i sold that same flex wih my old seaking 3600kv engine it was to big, also i have a graupner 4mm u joint. and r u having cooling issues with that engine. my outrunner cools its self but if u didn't notic i have the front mount outrunner. .all i have to cool is the esc. i have some engines on the way first is for my brothers cracker box second is for my crackerbox and there is anothere 1700kv on the way for a airboat i like these engines if u didn't notice there cheap lights tourqeie and fast
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</p></font><table rules="groups" width="489" border="1" cellpadding="2" cellspacing="0"><colgroup><col width="93"></col></colgroup><colgroup><col width="208"></col><col width="167"></col></colgroup><tr valign="top"><td width="161" bgcolor="#cc3300" height="30">

D2830-3850</p></td><td colspan="2">Helicopter / Airplane </td></tr><tr><td colspan="3" valign="top" bgcolor="#f3f3f3" height="27"><p align="center">Specification</p></td></tr><tr valign="top"><td colspan="2" height="18">

Battery :</p></td><td width="209"><p align="right">NiCd / Nimh / LiPo Battery </p></td></tr><tr valign="top"><td colspan="2" bgcolor="#e6e6e6" height="18">

RPM/V :</p></td><td width="209" bgcolor="#e6e6e6"><p align="right">3850kv</p></td></tr><tr valign="top"><td colspan="2" height="38">

Max. efficiency current :</p></td><td width="209"><p align="right">97%</p></td></tr><tr valign="top"><td colspan="2" bgcolor="#e6e6e6" height="18">

Input Voltage </p></td><td width="209" bgcolor="#e6e6e6"><div align="right">6-22V</div></td></tr><tr valign="top"><td colspan="2" bgcolor="#e6e6e6" height="18">

Max Current </p></td><td width="209" bgcolor="#e6e6e6"><p align="right">26A</p></td></tr><tr valign="top"><td colspan="2" height="18">

Continuous Current </p></td><td width="209"><p align="right">20A</p></td></tr><tr valign="top"><td colspan="2" bgcolor="#e6e6e6" height="18">

No load Current </p></td><td width="209" bgcolor="#e6e6e6"><p align="right">0.7A</p></td></tr><tr valign="top"><td colspan="2" height="28">

Internal Resistance </p></td><td width="209"><p align="right">51mΩ</p></td></tr><tr valign="top"><td colspan="2" bgcolor="#e6e6e6" height="37">

Motor Dimensions (Diameter , Lenght)
Shaft Dimensions (Diameter , Lenght)</p></td><td width="209" bgcolor="#e6e6e6"><p align="right">26mm , 27.4mm
3mm , 14.8mm </p><p class="style33 style34"></p><p class="style33 style34" align="left"><span class="style2 style7 style32"><span class="style6 style29">Feature :</span></span></p><div class="style2" align="left"><ul>[*] Effectively the flight performanc[*]Low Price and High Quality[/list]
<span class="style6 style29">Motor Specification :</span></p></div><ul><li class="style2"><div align="left">S<span lang="EN-US"><span lang="EN-US"><span lang="EN-US"><span lang="EN-US">peed Constant: </span><span lang="EN-US">3200K</span></span></span></span>V</div><li class="style2"> <div align="left">Motor diameter: 27mm</div><li class="style2"><div align="left">Shaft diameter: 3.0mm</div><li class="style2"><div align="left"><span lang="EN-US"><span lang="EN-US"><span lang="EN-US"><span lang="EN-US">Motor length: </span><span lang="EN-US">30mm</span></span></span></span></div><li class="style2"><div align="left">Motor weight: 48Grams</div><li class="style2"><div align="left">Free load current: 17A</div><li class="style2"><div align="left">Max efficiency: 85%</div><li class="style2"><div align="left">Max current :17A</div><li class="style2"><br type="_moz"/>[/list]</td></tr></table>