tewitt1949

Being on dial up, I really don't have time to go through 25 pages to find an answer. Has anyone tried electric in a sure shark? What size motor did you use? Thanks Terry

brocja01

Terry, My Sure Shark is electric and I love it. I went to RCHotDeals.com and picked up one of there nock off brushless motor and ESC combo's for like 20 bucks and the plane flys amazingly well. The motor I'm using is a 2408-21 I believe. I have run it both on 2 and 3 cell and prefer the 3 cell in the Sure Shark.

Here are some pics.

planebuilder66

My Feedback: (8)

Lecky!, Lecky!, quick everybody start throwing stones and bottles!, maybe it'll go away! ........ No, but seriously, that's a tight fit in there, but the plane looks great.

tewitt1949

Ya I know. I'm nitro at heart but sometimes electric is more convient, less mess if I'm somplace that I have to stay cleaned up.
I think that motor is the same one I have.

Bro. Does it have much vertical?

brocja01

When you run it on a 3 cell almost unlimited. A 2 cell will get you flying but it is a lazy fly. I need to get mine out, hasn't been out all summer. All fixed up really, just need to charge and fly. It will be a spirited acrobatic plane on the 3 cell. I have the original wing on it, that Dave put dihedral in so it isn't quite as fast as some of his other ones that have the flat wing in it. I'm waiting till he releases his .15 Sure Shark kit which has the flat wing. Will be going glow for the 1st time in 3 years really.

boberos

For push rods I use .040" dia music wire
Your local piano store will sell you a lifetime supply for a buck or 2.
If the wire is used and out of an old piano, they will probably give it to you.
I like .040 better because it is stiffer than .032 also it fits the hole in the small servos perfectly with no play & no drilling needed.

Bob G

franklin_m

All,

Regrettably, my Sure Shark met it's demise this past Sunday, straight into a packed dirt road at full power from an altitude of 150 feet. Quite honestly, I've not seen an airplane hit that hard in quite a long time. Prior to impact, the airplane was responding very sluggishly to elevator inputs....acting as if it had 99.9999999% negative expo. While I enjoyed some success keeping it airborne by controlling the lift vector with aileron, something eventually let go and it bought the farm shortly thereafter.

A post mortem discovered a crapped out GWS elevator servo, internal gear failure I suspect. As sad as I was to have lost such a great flier, at least my Norvel 0.049 survived. After a very careful disassembly and cleaning, it ran strong again last night.

I'll build another I'm sure, it is simply too much fun to not do so, but I won't make the same mistake with servos again. I'll pay the slight weight penalty and use an HS-81 for the elevator, as I think there's more stress on the elevator than I first thought.

franklin_m

rainedave

My Feedback: (1)

I'm very sorry to here that. That was a beautiful covering job/color scheme. As someone here at RCU says, "All planes have expiration dates." By the time you're ready to build another I'll have the taper wing ribs cut and ready, if that's any consolation.[]

David

Digger-RCU

Frank, glad to hear that the Norvel still runs.
I have to tell you, I didnt hold out much hope.

Guys this crash was spectacular. The kind that sickens you, but you cant look away. She made a "whump" sound I have not heard before.

Frank was real guy about the whole thing. Very stiff upper lip.

Me.. I would have belly-ached all day!

I happen to know that he has another kit, and I would not expect more than a couple of weeks to pass before we see pictures of the next awsome looking plane he builds.


Digger

iflyg450

Sure Shark Build question. First let me say it is a beautifull kit! My question is my kit came with a seperate wing print. Is their a large differance in the two wings flight wise?

iflyg450

Also I was planing on using the Dubro micro push rod system (.032) and HS 56HB for the aileron/elevator/rudder. Is this a good choice for gear? Also what are good numbers for control surface throws.

iflyg450

Sure Shark Done. Engine Norvel .061, All servos Futaba S3114, and covered with microlite.
What a great plane. Should have it airborne this Sunday

Tee Bee

Looks cool. I'm ordering both sizes of SSs. Looking forward to them.

tewitt1949

I built my Sure Shark last winter but didn't fly it till 2 days ago. Man I wish I maidened it long time ago. It fly great. Very stable and fast, glides good also.

iflyg450

Is 12.94oz AUW good? I covered in in microlite. I used 3 futaba S3114, AR6100 rx, 350mah pack, Norvel .061non-rc, Have not flown it yet do you think it will be fast?

ProBroJoe

12.9 ounces ain't bad... I think mine is right around 12 ounces with a Berg 4L, a 350 mAh batt, 3 HS55's, an AP .061 and a 6 gr el-cheapo servo on the throttle. You'll find that it will fly fine and still float on landing.

Fast? Ummm, yea... it's going to be fairly quick with the Norvel .061 on there! It's been my experience that the Norvels have about 2,000 RPM over the AP .061 (on the same prop of course). For what it's worth, my AP spins an APC 5.7 X 3 at around 18,500 RPM - which makes for very spirited performance on the SS. I wouldn't worry about it though, providing your SS is built true, the CG is on, and the control surfaces are dead zero, she'll fly right from your hand with a light toss. You can always slow the Norvel down a bit for the first couple of flights by throwing on a MAS 6x3 and launching a little on the rich side.

(Check out my flight report here back on page 7 of this thread, and you'll also find a video a few posts down.)

Sweet looking SureShark BTW, I wish you luck with it!

-Joe

boberos

The ''Sure Shark'' kits just arrived, & they sure look impressive.
The balsa wood quality is way beyond expectations. Nice & light & straight grained.
No wonder this thing builds so light.
I don't know where Dave gets such good wood.
Thanks Dave

Laser cutting is very neat. I have built lots of kits but this will be my 1st with laser cut parts.

Full sheet plan with 3 pages of instructions. [We don't need no skinkin' instructions]

Gotta start gluing. See you later.

Bob

Digger-RCU

I would think that the SS with the 061 will be fast enough that you better hold on to the trans with both hands. I'm no racer, but I think they are fast even with the 049... Great looking plane by the way!


Digger

franklin_m

A tip (for what it's worth)

I posted this on the Shark XV thread, but is probably better here. This would only apply to those flying unthrottled Sharks.

The great thing about the Sure Shark is that at a full scream, it will fly right out of your hands. If you've got it trimmed for a nice power off glide, it will climb like a banshee at speed. But if you trim for level flight at high speed, it takes a fair amount of backstick as it glides in for landing (darn those aerodynamic rules!). However, I found an easy way to have the best of both.

I programmed a mix on the transmitter to feed nose down with increasing throttle stick position. I then trimmed the plane for a nice power off glide with the stick at idle. It takes a couple flights to get the mixing percentages right, but when you're done, it's fantastic!

With throttle stick all the way back (min throttle), and hand launching at full power, it climbs briskly as it leaves your hand. As it gains airspeed, just feed in increasing throttle (and hence small amounts of nose down elevator) until it's "trimmed" the way you like it. When the engine runs out of fuel and quits, then just yank the throttle stick back to idle and you're automatically trimmed for a nice smooth power off glide.

This results in a plane that's easy to "retrim" in flight without having to take your hands off the sticks to mess with trim sliders/switches.

Frank

iflyg450

I would say go with the HS-65HB they are half the weight of the HS-81 about 24oz torque and they are VERY FAST!!!! big plus is the karbonite gears.

Tee Bee

Good info, thanks. I can use that on my other 1/2A planes as well. Haven't really thought of it before.

somegeek

My Feedback: (2)

Question regarding a build using the ASP .061 engine... I will install the tank at the back of the tank area, close to the wing as possible to help minimize the CG shift as the tank empties. Going this route, should I plan to install the rudder/elevator HS55 servos fore or aft in the wing mounting bay to help with the balance?

somegeek

rainedave

My Feedback: (1)

Install the engine and tank and put on the wing. Then, holding the plane upside-down, slide the servo and battery pack around on the bottom of the wing until it balances at the back edge of the main spar. That's where to put the servo and battery. But, make sure the aileron torque rods have clearance.

David

boberos

Thanks again Dave,
Parts fit is unequalled.
Plane went together easy, well, & fast.
One concern.
It wants to balance very much rearward. ie. nose heavy.
I think I will have to put a hatch behind the wing & locate the 2/3 AAA battery there.
Is this normal?
Motor is .049 TD with Hiscott muffler & throttle.

Bob

fritzke

My Feedback: (1)

Check the latest issue of Flying Models, they are running "short kits" of the Sure Shark in partnership
with a laser cutting service (I forget who)....
Anyway, get the plans from FM ($7) and parts from their laser cutting partner.
Dave
http://www.flying-models.com/