HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Sep 15, 2014, 08:25 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,289 Posts
Discussion
Stealth Sport 20.

I finally got around to finishing this little baby & had a bit of a run with it on the weekend.
I did try it (unpainted) the previous weekend with a TFL SSS 3674 2070kv motor in it, & she went quite well on 4s with a de tongued y547 prop.

This run has a TP Power 4092 2180 motor with an m445 prop. Not as fast I don't think , & a bit less stable.
Anyway here's a couple of pics & a video.

Stealth Sport 20 Hydro. (1 min 48 sec)
785boats is offline Find More Posts by 785boats
Reply With Quote
Sign up now
to remove ads between posts
Old Sep 15, 2014, 09:24 PM
Registered User
Joined Apr 2010
873 Posts
How fast do you think she is going? Handling looks good...
Maybe a 2200kv neu 1515 motor?

Chief
BHChieftain is online now Find More Posts by BHChieftain
Reply With Quote
Old Sep 15, 2014, 10:20 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,289 Posts
I'm not sure how fast Chief. Mid 50's plus I hope.
I took the motor out of my 33" Whiplash and put it in the Stealth but it doesn't feel as fast as the Whip. Mind you I run an H7 on that. But when I tried a bigger prop on this boat, the skipping & hopping in the corners got worse.
I couldn't dial it out, without it lifting off the water in the straights.
I'll keep working on it.
785boats is offline Find More Posts by 785boats
Reply With Quote
Old Sep 19, 2014, 02:18 PM
Registered User
United States, OH, Cleveland
Joined Aug 2002
350 Posts
Try M645, worked with my Nue 1515.
JIM CALDWELLA is offline Find More Posts by JIM CALDWELLA
Reply With Quote
Old Sep 19, 2014, 03:52 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,289 Posts
Good call Jim.
I've just finished prepping an M645 for trials today.
We'll see how that goes.
I'm also going to try the H7 that works so well on my 33" Whiplash with the same motor it.

Cheers.
Paul.
785boats is offline Find More Posts by 785boats
Reply With Quote
Old Sep 24, 2014, 04:50 PM
Registered User
United States, ME, Portland
Joined Jul 2009
91 Posts
Did you adjust Cg at all between running the diff motors? If you have room to adjust your batt packs back a little with the bigger 4092 motor (and it's forward weight) it might help the stability... I know in my old pt boats a little bit to forward Cg would make it dig and darty... I'd love to see a vid looks like it's going good as is, that looks like pretty choppy water!

Couple pics of my old pt's..... Oh the memories
jmscard is offline Find More Posts by jmscard
Reply With Quote
Old Sep 24, 2014, 05:31 PM
I feel the need for speed!
scorpion1's Avatar
Southern U.S.
Joined Jun 2008
7,331 Posts
Whoa! You're going from a 2.48 to a 2.83 total pitch and she was already in the 50's? Hang on there Paul!
scorpion1 is online now Find More Posts by scorpion1
Reply With Quote
Old Sep 24, 2014, 06:45 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,289 Posts
Hi Jim.
Yep. I did try the packs back a little. Changed the rudder angle & fin angle. Strut depth & angle. All individually of course & then in combinations. Even tried a bit of extra weight in the front & went through the whole process again. Still tail hopping in the corners. It also hopped a bit with the smaller motor in it too.
A guy at the club suggested it could be that the turn fin is too big.
So I've cut one down a bit smaller & shorter to try this weekend.
I ended up with the H7 on it last weekend & she certainly was faster. And flightier too. So I put the weight back in the nose to settle her down in the straights. Worked well &the skipping settled a bit.
We'll get there. Sooner or later.

Hi Scorp.
It's good to see you treading the boards again.
Yep. I like more pitch rather than diameter sometimes. Sometimes it works sometimes it doesn't.

Cheers.
Paul.
785boats is offline Find More Posts by 785boats
Reply With Quote
Old Sep 25, 2014, 10:01 AM
Registered User
Joined Apr 2010
873 Posts
I have heard from a fellow boater that detounged props on a hydro can lead to hopping in the corners, and I did note that my 27" picklefork hydro did hop more on an m445 prop than on an x442 or x642 -- but I am personally not sure if the hop on m445 was due to detounge or just a larger diameter. I do have an x445 so I should try that sometime and note the difference... I'm skeptical but who knows...

FWIW

Chief
BHChieftain is online now Find More Posts by BHChieftain
Reply With Quote
Old Sep 25, 2014, 03:01 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,289 Posts
I guess all theories are worth checking out Chief. But I've not heard that one before.
One theory here was that it was overpowered with the 4092 motor so I've put a SSS 4074 2200kv motor in it now, & put the strut to the original setting of 1", & taken the weights out, & put the smaller fin on it.
The COG is as per instructions at between 14" & 15" from the transom. 14 & a 1/2" to be precise. And that puts it dead centre of the turn fin.
And so the process starts again.
Thanks for all the advice guys. It all helps.
Paul.
785boats is offline Find More Posts by 785boats
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion 1/2a Stealth Sport hcker2000 1/2A Planes 28 Aug 26, 2014 04:26 PM
Sold 20 APC Sport / Speed props Jaguar22 Aircraft - Fuel - Airplanes (FS/W) 1 Oct 06, 2013 10:18 AM
Sold 20 APC Speed / Sport props Jaguar22 Non R/C Items (FS/W) 2 Oct 06, 2013 10:18 AM
Sold K&B Model 5600 Sport .20 NIB. aviatortom Aircraft - Fuel - Engines and Accessories (FS/W) 1 Sep 24, 2013 05:43 PM
House of Balsa 1/2A Stealth Sport --> EP? MiL Sport Planes 8 Dec 20, 2009 12:46 PM