perfect MG

[BHChieftain]

Had a chance to run her yet?
Chief

[iop65]

No Chief , will run her this week
very hot the last few days/weeks, a lot of people swimming/playing/sailing/surfing in the lake where i "test-drive" just to dangerous
don't want troubles

[iop65]

sad to say things didn't get better ,bouncing was just the same
can not get the bouncing stopped on flat water , no fear off blow over but still bouncing
must say it was faster and riding on just a few cm hull and the prop !

changed the cog to the rear because i thought that more neg angle was the solution but it wasn't
will change the cog back to what it was at 24/07 and try again this weekend

perhaps the boat needs extra weight?
just using 2 and 3 s 4000mah and a 90a seaking
maybe some extra weight will keep it flat?

[SloHD]

Are you talking about center of gravity/balance when you say pog? Does 24/07 mean the cog is 7 inches from the transom?

[iop65]

no when i was testing on 24/07/2013 my lipo's were about 5 cm (2 inches) more to the front
going to do that again

the only way that the bouncing stopped yesterday was by moving the strut up so far (about 3-3.5mm above sponsons) that the speed was going down big time
then it runs flat but speed is gone

found out yesterday that to much neg angle made the boat "fishtailing ?" badly but doesn't stop the bouncing at all

[iop65]

ran her yesterday ,little chop
front lipo's at the back of motor
0° angle strut
strut 2,5 mm above sponsons

runs flat ,cuts through the corners like a knife ,seems it doen't mind the chop at all (no risk at blow over), seems it needs the chop to get flat

[ray schrauwen]

Squaring off the rear of the sponsons after blueprinting works well for me. Never bounces...

AQ 1800kv, AS/SF120 esc, Zippy 30C 2 x 4S 3000's, M445 for 4 min race and D/T 447 for 6 lap sprint. Strut is level with sponson bottoms and 0* flat. No wood inside with OSE CNC motor mount. Home made rudder offset + aftermarket FG cowling for weight.

[iop65]

tried something yesterday


glued (thin dubble sided tape) a 1mm plastic sheet on the end of the last step to create some lifting force

boat drives completely flat ,but speed came down a lot

did the same this morning ,but now 0.5mm plastic sheet and only 20 mm wide:still nose down but much more speed!


think i'm putting on trimtabs

i never had the need for trimtabs on my mono's ,other that adding bling-bling for the kids but i see no other way to keep this hull from bouncing on flat water

[kfxguy]

Did you ever get around to putting trim tabs on and if so what was the result?

[iop65]

yes i did
it helps but costs a lot of speed ,removed them
it just doesn't seem rigth : a cat with trimtabs