friend has a bunch for sale on RCU cheap. Here is the add: http://www.rcuniverse.com/market/item.cfm?itemId=106854

Dave

jimcork1

My Feedback: (4)

My stinger is 18#+ and was built for the ST 3000. What a mistake that was. I put weight in the tail to balance when building then found the 3000 was a dog to fly. I switched to the Saito 1.8 and had to put 1 # of lead in the nose to balance. With the Saito 1.8 the plane will hold a hover for about 30 seconds before tail slide. I decided the gas burners were too heavy for the performance I wanted. It does fly well with the saito,, but the plane is basically HEAVY by design. Jim

waynem

My Feedback: (58)

Hi Jim, I agree with you about the performance of the saito 180, the drawback is how much fuel they burn. I have a friend with a saito 150 getting 6 or 7 flights per gallon of $15.00 fuel. I decided I could not feed it if I had it. Just joking I would like the power but it would hurt my billfold. Wayne M

jimcork1

My Feedback: (4)

Wayne I do buy fuel,, but I told the wife it is cheaper than buying a new shot gun and weekend hunting trips. It is also cheaper than spending Fri afternoon with the guys in a bar eating hot wings. , so I continue to buy Gallons of fuel with no hassle and enjoy the Saito 1.8. I like the 1.8 performance and considering the new 2.2 for a larger plane. I'm just afraid the 2.2 won't be big enough so I was looking at the Saito 3.0 twin,,

Now I wonder why the hobby shop everytime I come in. Jim

waynem

My Feedback: (58)

Jim, I have to agree with you on this one. There are a lot of things that cost more than fuel, Like not having enough power to save a plane when you need it. My us41 is to heavy and the stinger with it is 16 lbs. should not be over 14lbs. with the right engine. It flys o.k. but could sure use more power. I should just change engines and be done with it. Thanks for your post, Wayne M